1977 24 Hours of Le Mans: Difference between revisions

{{Short description|45th 24 Hours of Le Mans endurance race}}

The '''1977 [[24 Hours of Le Mans]]''' was the 45th Grand Prix of Endurance, and took place on 11 and 12 June 1977. The second year of the FIA [[Group 5 (racing)#4th Generation Group 5 – “Special Production Cars” (1976 to 1982)|Group 5]] and [[Group 6 (racing)|Group 6]] regulations, it produced an exciting race right up to the end.

Porsche had withdrawn from the Group 6 Championship, citing a lack of broad competition. Renault, before their move into Formula 1, decided to put its main racing focus for the year onto Le Mans. The two works teams were the pre-race favourites.

From the start the Alpine-Renaults took charge. The works Porsches mounted a brief challenge but engine issues delayed them in the pits. When [[Henri Pescarolo|Pescarolo]] retired his [[Porsche 936|936]] with engine problems, his co-driver [[Jacky Ickx]] was transferred to the sister car of [[Jürgen Barth|Barth]]/[[Hurley Haywood|Haywood]], languishing in 41st place and 15 laps behind the leaders. Ickx was given free rein to drive as hard as he dared and in an epic drive through the night, his average pace was just two seconds below qualifying pace. During the night, the French challenge started to come apart – [[Patrick Tambay|Tambay's]] car, running fourth, stopped at 3am with a dead engine. An hour later, the second car lost half an hour getting a gearbox rebuild. Then at 9am, after leading for 17 hours, the [[Jean-Pierre Jabouille|Jabouille]] and [[Derek Bell (racing driver)|Bell]] car retired with a burnt-out piston.

Suddenly, Porsche found itself in the lead. Ickx finished his marathon effort after a total of eleven hours behind the wheel. Barth and Haywood kept up his pace and when the last Renault retired just another midday with another burnt piston, they could ease off with a huge 19-lap lead over the [[Mirage (race car)|Mirage]] of [[Vern Schuppan|Schuppan]]/[[Jean-Pierre Jarier|Jarier]]. However, with only three-quarters of an hour to go, Barth pitted running on five cylinders. The mechanics treated the engine and waited, until with ten minutes to go he rolled back out onto the circuit to complete two final laps. Despite the delay, they still finished 11 laps ahead of the Mirage, the biggest winning margin of the decade. The French [[Porsche 935]] of ASA-Cacchia was third, a further 16 laps behind, with the GTP Inaltéra of owner-driver [[Jean Rondeau (racing driver)|Jean Rondeau]], and [[Alain de Cadenet]] both barely ninety seconds behind.

==Regulations==

This was the second year of the latest CSI regulations. The [[Fédération Internationale de l'Automobile|FIA]] still insisted on running dual Championships for Group 6 ([[World Sportscar Championship|World Championship for Sports Cars]]) and the World Championship for Makes for Groups 4 and 5.<ref name="Spurring 2011, p.237">Spurring 2011, p.237</ref> Group 6 allowed either a standard production engine up to 5-litre capacity or racing engines up to 3-litres (or 2.1 litres if turbo-charged). Group 5 encouraged manufacturers to adapt and modify their Touring (Group 2) and Grand Touring (Group 4) cars, including an aerodynamic silhouette body-shell.

Once again, like the year before, the [[Automobile Club de l'Ouest]] (ACO) was put off by the small championship fields and decided to run both classes together in the race. And, once again, this put them at odds with the FIA who excluded them from their championships.<ref name="Clarke 1997, p.54">Clarke 1997, p.54: Motor Sport Jul 1977</ref>

The Group 2 Touring Car class, never strongly supported, was dropped this year. However, some Class 2 cars were entered in the IMSA and Group 5 classes instead.<ref name="Spurring 2011, p.237"/> Maintaining its ties with the IMSA organisation, they accepted entries under the American GTO regulations. The ACO also took entries from their own evolved rules of the CSI system: GTP, a closed-body development of Group 6, and GTX from Group 5.

After complaints by Renault the previous year of the fuel quality which had compromised their car's race, the [[Octane rating]] was raised to 100.6, the same as that used in Formula 1. Limitations of the distance between refuelling stops were finally removed, although cars had a fuel tank maximum of 160 litres.<ref name = les24>{{Cite web | url = http://www.les24heures.fr/index.php/1977/165-1977-histoire/105-1977-Ickx-Sauve-porsche | title = 1977 Ickx Sauve Porsche | author = Thierry Chargé | publisher = www.les24heures.fr |access-date= May 9, 2012}}</ref>

After a year's abeyance, the fuel-economy trophy was restored: renamed as the Index of Energy Efficiency. A table of target fuel consumption was drawn up against average speed, and that reference figure was divided by the actual consumption. The final checks were made at the hour-22 fuel stops so that cars would not artificially benefit from slowing down at the end to conserve fuel.<ref name="Spurring 2011, p.9">Spurring 2011, p.9</ref>

==Entries==

The ACO received 88 applications, across the 7 classes with 62 arriving for qualifying on race week. The only manufacturer works teams were from Porsche and Renault, although there were entries from several small-scale racing specialists like Inaltéra, Mirage, Osella and WM. The rise of turbo-powered cars continued with them making up 23 of the 62 cars.

{|class="wikitable" style="font-size: 95%"

! Class

! Large-engines<br> >2.0L classes

! Medium-engines<br> < 2.0L classes

! Turbo engines

|-

! Group 6 S<br> Sports

| 13 / 12

| 11 / 9

| 8 / 0

|-

! Group 5 SP<br> Special Production

|8 / 8

| -

| 5

|-

! Group 4 GTS<br> Special GT

|11 / 10

| -

| 7

|-

! GTP<br> Le Mans GT Prototype

| 6 / 5

| -

| 3

|-

! GTX<br> Le Mans GT Experimental

| 1 / 1

| -

| 0

|-

! IMSA GT

| 12 / 10

| -

| 0

|-

! Total Entries

|51 / 46

| 11 / 9

| 23

|}

*<small>'''Note''': The first number is the number of arrivals, the second the number who started.</small>

===Group 6 and GTP===

The [[Martini Racing|Martini]]-Porsche works team had chosen not to contest the FIA Championship citing the lack of competition. The 1977 evolution of the [[Porsche 936]] had a more aerodynamic shell, as well as being narrower. The 2.1-litre flat-6 engine had twin KKK ([[Siemens|Kühnle, Kopp & Kausch]]) turbos and with two exhausts now it could develop 540&nbsp;bhp and get up to almost 350&nbsp;kp/h (215&nbsp;mph) when the turbo was wound up. Two cars were entered with the all-star pairing of triple-champions [[Jacky Ickx]] and [[Henri Pescarolo]] in one and [[Jürgen Barth]] paired with debutante [[Hurley Haywood]] (himself a triple Daytona 24-hours winner) in the other.<ref name="Spurring 2011, p.240-1">Spurring 2011, p.240-1</ref>

[[File:Renault Alpine A442 at LeMans 24 hours 1977.jpg|thumb|300px|right|Patrick Depailler in a Renault-Alpine A442]]

Renault-Alpine had also chosen not to run in the Championship, to make a major effort for the Le Mans win before focusing on [[Formula 1]]. Extensive work was done on the [[Renault Alpine A442|A442]]: it was lengthened to improve handling and larger, 14" front wheels fitted to allow bigger brakes. Aerodynamic testing was done on unopened ''autoroutes'' and in four separate endurance runs at the modern [[Circuit Paul Ricard]]. The test-car covered over 11,000&nbsp;km. Renault engineers found the failure of the single car last year had been the low-grade fuel used.<ref name="Clarke 1997, p.44">Clarke 1997, p.44 Motor Jun18 1977</ref><ref name="Spurring 2011, p.242">Spurring 2011, p.242</ref><ref name = les24 /><ref name="Kettlewell 1977, p.211">Kettlewell 1977, p.211</ref> The company spent FF3 million (£400,000) and sixty pit-crew were on hand to support an all-out effort.<ref name="Clarke 1997, p.44"/><ref name="Spurring 2011, p.242"/>

The driver lineup featured some of France's leading single-seater drivers with [[Jacques Laffite]] / [[Patrick Depailler]] and [[Patrick Tambay]] / [[Jean-Pierre Jaussaud]], while the third car had veterans [[Jean-Pierre Jabouille]] and [[Derek Bell (racing driver)|Derek Bell]]. In addition, Hugues de Chaunac, manager of the [[Automobiles Martini|Martini]]-Renault Formula 2 team was given the test-car as a client entry for his young drivers [[René Arnoux]] and [[Didier Pironi]].<ref name="Spurring 2011, p.242"/>

[[Mirage (race car)|Mirage]] managers Harley Cluxton and John Horsman had contemplated running the Renaults. However, in the end they instead chose to upgrade the M8 with the 490&nbsp;bhp Renault turbo engine, to replace the [[Cosworth DFV]]. [[Renault Sport]]'s director [[Gérard Larrousse]] agreed, as long as each car ran a French driver. The chassis was modified with a new airbox to cool the turbo.<ref name="Spurring 2011, p.246">Spurring 2011, p.246</ref> Team regular [[Vern Schuppan]] was paired with [[Jean-Pierre Jarier]] and American [[Sam Posey]] teamed up with [[Michel Leclère]]. Jarier was a late substitute for Jean-Louis Lafosse who had not arrived with promised sponsorship money, which gave the lawyers work to argue in court.<ref name="Clarke 1997, p.49-50">Clarke 1997, p.49-50 Autosport Jun16 1977</ref>

[[Alain de Cadenet]], with his regular co-driver [[Chris Craft (racing driver)|Chris Craft]], returned with their latest modified version of the Lola T380, the LM77. The rear wing of the car patriotically celebrating the Queen's [[Silver Jubilee of Elizabeth II|Silver Jubilee]]. Once again they did their habit of arriving, and preparing the car, at the last minute in the paddock.<ref name="Clarke 1997, p.46">Clarke 1997, p.46 Motor Jun18 1977</ref><ref name="Clarke 1997, p.49-50"/> Their car from the previous year was bought by Simon Phillips of the Dorset Racing Associates team and was co-entered with de Cadenet.<ref name="Spurring 2011, p.252">Spurring 2011, p.252</ref> French privateer, Xavier Lapeyre, again entered his Lola T286.<ref name="Spurring 2011, p.226">Spurring 2011, p.226</ref>

[[File:1977 Inaltera LM built by Rondeau, Ford V8 Cosworth, 2993cc 460hp 330kmh photo 2.jpg|thumb|300px|right|Jean Rondeau's Inaltéra LM77]]

Le Mans local [[Jean Rondeau (racing driver)|Jean Rondeau]]'s team had had an excellent debut the previous year winning the new GTP class. This year, three cars were entered – still bearing the name of their sponsor, French home-furnishings company Inaltéra. One stayed in the GTP class (driven by Rondeau himself, with [[Jean Ragnotti]]) while the other two were lightened by 95&nbsp;kg and modified to run in the Group 6 class. French Formula 1 veteran [[Jean-Pierre Beltoise]] drove one with American [[Al Holbert]] and the other had the all-female pairing of Italian [[Lella Lombardi]] with Belgian [[Christine Beckers]].<ref name="Spurring 2011, p.248">Spurring 2011, p.248</ref><ref name="Clarke 1997, p.49-50"/>

Former [[Peugeot]] staff Gérard Welter and Michel Meunier were back with their [[Welter Racing|WM]] P76 in GTP class. The [[V6 PRV engine|Peugeot 2.7-litre V6 engine]] put out 250&nbsp;bhp. They also completed a second P77 chassis, this time fitted with a KKK turbo that increased the power output to a far more competitive 380&nbsp;bhp.<ref name="Spurring 2011, p.255">Spurring 2011, p.255</ref> Another all-French entry was Bernard Decure's modified [[Alpine A310]], fitted with the V6 PRV engine.<ref name="Spurring 2011, p.262">Spurring 2011, p.262</ref> Another GTP entry saw the return to Le Mans of Aston Martin. Entered by Englishman Robin Hamilton, his [[Aston Martin DBS V8|DBS V8]] had progressively been modified to meet Group 4 and Group 5 regulations. The 5.3-litre V8, with its extensive modifications, put out 510&nbsp;bhp and got the car up to 300&nbsp;kp/h (188&nbsp;mph). Being the heaviest car in the field, the French fans nick-named it ''le petit camion'' ("little lorry") and the ACO allowed him to switch across to the GTP class. Hamilton was joined by his regular co-driver David Preece along with [[Mike Salmon (racing driver)|Mike Salmon]], who had been one of the drivers of the last Aston Martin entry, back in [[1964 24 Hours of Le Mans|1964]].<ref name="Spurring 2011, p.265">Spurring 2011, p.265</ref>

French rally driver Robert Neyret ran his [[Lancia Stratos]] again in the GTP class, the 2.4-litre Ferrari V6 modified with a KKK-turbo. This year female driver Christine Dacremont was partnered with Marianne Hoepfner.<ref name="Spurring 2011, p.262">Spurring 2011, p.262</ref>

===Group 6 (2-litre)===

The under-2000 class was spiced up with new manufacturers entering what had been a [[Lola Cars|Lola]] versus [[Chevron Cars Ltd|Chevron]] battle, and there was a good 11-strong field. The class encouraged mixing the chassis with a choice of engine. The French engine-builder, Société ROC, had three of the latest B36 Chevrons (the lightest cars in the race<ref name="Clarke 1997, p.49-50"/>) while the British Chandler-Ibec team ran a Chevron-Ford. Their compatriots Dorset Racing had a Lola-Ford as did the Swiss GVEA team while French privateer Jean-Marie Lemerle had a Lola-ROC combination.

Having moved on from [[Formula Two]], [[Osella]] had been the leading 2-litre marque in the World Championship, often running second to the 3-litre Alfa Romeos. One of the FA5 works cars was entered, with its 2-litre BMW engine. [[Enzo Osella]] replaced his usual driving line-up for the race with [[Alain Cudini]], Raymond Touroul and Anna Cambiaghi.<ref name="Spurring 2011, p.259">Spurring 2011, p.259</ref>

[[Peter Sauber]]'s little Swiss outfit had built a small number of monocoques for hill-climbing. He was now looking at circuit racing with the C5, also powered by the BMW engine. [[Herbert Müller (racing driver)|Herbert Müller]] had won the 1976 [[Interserie]] trophy with it and now they looked to Le Mans. It would be driven by fellow Swiss Eugen Strähl and Peter Barnhard.<ref name="Spurring 2011, p.258">Spurring 2011, p.258</ref> The other entries were two from another small Swiss manufacturer, Cheetah. Charles Graemiger had a new BMW-powered G601 for privateer Daniel Brillat, while the older G501-Cosworth was prepared for Inaltéra owner André Chevalley.<ref name="Spurring 2011, p.260">Spurring 2011, p.260</ref>

===Group 5 and GTX===

[[File:Martini Porsche 41 246.jpg|thumb|300px|right|Stommelen/Schurti works Porsche 935-77]]

Porsche had been dominating the World Championship winning every round against sporadic competition from BMW, who were concentrating on the [[Deutsche Rennsport Meisterschaft|DRM championship]] in Germany. This year, Porsche built 13 of the [[Porsche 935|935]] for general sale, at £35,000 each.<ref name="Kettlewell 1977, p.215">Kettlewell 1977, p.215</ref><ref name="Spurring 2011, p.250-1">Spurring 2011, p.250-1</ref> So the Group 5 entry list was the sole preserve of Porsche.

For Le Mans, the Martini-Porsche works team entered their Championship car, the 935/77 iteration. Engineer [[Norbert Singer]] had tweaked the aerodynamics and trimmed more weight. The single turbo was replaced by two smaller KKK-turbos that reduced the throttle-lag and lifted the output a bit, to 630&nbsp;bhp. This propelled the car down the Mulsanne straight at 323&nbsp;kp/h (201&nbsp;mph). With Ickx running the 936 and Jochen Mass no longer doing 24-hour events, driving duties were handed, once again, to the other team drivers [[Rolf Stommelen]] and [[Manfred Schurti]].<ref name="Spurring 2011, p.249">Spurring 2011, p.249</ref>

Three customer teams entered their 1976-spec cars. Georg Loos had two cars for [[Klaus Ludwig]]/[[Toine Hezemans]] and [[Tim Schenken]]/[[Hans Heyer]] (current DRM champion). The French JMS Racing team car was prepared by Henri Cachia for [[Claude Ballot-Léna]] with American champion [[Peter Gregg (racing driver)|Peter Gregg]]. The [[Kremer Racing|Kremer brothers]] modified their car further, with more weight-saving and aerodynamic additions. The K2 would be driven by Brits [[John Fitzpatrick (racing driver)|John Fitzpatrick]], [[Nick Faure]] and [[Guy Edwards]].<ref name="Spurring 2011, p.250-1"/><ref name="Clarke 1997, p.49-50"/> The other entrants in Group 5 were privateers with modified Porsche 911s or 934 turbos. The sole taker of the Le Mans GTX regulations was a modified 3-litre Porsche Carrera RS entered by the Swiss Porsche Club Romand.

===Group 4 and IMSA GT===

[[File:Concours élégance Villa Este 54.JPG|thumb|300px|right|This year's BMW “Art-car”, painted by Roy Lichtenstein]]

Like the Group 5 entry list, the Group 4 class was a Porsche benefit and the ten entries were a mix of 934 turbos (480&nbsp;bhp) and 911 Carreras (340&nbsp;bhp). However, a multinational list added interest, with the German Kremer team and French JMS Racing team backing up their group 5 entries, taking on the Spanish Escuderia Montjuich and the two cars of the Swiss Schiller Racing team.

BMW had reduced their participation in Group 5 racing, with the works team changing from the [[BMW E9|3.0 CSL]], to running the new [[BMW 3 Series (E21)|320i]] in Group 2 racing.<ref name="Spurring 2011, p.254">Spurring 2011, p.254</ref><ref name="Wimpffen 2007, p.226">Wimpffen 2007, p.226</ref> With Group 2 no longer an option at Le Mans, the cars were instead allowed into the IMSA-GT category. The Belgian Luigi Racing team (current holders of the [[European Touring Car Championship]]) entered two BMW 3.0 CSLs, one for champions [[Pierre Dieudonné]] and Jean Xhenceval, with Spartaco Dini, and the other for Eddy Joosen and Claude de Wael with [[Tom Walkinshaw]] brought in. They travelled straight from [[Brno]], where they had raced the weekend before in the ETCC.<ref name="Spurring 2011, p.253">Spurring 2011, p.253</ref>

Recent efforts by the ACO to draw Le Mans and American road-racing closer together did not bear any fruit this year, with no NASCAR or super-modified IMSA cars entered.<ref name="Clarke 1997, p.45">Clarke 1997, p.45 Motor Jun18 1977</ref> Auctioneer and gentleman driver [[Hervé Poulain]]'s latest [[BMW Art Car]] was painted this year by American [[Roy Lichtenstein]]. The 320i model was dominating the 2-litre class in the ETCC, but despite superior handling, its 300&nbsp;bhp was left behind in the IMSA one-engine size class.<ref name="Spurring 2011, p.254"/> Nevertheless, Poulain enjoyed strong [[BMW M|BMW]] backing from [[Jochen Neerpasch]] and a factory pit-crew.<ref name=les24/>

After the argument on the startline between [[North American Racing Team|NART]] and ACO at the [[1975 24 Hours of Le Mans|1975 race]] there had been no Ferrari presence at the race last year. However, NART returned this year, running a [[Ferrari Berlinetta Boxer#365 GT4 BB|Ferrari 365 BB]] last raced at the [[1975 12 Hours of Sebring]]. It would be driven by Frenchmen, and former Ferrari privateers, Lucien Guitteny and François Migault.<ref name="Spurring 2011, p.261">Spurring 2011, p.261</ref><ref name="Clarke 1997, p.45"/>

==Practice and Qualifying==

Once again there were two days of formal practice, on Wednesday and Thursday, running from 6pm to midnight.

The first evening was virtually washed out by rain with few teams choosing to get out onto the circuit.<ref name="Spurring 2011, p.237">Spurring 2011, p.237</ref><ref name="Clarke 1997, p.49-50"/> Manfred Schurti, in the Group 5 Martini-Porsche was surprisingly fastest ahead of the Group 6 cars.<ref name="Clarke 1997, p.54"/> On the Thursday, Jean-Pierre Jabouille took pole position with a new lap record of 3:31.7, over a second faster than his pole time in 1976, with his stablemate Laffite in second. Ickx got his Porsche into third, a full seven seconds faster than his qualifying-time from the year before.<ref name="Spurring 2011, p.240-1"/> Next were the other two Renaults, while Ickx's teammate Stommelen, got the 935 into sixth as the fastest Group 5 car. The two Loos Porsches were behind the works teams in 8th and 9th, while the Lapeyre Lola rounded out the top-10 ahead of the two Mirages. Horsman had found his cars were lacking top-end speed (almost 30&nbsp;kp/h (20&nbsp;mph) slower than their fellow Renaults<ref name="Clarke 1997, p.44"/>) and the drivers complaining of feeling their helmets sucked up toward the airscoop.<ref name="Clarke 1997, p.49-50"/> Beltoise qualified the uprated Inaltéra in 13th, fully 9 seconds faster than he did the year before with the same chassis.<ref name="Spurring 2011, p.248"/>

Eighteen cars broke the 4-minute barrier this year, compared to only twelve the previous year.<ref name="Clarke 1997, p.49-50"/> These included the leading GT car, the Kremer Porsche of Bob Wollek (17th), and the Osella (18th) as the fastest of the 2-litre Group 6 field – both ahead of Rondeau's Inaltéra GTP (20th with 4:00.7). The Ravenel brothers' BMW was the fastest IMSA entry in 36th (4:21.7), while the Aston Martin was the last qualifier (4:31.8). It only made the start-line as Jean-Louis Chateau's Porsche 935 got bumped as he had not been able to qualify his co-drivers.<ref name="Clarke 1997, p.49-50"/> Among the non-qualifiers was the new Cheetah, where considerable problems stopped it setting a time.<ref name="Spurring 2011, p.267">Spurring 2011, p.267</ref> The Dorset Racing team, running the second De Cadenet, also did not run. On Wednesday night, their French translator had been showering at the track medical centre when toxic fumes caused him to collapse. He was rushed to hospital but never regained consciousness and died the following day.<ref name="Clarke 1997, p.45"/>

===Start===

Race-day was cool and blustery.<ref name="Clarke 1997, p.49-50"/> The honorary starter this year was Pierre Ugeux, President of the CSI.<ref name="Spurring 2011, p.236">Spurring 2011, p.236</ref> Jabouille took the lead from the rolling start. Pironi, fulfilling his potential role as the 'hare', vaulted straight up to second. However, after running the equivalent of almost two Le Mans in preparation, the Renault test-car could not even complete one lap in the race. At the end of the Hunaudières straight, an oil-line split in Pironi's engine starting a major fire. He got to the Mulsanne firepost and got out uninjured.<ref name="Spurring 2011, p.244">Spurring 2011, p.244</ref><ref name="Clarke 1997, p.44"/> At the end of the first lap it was Jabouille leading the 935 of Stommelen, then Ickx, Laffite and Tambay.<ref name="Spurring 2011, p.239">Spurring 2011, p.239</ref><ref name="Clarke 1997, p.54"/>

It was a busy first hour in the pits. Rondeau needed the clutch adjusted on his GTP car and Klaus Ludwig's Gelo 935 blew its engine after just 4 laps.<ref name="Clarke 1997, p.51">Clarke 1997, p.51 Autosport Jun16 1977</ref><ref name="Spurring 2011, p.250-1"/> Chris Craft brought the De Cadenet in with a dodgy clutch, losing nine minutes.<ref name="Spurring 2011, p.252"/><ref name="Clarke 1997, p.46"/> Then after 8 laps, Stommelen was in the pits with his car suffering from a loose [[Rocker arm|rocker shaft]] and losing oil. Dropping three laps, he had to cruise for 16 laps before being allowed to top up with oil, but the damage had been done and they retired before nightfall. Things got worse for Porsche when the Barth/Haywood car was stopped for 20 minutes with a faulty fuel pump then another 30 minutes with a blown head gasket, dropping them to 41st.<ref name="Clausager 1982, p.170-2">Clausager 1982, p.170-2</ref><ref name="Clarke 1997, p.42-3">Clarke 1997, p.42-3 Motor Jun18 1977</ref><ref name="Clarke 1997, p.54"/>

Soon after the first fuel-stops, on lap 15, Fitzpatrick brought the Kremer 935 crawling into the pits, It had been running 8th and the last car on the lead lap.<ref name="Clarke 1997, p.51"/> It was retired with burnt out cylinder-liners. The better fuel economy of the Porsches was soon apparent with the Renaults refuelling after 18-19 laps, while Ickx/Pescarolo managed 23 laps.<ref name="Clarke 1997, p.55">Clarke 1997, p.55: Motor Sport Jul 1977</ref> After two hours, Jabouille, Ickx and Laffite had done 31 laps, Tambay fourth a lap behind. Another lap back were the Mirages, the remaining Gelo 935 and Beltoise in the Inaltéra. Over half the 2-litre field had had mechanical issues but the class-leading Osella was running well in 12th overall.<ref name="Clarke 1997, p.51"/>

In the fourth hour, the de Cadenet lost time in the pits suffering overheating from being run too lean, dropping down to 22nd.<ref name="Clarke 1997, p.51"/> Then shortly before 8pm, Pescarolo was duelling for the lead with Jabouille who had just pitted. Pulling out of Indianapolis and racing toward Arnage, he over-revved the engine and broke a conrod, generating a long smoke trail and forcing the car's retirement.<ref name="Clarke 1997, p.55"/><ref name="Spurring 2011, p.240-1"/> This left the Renaults running 1-2-3 again, several laps ahead of the Mirages. The Porsche team transferred Ickx, their premier driver, to the other 936 in the forlorn hope that it could get back up the field for a podium place.<ref name="Clausager 1982, p.170-2"/> It was now 15 laps behind the leaders.<ref name="Clarke 1997, p.51"/>

So at 8pm, after four hours, Jaussaud/Bell had done 62 laps, a lap ahead of their team-mates. Fourth, two laps back, was now the Ludwig/Hezemans Gelo Porsche ahead of the two Mirages and the Beltoise/ Holbert Inaltéra. The French 935 was 8th (56) and second in class, the GTP Inaltéra ninth. The Schiller Racing Porsche of Haldi/Vetsch was tenth (55) leading the GTs, the Sauber in 13th now led the 2-litre class (after the Osella was delayed) while the Béguin 911 had moved up from 39th to 19th to lead the IMSA class.<ref name="Clarke 1997, p.53"/>

At dusk the Posey/Leclère Mirage, running sixth, stuttered to a halt. Unbeknownst to the team, the fuel pump had sprung a leak and the tank had run dry. An hour later, the sister car, then running third pitted with its alternator bouncing around its engine bay, which cost it two places.<ref name="Spurring 2011, p.246"/><ref name="Clarke 1997, p.55"/>

===Night===

At the 9pm fuel stops, Beltoise's Inaltéra was getting refuelled when the hose detached, pouring fuel into the cockpit. He got out without incident and the liquid was mopped up. However, a stray spark ignited the fumes and started a flash fire. Fortunately the damage was light, but it took seventy minutes to get the car going again and by then it had fallen from fifth to fifteenth.<ref name="Spurring 2011, p.248"/><ref name="Clarke 1997, p.55"/> The Porsche works team was in tatters, with just the one car left, languishing in the bottom half of the field. Ickx was told to win the race, or break the car trying.<ref name="Spurring 2011, p.240-1"/> By 9pm they had got back up to ninth.

Given such free rein, Ickx put in an incredible stint, at times pulling in the leaders at over ten seconds a lap. Over the next thirteen hours, Barth and Haywood only drove one shift each as Ickx did his epic drive through the night, the equivalent of five F1 ''Grands Prix''. Breaking the lap record over and over again, his average lap-time in the dark was only two seconds slower than qualifying pace.<ref name="Spurring 2011, p.240-1"/><ref name="Clarke 1997, p.42-3"/><ref name="Laban 2001, p.181">Laban 2001, p.181</ref> From being 41st after two hours, by 9pm he had got the car back up to ninth, and by midnight up to fifth, behind the three Alpine-Renaults (Jaussaud/Bell having done 123 laps) and the Loos Porsche (117). The remaining Mirage was sixth (114), ahead of the Cachia 935 (112), the Schiller Porsche (110), the De Cadenet back up to ninth and the women's Inaltéra in tenth (109).<ref name="Clausager 1982, p.170-2"/><ref name="Clarke 1997, p.53">Clarke 1997, p.53 Autosport Jun16 1977</ref>

Then things started unravelling for Renault. Coming up to 3am, Tambay's engine died with no oil pressure, when approaching Indianapolis.<ref name="Spurring 2011, p.244"/><ref name="Clarke 1997, p.55"/> At the halfway mark, 4am, the leading Renault had completed 185 laps, averaging just over 15 laps an hour. The second Renault was two laps back and still four laps ahead of Ickx. The Loos 935 was comfortable in fourth (175), ahead of the Mirage (171), the De Cadenet (170) and the Cachia 935 (167 laps). An hour later, the Laffite/Depailler car was parked for over 30 minutes to rebuild its gearbox.<ref name="Clausager 1982, p.170-2"/><ref name="Clarke 1997, p.51"/><ref name="Kettlewell 1977, p.212">Kettlewell 1977, p.212</ref><ref name="Clarke 1997, p.55"/> This put the Ickx/Barth/Haywood Porsche up into second place having made back 9 of the 15 laps from the leading Renault.

The large number of mechanical issues had spread out the field. The GTP Inaltéra was well back in 8th (172), while the ROC Chevron leading the 2-litre class broke into the top-10 (171) and about to overtake the marooned third Renault. After the first Schiller Porsche had retired, the other team car had taken over the lead of Group 4 and was running 11th overall, until they too fell out with engine issues less than two hours later.<ref name="Clarke 1997, p.53"/><ref name="Clarke 1997, p.51"/> The IMSA class had been a close race through the night with four successive leaders: the Béguin and Cachia Porsches, the remaining Luigi BMW then the Charles Ivey Porsche leading into the new day.

===Morning===

As dawn broke a heavy rain shower swept the track, catching out many drivers.<ref name="Clarke 1997, p.42-3"/> That included the leader Jabouille who had a huge spin at the Ford Chicane and was fortunate not to hit anything.<ref name="Spurring 2011, p.244"/> Another was Chris Craft, who aquaplaned off. It took an hour to repair the brakes and front end of the De Cadenet, dropping them to ninth.<ref name="Clarke 1997, p.46"/><ref name="Spurring 2011, p.252"/><ref name="Clarke 1997, p.55"/> The Sauber that had been running well, second in class and tenth overall, retired with a broken gearbox.<ref name="Spurring 2011, p.258"/> Such was the spread of the field by now that, at 6am, the gap between first and tenth had grown to 41 laps.<ref name="Clarke 1997, p.52">Clarke 1997, p.52 Autosport Jun16 1977</ref>

Ickx's marathon effort finally finished at 9.10am, having driven the maximum allowable time for a driver. He handed the car back to the equally fast Barth,<ref name="Spurring 2011, p.240-1"/> Minutes later, the French spectators were stunned when the engine of Jabouille's Alpine-Renault blew up in a cloud of smoke going down the Hunaudières straight. He limped round to the pit, but after leading for over 17 hours, the car was retired with a broken piston. That meant the Porsche was now leading, two laps ahead of the much-delayed Laffite/Depailler car, having also driven back through the field. The Frenchmen pressed hard to make up the gap, pulling a lap back on the Porsche, and only six minutes behind.<ref name="Spurring 2011, p.244"/>

The Gelo Porsche had been comfortably holding down fourth through the night and into the morning. Just before 11am, now up to third, it came to the pits smoking. The pitcrew changed the turbo in just twelve minutes but more stops never fixed the problems and the engine stopped the car out on the track an hour later.<ref name="Spurring 2011, p.250-1"/><ref name="Clarke 1997, p.52"/>

===Finish and post-race===

[[Image:Porsche 93677 Spider.jpg|thumb|200px|#4 Porsche 936/77-001, Le Mans winner 1977]]

A disastrous race for Renault ended just before midday when the remaining car also stopped out of Indianapolis with another broken piston.<ref name="Spurring 2011, p.244"/><ref name="Clarke 1997, p.55"/> This left the Porsche (294 laps) with a huge 16-lap over the Schuppan/Jarier Mirage (278). Third, a long way back, was Rondeau's Inaltéra (262), then the ASA Cachia Porsche (260), and the rapidly closing De Cadenet (257), none of whom had overtaken the stopped Loos car.<ref name="Clarke 1997, p.53"/> There were just 23 cars left running.

In the blazing afternoon heat, Barth and Haywood dropped their lap times by over fifteen seconds. However, what could have been a steady cruise to the finish became a major drama when Haywood coasted into the pits with less than an hour to go, with smoke trailing from the Porsche. It was another holed piston. The mechanics disconnected the turbos, isolated the faulty cylinder and told Barth to wait.<ref name="Spurring 2011, p.240-1"/><ref name="Clausager 1982, p.170-2"/><ref name="Clarke 1997, p.53"/> Meanwhile, after being delayed earlier in the afternoon the Inaltéra had dropped to fourth, but now both they and Craft were reeling in the French 935, all getting onto the same lap going into the final hour.<ref name="Spurring 2011, p.252"/><ref name="Clarke 1997, p.55"/>

With ten minutes to go and having lost 5 laps, Barth slowly eased back onto the track with a clock strapped to the steering wheel to carefully monitor the remaining time. The regulations were that a car had to complete the final lap within a certain percentage of the previous lap.<ref name="Clarke 1997, p.55"/><ref name="Laban 2001, p.181"/> Barth completed two careful laps to limp to an improbable victory, their sizeable lead over the Mirage trimmed to eleven laps – still the biggest winning margin for the decade. In the end third (a distant sixteen laps further back) went to the Porsche 935 of Claude Ballot-Léna and Peter Gregg, as Group 5 winners. The final margin was just 40 seconds ahead of Jean Rondeau's GTP-winning Inaltéra and 90 seconds to Chris Craft (who had done most of the driving) in the De Cadenet.<ref name="Clausager 1982, p.170-2"/><ref name="Clarke 1997, p.46"/><ref name="Clarke 1997, p.55"/>

In a battle of attrition, the only finisher in the Group 6 2-litre class was the Pignard/Dufrène/Henry Chevron-ROC. The Dorset Racing Lola had overheated early on, and then been bedevilled by gearbox and suspension issues throughout the race and although it did finally get to the finish, it could not be classified having only covered 213 laps.<ref name="Clarke 1997, p.53"/><ref name="Spurring 2011, p.257">Spurring 2011, p.257</ref> Bob Wollek vindicated his decision to drive the Kremer Porsche by finishing 7th as Group 4 class-winner, by 17 laps. It had not been an easy victory for them, replacing the universal joint, and steering and suspension issues.<ref name="Spurring 2011, p.256">Spurring 2011, p.256</ref> Eighth was the Luigi Racing BMW of Dieudonné/Xhenceval/Dini. Around midnight they had lost time fixing the gearbox but took the IMSA class victory ahead of the Porsches.<ref name="Spurring 2011, p.253"/> Ninth, and second in class was Hervé Poulain's BMW Art Car after a very reliable run.<ref name="Spurring 2011, p.254"/>

Both the Ferrari and Aston Martin finished (16th and 17th respectively) after spending most of the race chasing each other.

By some fortuitous luck, the Mirage team had survived. They had not got the maximum-speed testing in the US needed for simulating the long straights of Le Mans. Thereby unable to tweak the aerodynamics, they soon had found their cars were not getting sufficient airflow onto the turbos. This meant the cars were running very fuel-rich and consuming about 20% more fuel than the works cars. Which, in turn, ran their engines cooler and protected the pistons enough from burning out. The same had happened the year before, but the Renault technicians had put it down to the fuel used.<ref name="Clarke 1997, p.44"/><ref name="Spurring 2011, p.246"/>

Soon after the race, Charles James left Inaltéra as chairman. The new board wanted to be out of motorsport and sold the cars. Jean Rondeau could not afford to buy them, and instead they were sold to Swiss race-engine specialist Heini Mader.<ref name="Spurring 2011, p.248"/>

It was appropriate that one of Jacky Ickx's greatest drives, a full eleven hours, would give him his fourth victory, equalling the record held by [[Olivier Gendebien]] who was on hand to witness his Belgian compatriot's feat.<ref name="Clarke 1997, p.42-3"/>

=== Finishers===

Results taken from Quentin Spurring's book, officially licensed by the [[Automobile Club de l'Ouest|ACO]]<ref name="Spurring 2011, p.2">Spurring 2011, p.2</ref><ref name="Spurring 2011, p.236">Spurring 2011, p.236</ref><ref name="Spurring 2011, p.268">Spurring 2011, p.268</ref><ref>{{Cite web|url=http://www.racingsportscars.com/race/Le_Mans-1977-06-12.html|title= Racing Sports Cars|website= RacingSportsCars.com|access-date=2021-07-01}}</ref> Class Winners are in '''Bold''' text

! {{Tooltip|Pos|Position}}

! Class

! {{Tooltip|No.|Car number}}

! Team

! Drivers

! Tyre

! {{Tooltip|Laps|Laps completed}}

|-

! '''1'''

| '''Gr.6<br>S 3.0'''

| '''4'''

| '''{{flagicon|FRG}} [[Martini Racing]] [[Porsche in motorsport|Porsche System]]'''

| '''{{flagicon|FRG}} [[Jürgen Barth]]<br>{{flagicon|USA}} [[Hurley Haywood]]<br>{{flagicon|BEL}} [[Jacky Ickx]]'''

| [[Porsche 936|Porsche 936-77]]

| Porsche 911/78 2.1L F6 ''twin-turbo''

| {{Dunlop}}

| 342

! 2

| Gr.6<br>S 3.0

| 10

| {{flagicon|USA}} Grand Touring Cars Inc

| {{flagicon|AUS}} [[Vern Schuppan]]<br>{{flagicon|FRA}} [[Jean-Pierre Jarier]]

| [[Mirage (race car)#M8|Mirage M8]]

| Renault 1997cc V6 ''turbo''

| {{Goodyear}}

| 331

! '''3'''

| '''Gr.5<br>SP'''

| '''40'''

| '''{{flagicon|FRA}} JMS Racing <br>{{flagicon|FRA}} ASA Cachia'''

| '''{{flagicon|FRA}} [[Claude Ballot-Léna]]<br>{{flagicon|USA}} [[Peter Gregg (racing driver)|Peter Gregg]] '''

| Porsche 2.9L F6 ''turbo''

| {{Dunlop}}

| 315

! '''4'''

| '''GTP'''

| '''88'''

| '''{{flagicon|FRA}} Inaltéra '''

| '''{{flagicon|FRA}} [[Jean Rondeau (racing driver)|Jean Rondeau]]<br>{{flagicon|FRA}} [[Jean Ragnotti]]'''

| [[Inaltera GTP|Inaltéra LM77]]

| [[Cosworth DFV]] 3.0L V8

| {{Goodyear}}

| 315

|-

! 5

| Gr.6<br>S 3.0

| 5

| {{flagicon|GBR}} A. de Cadenet<br>''(private entrant)''

| {{flagicon|GBR}} [[Alain de Cadenet]]<br>{{flagicon|GBR}} [[Chris Craft (racing driver)|Chris Craft]]

| De Cadenet-[[Lola Racing Cars|Lola]] LM77

| [[Cosworth DFV]] 3.0L V8

| {{Goodyear}}

| 315

! '''6'''

| '''Gr.6<br>S 2.0'''

| '''26'''

| '''{{flagicon|FRA}} Société Racing Organisation<br> Course'''

| '''{{flagicon|FRA}} Michel Pignard<br>{{flagicon|FRA}} Albert Dufrène<br>{{flagicon|FRA}} [[Jacques Henry]] '''

| [[Simca]]-ROC 1996cc S4

| {{Goodyear}}

| 303

|-

! '''7'''

| '''Gr.4<br>GT'''

| '''58'''

| '''{{flagicon|FRG}} Porsche [[Kremer Racing]] '''

| '''{{flagicon|FRA}} [[Bob Wollek]]<br>{{flagicon|BEL}} "Steve” (Jean-Pierre Wielemans)<br>{{flagicon|FRA}} [[Philippe Gurdjian]]'''

| Porsche 3.0L F6 ''turbo''

| {{Goodyear}}

| 298

|-

! '''8'''

| '''IMSA<br> GT'''

| '''71'''

| '''{{flagicon|BEL}} Luigi Racing'''

| '''{{flagicon|BEL}} [[Pierre Dieudonné]]<br>{{flagicon|BEL}} Jean Xhenceval<br>{{flagicon|ITA}} Spartaco Dini'''

| [[BMW M30]] 3.2L S6

| {{Dunlop}}

| 291

|-

! 9

| IMSA<br> GT

| 50

| {{flagicon|FRA}} H. Poulain<br>''(private entrant)''

| {{flagicon|FRA}} [[Hervé Poulain]]<br>{{flagicon|FRA}} [[Marcel Mignot]]

| [[BMW M10|BMW M12]] 1991cc S4

| {{Goodyear}}

| 287

! 10

| IMSA<br> GT

| 61

| {{flagicon|FRA}} C. Gouttepifre<br>''(private entrant)''

| {{flagicon|FRA}} Christian Gouttepifre<br>{{flagicon|FRA}} Philippe Malbran<br>{{flagicon|FRA}} Alain Leroux

| [[Porsche 911#911 Carrera RS (1973 and 1974)|Porsche 911 Carrera RS]]

| Porsche 3.0L F6

| {{Dunlop}}

| 281

! 11

| Gr.6<br>S 3.0

| 2

| {{flagicon|FRA}} Inaltéra

| {{flagicon|ITA}} [[Lella Lombardi]]<br>{{flagicon|BEL}} [[Christine Beckers]]

| [[Inaltera GTP|Inaltéra LM77]]

| Cosworth DFV 3.0L V8

| {{Goodyear}}

| 279

! 12

| IMSA<br> GT

| 70

| {{flagicon|FRA}} JMS Racing<br>{{flagicon|FRA}} ASA Cachia

| {{flagicon|FRA}} Jean-Pierre Delaunay<br>{{flagicon|FRA}} [[Jacques Guérin]]<br>{{flagicon|GBR}} Simon Delautour

| [[Porsche 911#911 Carrera RS (1973 and 1974)|Porsche 911 Carrera RSR]]

| Porsche 3.0L F6

| {{Dunlop}}

| 275

! 13

| Gr.6<br>S 3.0

| 1

| {{flagicon|FRA}} Inaltéra

| {{flagicon|FRA}} [[Jean-Pierre Beltoise]]<br>{{flagicon|USA}} [[Al Holbert]]

| [[Inaltera GTP|Inaltéra LM77]]

| Cosworth DFV 3.0L V8

| {{Goodyear}}

| 275

! 14

| IMSA<br> GT

| 79

| {{flagicon|FRA}} Frères Ravenel <br>''(private entrant)''

| {{flagicon|FRA}} Jean-Louis Ravenel<br>{{flagicon|FRA}} Jean ‘Jacky’ Ravenel<br>{{flagicon|FRA}} Jean-Marie Détrin

| Porsche 911 Carrera RS

| Porsche 3.0L F6

| {{Dunlop}}

| 274

! 15

| GTP

| 86

| {{flagicon|FRA}} [[Welter Racing|WM AEREM]]

| {{flagicon|FRA}} [[Max Mamers]]<br>{{flagicon|FRA}} [[Jean-Daniel Raulet]]

| Peugeot [[PRV engine|PRV]] 2.7L V6

| {{Michelin}}

| 274

! 16

| IMSA

| 75

| {{flagicon|USA}} [[North American Racing Team]]

| {{flagicon|FRA}} [[François Migault]]<br>{{flagicon|FRA}} Lucien Guitteny

| [[Ferrari Berlinetta Boxer#365 GT/4 BB|Ferrari 365 GT/4 BB]]

| Ferrari 4.4L V12

| {{Goodyear}}

| 268

! 17

| GTP

| 83

| {{flagicon|GBR}} R. Hamilton<br>''(private entrant)''

| {{flagicon|GBR}} Robin Hamilton<br>{{flagicon|GBR}} David Preece<br> {{flagicon|GBR}} [[Mike Salmon (racing driver)|Mike Salmon]]

| [[Aston Martin DBS]]

| Aston Martin 5.3L V8

| {{Dunlop}}

| 260

! 18

| Gr.5<br>SP

| 47

| {{flagicon|FRA}} A.-C. Verney <br>''(private entrant)'' / [[BP]]

| {{flagicon|FRA}} [[Anne-Charlotte Verney]]<br>{{flagicon|FRA}} [[René Metge]]<br>{{flagicon|FRA}} Dany Snobeck<br>{{flagicon|FRA}} Hubert Striebig

| Porsche 911 Carrera RSR

| Porsche 3.0L F6

| {{Dunlop}}

| 254

! 19

| Gr.4<br>GT

| 56

| {{flagicon|FRA}} JMS Racing<br>{{flagicon|FRA}} ASA Cachia

| {{flagicon|FRA}} Jean-Louis Bousquet<br>{{flagicon|FRA}} Cyril Grandet<br>{{flagicon|FRA}} Philippe Dagoreau

| Porsche 3.0L F6 ''turbo''

| {{Dunlop}}

| 253

! 20

| IMSA<br> GT

| 77

| {{flagicon|BEL}} [[Wynn's|Wynn's International]]

| {{flagicon|USA}} [[Dennis Aase]]<br>{{flagicon|USA}} Bob Kirby<br>{{flagicon|USA}} John Hotchkis

| Porsche 911 Carrera RSR

| Porsche 3.0L F6

| {{Goodyear}}

| 246

! N/C*

| Gr.6<br>S 2.0

| 31

| {{flagicon|GBR}} Dorset Racing Associates

| {{flagicon|GBR}} Ian Harrower<br>{{flagicon|IRL}} [[Martin Birrane]]<br>{{flagicon|NLD}} Ernst Berg<br>{{flagicon|GBR}} [[Richard Down (racing driver)|Richard Down]]

| [[Lola Cars|Lola]] T294

| Cosworth BDA 1950cc S4

| {{Goodyear}}

| 213

|}

*<small>'''Note *''': Not Classified because did not cover sufficient distance (70% of the leader) at the 12, 18 or 24-hour intervals.</small><ref name="Spurring 2011, p.8">Spurring 2011, p.8</ref>

===Did Not Finish===

{| class="wikitable" style="font-size: 95%;"

! Pos

! Class

! No

! Team

! Drivers

! Chassis

! Engine

! Tyre

! Laps

! Reason

! DNF

| Gr.6<br>S 3.0

| 8

| {{flagicon|FRA}} [[Renault Sport|Équipe Renault Elf]]

| {{flagicon|FRA}} [[Patrick Depailler]]<br>{{flagicon|FRA}} [[Jacques Laffite]]

| [[Renault]] 1997cc V6 ''twin-turbo''

| {{Michelin}}

| 289

| Engine<br>(21hr)

! DNF

| Gr.5<br>SP

| 39

| {{flagicon|FRG}} Gelo Racing Team

| {{flagicon|FRG}} [[Klaus Ludwig]]<br>{{flagicon|AUS}} [[Tim Schenken]]<br> {{flagicon|FRG}} [[Hans Heyer]]<br>{{flagicon|NLD}} [[Toine Hezemans]]

| Porsche 935

| Porsche 2.9L F6 ''turbo''

| {{Goodyear}}

| 269

| Engine<br>(21hr)

! DNF

| Gr.6<br>S 3.0

| 9

| {{flagicon|FRA}} [[Renault Sport|Équipe Renault Elf]]

| {{flagicon|FRA}} [[Jean-Pierre Jabouille]]<br>{{flagicon|GBR}} [[Derek Bell (racing driver)|Derek Bell]]

| Renault Alpine A442

| Renault 1997cc V6 ''twin-turbo''

| {{Michelin}}

| 257

| Engine<br>(18hr)

! DNF

| GTX

| 96

| {{flagicon|CHE}} GVEA<br>{{flagicon|CHE}} Porsche Club Romand

| {{flagicon|CHE}} André Savary<br>{{flagicon|CHE}} Jean-Robert Corthay<br> {{flagicon|CHE}} [[Antoine Salamin]]

| Porsche 911 Carrera RS

| Porsche 3.0L F6

| {{Michelin}}

| 211

| Engine<br>(19hr)

! DNF

| IMSA<br> GT

| 78

| {{flagicon|GBR}} Charles Ivey Engineering

|{{ flagicon|USA}} John Rulon-Miller<br>{{flagicon|GBR}} John Cooper<br>{{flagicon|GBR}} Peter Lovett

| Porsche 911 Carrera RSR

| Porsche 3.0L F6

| {{Goodyear}}

| 198

| Engine<br>(18hr)

! DNF

| IMSA<br> GT

| 80

| {{flagicon|FRA}} B. Béguin<br>''(private entrant)''

| {{flagicon|FRA}} [[Bernard Béguin]]<br>{{flagicon|FRA}} René Boubet<br>{{flagicon|FRA}} Jean-Claude Briavoine

| Porsche 911 Carrera RS

| Porsche 3.0L F6

| {{Dunlop}}

| 191

| Engine<br>(17hr)

! DNF

| Gr.6<br>S 2.0

| 25

| {{flagicon|FRA}} Société Racing Organisation<br> Course

| {{flagicon|MAR}} [[Max Cohen-Olivar]]<br>{{flagicon|FRA}} Alain Flotard<br>{{flagicon|FRA}} Michel Dubois

| Chevron B36

| Simca-ROC 1996cc S4

| {{Goodyear}}

| 176

| Oil Leak<br>(17hr)

! DNF

| Gr.6<br>S 2.0

| 21

| {{flagicon|CHE}} P. Sauber AG /<br>{{flagicon|CHE}} Francy Racing

| {{flagicon|CHE}} Eugen Strähl<br>{{flagicon|CHE}} Peter Bernhard

| BMW M12 1998cc S4

| {{Goodyear}}

| 161

| Gearbox<br>(14hr)

! DNF

| Gr.4<br>GT

| 59

| {{flagicon|CHE}} Schiller Racing

| {{flagicon|FRA}} [[François Sérvanin]]<br>{{flagicon|FRA}} [[Laurent Ferrier]]<br>{{flagicon|FRA}} Franz Hummel

| Porsche 934

| Porsche 3.0L F6 ''turbo''

| {{Goodyear}}

| 160

| Engine<br>(13hr)

! DNF

| Gr.6<br>S 3.0

| 7

| {{flagicon|FRA}} [[Renault Sport|Équipe Renault Elf]]

| {{flagicon|FRA}} [[Patrick Tambay]]<br>{{flagicon|FRA}} [[Jean-Pierre Jaussaud]]

| Renault Alpine A442

| Renault 1997cc V6 ''twin-turbo''

| {{Michelin}}

| 158

| Engine<br>(12hr)

! DNF

| GTP

| 87

| {{flagicon|FRA}} B. Decure<br>''(private entrant)''

| {{flagicon|FRA}} Bernard Decure<br>{{flagicon|FRA}} [[Jean-Luc Thérier]]<br>{{flagicon|FRA}} “Cochise” (Jacky Cauchy)

| Renault [[PRV engine|PRV]] 2.7L V6

| {{Michelin}}

| 137

| Engine<br>(16hr)

! DNF

| Gr.4<br>GT

| 60

| {{flagicon|CHE}} Schiller Racing

| {{flagicon|CHE}} [[Claude Haldi]]<br>{{flagicon|CHE}} Florian Vetsch<br>{{flagicon|CHE}} Angelo Pallavicino

| Porsche 934

| Porsche 3.0L F6 ''turbo''

| {{Goodyear}}

| 123

| Engine<br>(10hr)

! DNF

| Gr.4<br>GT

| 57

| {{flagicon|LUX}} N. Koob<br>''(private entrant)''

| {{flagicon|LUX}} Nicolas Koob<br>{{flagicon|BEL}} Willy Braillard<br>{{flagicon|ECU}} Guillermo Ortega

| Porsche 934

| Porsche 3.0L F6 ''turbo''

| {{Dunlop}}

| 116

| Engine<br>(14hr)

! DNF

| Gr.4<br>GT

| 55

| {{flagicon|ESP|1977}} Escuderia Montjuich

| {{flagicon|ESP|1977}} [[Juan Fernández (racing driver)|Juan Fernández]]<br>{{flagicon|ESP|1977}} [[Eugenio Baturone]]<br>{{flagicon|ESP|1977}} Raphael Tarradas

| Porsche 934

| Porsche 3.0L F6 ''turbo''

| ?

| 115

| Lost wheel<br>(10hr)

! DNF

| Gr.6<br>S 2.0

| 14

| {{flagicon|FRA}} D.Broudy<br>''(private entrant)''

| {{flagicon|FRA}} Xavier Lapeyre<br>{{flagicon|FRA}} Patrick Perrier

| Cosworth DFV 3.0L V8

| {{Goodyear}}

| 104

| Engine<br>(11hr)

! DNF

| Gr.6<br>S 2.0

| 29

| {{flagicon|ITA}} [[Osella|Osella Squadra Corse]]

| {{flagicon|FRA}} [[Alain Cudini]]<br>{{flagicon|FRA}} Raymond Touroul<br>{{flagicon|ITA}} Anna Cambiaghi

| BMW M12 1993cc S4

| {{Goodyear}}

| 100

| Transmission<br>(9hr)

! DNF

| Gr.4<br>GT

| 63

| {{flagicon|FRA}} J. Laplacette<br>''(private entrant)''

| {{flagicon|FRA}} Joël Laplacette<br>{{flagicon|FRA}} [[Yves Courage]]<br> {{flagicon|FRA}} "Ségolen" (André Gahinet)

| Porsche 911 Carrera

| Porsche 3.0L F6

| {{Michelin}}

| 100

| Engine<br>(14hr)

! DNF

| Gr.6<br>S 2.0

| 32

| {{flagicon|CHE}} Cheetah Racing Cars<br>{{flagicon|CHE}} A. Chevalley

| {{flagicon|CHE}} André Chevalley<br>{{flagicon|FRA}} François Trisconi<br> {{flagicon|USA}} Wink Bancroft

| Cheetah G-501

| Cosworth BDG 1975c S4

| {{Goodyear}}

| 93

| Gearbox<br>(8hr)

! DNF

| Gr.5<br>SP

| 48

| {{flagicon|FRA}} T. Perrier <br>''(private entrant)''

| {{flagicon|FRA}} [[Thierry Perrier]]<br>{{flagicon|FRA}} Jean Belliard

| Porsche 911 Carrera

| Porsche 3.0L F6

| {{Dunlop}}

| 90

| Engine<br>(10hr)

! DSQ

| GTP

| 85

| {{flagicon|FRA}} WM AEREM

| {{flagicon|FRA}} Marc Sourd<br>{{flagicon|FRA}} Xavier Mathiot

| Peugeot PRV 2.7L V6 ''twin-turbo''

| {{Michelin}}

| 90

| Insufficient distance<br>(14hr)

! DNF

| Gr.5<br>SP

| 49

| {{flagicon|FRA}} H. Striebig<br>''(private entrant)'' / BP

| {{flagicon|FRA}} Hubert Striebig<br>{{flagicon|FRA}} [[Guy Chasseuil]]<br> {{flagicon|FRG}} Helmut Kirchoffer

| Porsche 934/5

| Porsche 3.2L F6 ''turbo''

| {{Dunlop}}

| 65

| Fuel pump<br>(4hr)

! DNF

| Gr.6<br>S 3.0

| 11

| {{flagicon|USA}} Grand Touring Cars Inc

| {{flagicon|USA}} [[Sam Posey]]<br>{{flagicon|FRA}} [[Michel Leclère]]

| Mirage M8

| Renault 1997cc V6 ''turbo''

| {{Goodyear}}

| 58

| Engine<br>(4hr)

! DNF

| Gr.5<br>SP

| 41

| {{flagicon|FRG}} Martini Racing Porsche System

| {{flagicon|FRG}} [[Rolf Stommelen]]<br> {{flagicon|LIE}} [[Manfred Schurti]]

| [[Porsche 935#935/77|Porsche 935-77]]

| Porsche Type-935 2.9L F6 ''twin-turbo''

| {{Dunlop}}

| 52

| Engine<br>(4hr)

! DNF

| Gr.4<br>GT

| 62

| {{flagicon|FRA}} G. Bourdillat<br>''(private entrant)''

| {{flagicon|FRA}} Georges Bourdillat<br>{{flagicon|FRA}} [[Bruno Sotty]]<br>{{flagicon|FRA}} Alain-Michel Bernhard

| Porsche 911 Carrera

| Porsche 3.0L F6

| ?

| 52

| Engine<br>(5hr)

! DNF

| IMSA<br> GT

| 72

| {{flagicon|BEL}} Luigi Racing

| {{flagicon|GBR}} [[Tom Walkinshaw]]<br>{{flagicon|BEL}} Eddy Joosen<br>{{flagicon|BEL}} Claude de Wael

| [[BMW M30]] 3.2L S6

| {{Dunlop}}

| 46

| Engine<br>(4hr)

! DNF

| Gr.6<br>S 3.0

| 3

| {{flagicon|FRG}} Martini Racing Porsche System

| {{flagicon|BEL}} [[Jacky Ickx]]<br> {{flagicon|FRA}} [[Henri Pescarolo]]

| Porsche 936-77

| Porsche 911/78 2.1L F6 ''twin-turbo''

| {{Dunlop}}

| 45

| Engine<br>(3hr)

! DNF

| GTP

| 89

| {{flagicon|FRA}} Team Esso Aseptogyl

| {{flagicon|FRA}} Christine Dacremont<br>{{flagicon|FRA}} Marianne Hoepfner

| [[Lancia Stratos]] Turbo

| [[Ferrari Dino engine|Ferrari]] 2.4L V6 ''turbo''

| {{Michelin}}

| 37

| Engine<br>(4hr)

! DNF

| IMSA<br> GT

| 76

| {{flagicon|FRA}} Garage du Bac <br>{{flagicon|FRA}} Jean-Claude Giroix<br>''(private entrant)''

| {{flagicon|FRA}} "Dépnic" (Jean-Claude Depince) <br>{{flagicon|FRA}} Jacques Coulon

| BMW M30 3.2L S6

| {{Dunlop}}

| 28

| Electrics<br>(4hr)

! DNF

| Gr.6<br>S 2.0

| 28

| {{flagicon|FRA}} J.-M. Lemerle<br>''(private entrant)''

| {{flagicon|FRA}} Jean-Marie Lemerle<br>{{flagicon|FRA}} Alain Levié<br>{{flagicon|FRA}} Pierre-François Rousselot

| Lola T294

| Simca-ROC 1996cc S4

| {{Goodyear}}

| 27

| Fuel pump<br>(4hr)

! DNF

| Gr.6<br>S 2.0

| 22

| {{flagicon|GBR}} Chandler IBEC<br>{{flagicon|GBR}} Team [[Lloyd's of London|Lloyd's]]

| {{flagicon|GBR}} Tony Charnell<br>{{flagicon|GBR}} Ian Bracey<br>{{flagicon|GBR}} John Hine<br>{{flagicon|GBR}} Robin Smith

| [[Chevron B31]]

| Cosworth FVD 1985cc S4

| {{Goodyear}}

| 21

| Gearbox<br>(4hr)

! DNF

| Gr.6<br>S 2.0

| 30

| {{flagicon|CHE}} GVEA<br>{{flagicon|CHE}} Écurie Rolloise

| {{flagicon|CHE}} Georges Morand<br>{{flagicon|CHE}} Christian Blanc<br>{{flagicon|FRA}} Fréderic Alliot

| Lola T296

| Cosworth BDG 1992cc S4

| {{Goodyear}}

| 19

| Engine<br>(2hr)

! DNF

| Gr.5<br>SP

| 38

| {{flagicon|FRG}} Gelo Racing Team

| {{flagicon|FRG}} [[Klaus Ludwig]]<br>{{flagicon|NLD}} [[Toine Hezemans]]<br> {{flagicon|FRG}} [[Hans Heyer]]

| Porsche 935

| Porsche Type-935 2.9L F6 ''turbo''

| {{Goodyear}}

| 15

| Engine<br>(1hr)

! DNF

| Gr.5<br>SP

| 42

| {{flagicon|FRG}} Porsche Kremer Racing

| {{flagicon|GBR}} [[John Fitzpatrick (racing driver)|John Fitzpatrick]]<br>{{flagicon|GBR}} [[Guy Edwards]]<br> {{flagicon|GBR}} [[Nick Faure]]

| [[Porsche 935#935 K2, K3 and K4 by Kr3mer|Porsche 935 K2]]

| Porsche Type-935 2.9L F6 ''turbo''

| {{Goodyear}}

| 15

| Turbo<br>(1hr)

! DNF

| Gr.6<br>S 3.0

| 16

| {{flagicon|FRA}} J. Haran / [[Oreca|H. de Chaunac]] <br>''(private entrant)''

| {{flagicon|FRA}} [[Didier Pironi]]<br>{{flagicon|FRA}} [[René Arnoux]]<br> {{flagicon|FRA}} [[Guy Fréquelin]]

| Renault Alpine A442

| Renault 1997cc V6 ''twin-turbo''

| {{Michelin}}

| 0

| Fire<br>(1hr)

|}

===Did Not Start===

{| class="wikitable" style="font-size: 95%;"

! Pos

! Class

! No

! Team

! Drivers

! Chassis

! Engine

! Tyre

! Reason

! DNQ

| Gr.6<br>S 3.0

| 6

| {{flagicon|GBR}} A. de Cadenet<br>''(private entrant)''

| {{flagicon|GBR}} Simon Phillips<br>{{flagicon|GBR}} Richard Bond<br>{{flagicon|GBR}} Tony Birchenhough

| De Cadenet-Lola T380

| Cosworth DFV 3.0L V8

| {{Goodyear}}

| Did not qualify

! DNQ

| Gr.6<br>S 2.0

| 20

| {{flagicon|FRA}} D. Brillat<br>''(private entrant)''<br>{{flagicon|FRA}} Seymaz Racing

| {{flagicon|FRA}} Daniel Brillat<br>{{flagicon|FRA}} Eric Vuagnat<br> {{flagicon|CHE}} Sandro Plastina

| Cheetah G-601

| BMW M12 1998cc S4

| {{Goodyear}}

| Accident

! DNQ

| Gr.6<br>S 2.0

| 27

| {{flagicon|FRA}} Société Racing Organisation<br> Course

| {{flagicon|FRA}} Fred Stalder<br> {{flagicon|FRA}} Jacky Haran<br>{{flagicon|FRA}} Jean-Louis Bos

| Chevron B36

| Simca-ROC 1996cc S4

| {{Goodyear}}

| Did not qualify

! DNQ

| Gr.5<br>SP

| 43

| {{flagicon|FRA}} L. Meznarie<br>''(private entrant)''

| {{flagicon|FRA}} [[Thierry Sabine]]<br>{{flagicon|FRA}} Jean Bélin

| Porsche 911 Carrera RSR

| Porsche 3.2L F6

| {{Dunlop}}

| Did not qualify

! DNQ

| Gr.4<br>GT

| 66

| {{flagicon|FRA}} "Ségolen"

| {{flagicon|FRA}} "Ségolen" (André Gahinet)<br>{{flagicon|FRA}} Christian Bussi

| Porsche 934

| Porsche 3.0L F6 ''turbo''

| {{Michelin}}

| Did not qualify

! DNQ

| IMSA<br> GT

| 73

| {{flagicon|FRA}} M. Ouviére<br>''(private entrant)''

| {{flagicon|FRA}} [[Roger Dorchy]]<br>{{flagicon|FRA}} [[Philippe Streiff]]<br> {{flagicon|FRA}} Philippe Jaffrenou

| Porsche 911 Carrera RS

| Porsche 3.0L F6

| {{Michelin}}

| Did not qualify

! DNA

| GTP

| 84

| {{flagicon|FRA}} J.-L. Chateau<br>''(private entrant)''

| {{flagicon|FRA}} Jean-Louis Chateau<br>{{flagicon|FRA}} Jean-Marie Tranchant

| Porsche 935

| Porsche Type-935 3.0L F6 ''turbo''

| {{Dunlop}}

| Not all drivers<br>qualified

! DNA

| Gr.4<br>GT

| 67

| {{flagicon|ITA}} Scuderia [[Jolly Club]]

| {{flagicon|ITA}} Anna Cambiaghi<br>{{flagicon|ITA}} Emilio Paleari

| Lancia Stratos HF

| [[Ferrari Dino engine|Ferrari]] 2.4L V6

| ?

| Did not arrive

|}

===Class Winners===

{|class="wikitable" style="font-size: 95%"

! Class

! Winning Car

! Winning Drivers

! Group 6 S<br> Sports 3-litre

| #4 Porsche 936

| Barth / Haywood / Ickx

! Group 6 S<br> Sports 2-litre

| #26 Chevron B36

| Pignard / Dufrène / Henry *

! Group 5 SP<br> Special Production

| #40 Porsche 935

| Ballot-Léna / Gregg

! Group 4 GTS<br> Special GT

| #58 Porsche 934

| Wollek / “Steve” / Gurdjian *

! GTP<br> Le Mans GT Prototype

| #88 Inaltéra LM77

| Rondeau / Ragnotti *

! GTX<br> Le Mans GT Experimental

|colspan=2| no finishers

! IMSA GT

| #71 BMW 3.0 CSL

| Dieudonné / Xhenceval / Dini *

|}

*<small>'''Note''': setting a new class distance record.</small>

===Index of Energy Efficiency===

{| class="wikitable" style="font-size: 95%;"

! Pos

! Class

! No

! Team

! Drivers

! Chassis

! Score

! 1

| Gr.6<br>S 2.0

| 26

| {{flagicon|FRA}} Société Racing Organisation<br> Course

| {{flagicon|FRA}} Michel Pignard<br>{{flagicon|FRA}} Albert Dufrène<br>{{flagicon|FRA}} Jacques Henry