Bristol Titan

The Bristol Titan was a five cylinder air cooled radial engine. It had the same size cylinders as the earlier Bristol Mercury engine, 5.75 in x 6.5 in (843.94 cu in/13.83 L) and produced between 200-240hp. Later versions of the Bristol Titan also used a Farman style reduction gear produced by Gnome-Rhône.

The engine was designed as a five-cylinder radial to use as many parts of the Bristol Jupiter as possible, cyclinders, pistons, articulated connecting rods, crankshaft and other minor parts were interchangeable with the Jupiter.^[1]

The major significance of the Titan was that it was licensed to Gnome-Rhône and became the pattern for the Gnome-Rhône 5K. In 1927 Gnome-Rhône was looking for ways out of its license agreement with Bristol for the Jupiter engine of 1920 and began to produce the Gnome-Rhône 5K without royalties.

The Gnome-Rhône 5K was built in much greater numbers than the original Bristol Titan. Gnome-Rhône was not satisfied with simply producing Bristol designs under license, and started a major design effort based around the mechanicals of the Titan engine. The results were introduced in 1927 as the K-series, spanning the 260 hp (190 kW) Gnome-Rhône 5K Titan, the 7-cylinder 370 hp (270 kW) the Gnome-Rhône 7K Titan Major, and the 9-cylinder 550 hp (405 kW) Gnome-Rhône 9K Mistral. With the introduction of the K-series, Gnome-Rhône finally ended royalty payments to Bristol. By 1930 they had delivered 6,000 Jupiters, Mistrals and Titans, making them the largest engine company in France.

Data from ^[2]

• Type: Five cylinder air cooled radial engine.
• Bore: 5.75 in (146 mm)
• Stroke: 6.5 in (165 mm)
• Displacement: 844 cu in (13.8 L)
• Diameter: 48.4 in (1229.3 mm)
• Dry weight: 500 lb (227 kg)
• Designer: Roy Fedden

• Valvetrain: Overhead valve
• Cooling system: Air cooled
• Reduction gear: Direct drive, left hand tractor

• Power output: 210 hp at 1,800 rpm
• Compression ratio: 5:1
• Power-to-weight ratio: 0.42 hp/lb

• Warner Scarab

• List of aircraft engines