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Gnome-Rhône 7K Titan Major

The Gnome-Rhône 7K Titan Major was a seven-cylinder 370 hp (270 kW) air-cooled radial engine, that started life as an enlarged Gnome-Rhône 5K with two extra cylinders. The Gnome-Rhône 5K was itself a licensed version of the Bristol Titan. The 7K is very comparable to the Bristol Neptune seven-cylinder engine since they used the same technology. The 7K was followed by the larger and more powerful nine-cylinder 550 hp (405 kW) Gnome-Rhône 9K Mistral. Gnome-Rhône later responded to the need for a more powerful engine by developing the 7K into a two-row version that became the Gnome-Rhône14K Mistral Major.

General characteristics: (7Kd)

• Type: Seven-cylinder air-cooled radial engine.
• Bore: 146 mm (5.75 in)
• Stroke: 165 mm (6.50 in)
• Displacement: 19.3 l (1,180 cu in)
• Length: 146 mm (5.75 in)
• Diameter: 1,235 mm (48.62 in)
• Dry weight: 270 kg (600 lb)

Components

• Valvetrain: Pushrod operated over-head valves, two per cylinder
• Supercharger: (7Ksd - single speed centrifugal blower)
• Fuel system: Carburetor
• Fuel type: Gasoline
• Cooling system: Air-cooled

Performance

• Power output:
• 7Kd - 260 kW (350 hp) at 2,000 rpm at sea-level for take-off
• 7Ksd - 272 kW (365 hp) at 2,000 rpm at 1,500 m (4,900 ft)
• 7Ksd - 250 kW (340 hp) at 2,000 rpm at 4,000 m (13,000 ft)
• Compression ratio: 5.5:1

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