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Gnome-Rhône 14N




The 14N was a 14-cylinder two-row air-cooled radial engine designed and manufactured by Gnome-Rhône. A development of the pre-war Gnome-Rhône 14K, the 14N was used on several French and German aircraft of World War II.

Facing criticisms over the 14K's reliability, Gnome-Rhône undertook a major upgrade of its 14-cylinder design, using different materials for the pistons and valves, and enlarging cooling surfaces by 39%.

The new 14N was introduced in 1937 and was quickly adopted on several aircraft models. In 1939, minor improvements allowed Gnome-Rhône to increase the compression ratio from 6.1:1 to 6.8:1, which resulted in increased power for wartime production aircraft.

The 14N was further developed into the Gnome-Rhône 14R featuring a 2-stage supercharger, but this type was not widely used until after World War II as production of improved engines was prohibited by the terms of the armistice with Germany.


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Amiot 354
Bloch MB.131
Bloch MB.151
Bloch MB.152
Bloch MB.155
Bloch 174
Bloch 175
Bloch MB.210
Breguet 891R Mars (2 × 14R)
Farman F.222
Latécoère 611
Lioré et Olivier LeO 45
Sud-Est SE.161 Languedoc
Messerschmitt Me 323
Koolhoven F.K.58
PZL P.24
PZL.43 Karaś


14N 48/49
Type: Fourteen-cylinder two-row air-cooled piston engine
Bore: 146 mm (5.74 in)
Stroke: 165 mm (6.49 in)
Displacement: 38.67 L (2,360 in³)
Length: 1.48 m (66 in)
Diameter: 1.29 m (50.8 in)
Height: 1,289 mm (50.75 in)
Dry weight: 620 kg (1,370 lb)
Valvetrain: Two inlet and two exhaust overhead valves per cylinder
Supercharger: Single-stage single-speed centrifugal type supercharger
Fuel system: Stromberg carburetor
Fuel type: 87 octane rating gasoline
Cooling system: Air-cooled
Power output:
868 kW (1,164 hp) at 2,650 rpm for takeoff
728 kW (976 hp) at 2,400 rpm at sea level
780 kW (1,045 hp) at 2,400 rpm at 4,800 m (15,750 ft)
Specific power: 22.45 kW/l (0.49 hp/in³)
Compression ratio: 6.8:1
Power-to-weight ratio: 1.4 kW/kg (0.85 hp/lb)



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