The Alfa Romeo 121 was an eight-cylinder, air-cooled, inverted V engine for aircraft use produced in Italy. It was typically rated at 280 kW (380 hp).

121
Alfa Romeo 121 RC14
Type	V-8 aircraft engine
Manufacturer	Alfa Romeo
Major applications	Ambrosini S.7

Variants

121 R.C.14

121 R.C.20

121 R.C.22

Applications

• Ambrosini S.7

Specifications

Data from Jane's All The World's Aircraft 1953-54,[1] Jane's all the World's Aircraft 1955-56,[2] Jane's all the World's Aircraft 1947[3]

General characteristics

• Type: V-8 inverted air-cooled engine
• Bore: 120 mm (4.7 in)
• Stroke: 110 mm (4.3 in)
• Displacement: 9.9952 L (609.9 in³)
• Length: 1,780 mm (70.08 in)
• Width: 684 mm (26.9 in)
• Height: 700 mm (27.6 in)
• Dry weight: 345 kg (761 lb)

Components

• Supercharger: Centrifugal type
• Fuel system: Two horizontal carburettors, or one injection carburettor
• Fuel type: 100/130 octane gasoline
• Oil system: Pressure type.One pressure and three scavenge pumps
• Cooling system: Air cooling
• Reduction gear: Spur gear type: reduction ratio 0.621:1

Performance

• Power output: 284 kW (381 hp) at 3,000 rpm (take-off), 246 kW (330 hp) at 3,000 rpm (max continuous power)
• Compression ratio: 6.5:1
• Specific fuel consumption: 0.63 lb/(hp⋅h) (0.38 kg/kWh) (take-off power),
• Oil consumption: 2.5 kg/h (5.5 lb/h)
• Power-to-weight ratio: 0.82 kg/kW (1.35 lb/hp)

See also

Related lists

• List of aircraft engines

References

Wikimedia Commons has media related to Alfa Romeo 121.

Further reading

• Gunston, Bill (1987). World encyclopaedia of aero engines (Reprint. ed.). Wellingborough: Stephens. p. 9. ISBN 978-0-85059-717-2.