Alfa Romeo 121

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

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).

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)

References

^ Bridgman, Leonard, ed. (1953). Jane's All The World's Aircraft 1953-54. London: Sampson Low, Marston & Company, Ltd. p. 333.
^ Bridgman, Leonard (1955). Jane's all the World's Aircraft 1955-56. London: Sampson Low, Marston & Company, Ltd.
^ Bridgman, Leonard (1947). Jane's all the World's Aircraft 1947. London: Sampson Low, Marston & Company, Ltd. p. 50d.