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ALFA ROMEO 121

The Alfa Romeo 121 was an eight-cylinder, air-cooled, inverted V engine for aircraft use produced in Italy. It was primarily used in the Ambrosini S.7.


Manufacturer: Alfa Romeo
Developed: N/A
Type: Eight-cylinder inverted V-8 air-cooled engine
Bore: 120 mm (4.72 in)
Stroke: 110 mm (4.33 in)
Displacement: 9.9952 Liters (609.9 inĀ³)
Length: 1,780 mm (70 in)
Width: 684 mm (26.9 in)
Height: 700 mm (27.5 in)
Dry weight: 345 kg (760 lb)

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

Power output:
– 284 kW (400 hp) at 3,000 rpm (take-off)
– 246kW (330 hp) at 3,000 rpm (max continuous power)
Compression ratio: 6.5:1
Specific fuel consumption: 290 g/hp/h (0.63 lb/hp/hr) (take-off)
Oil consumption: 2.5 kg/h (5.5 lb/hr)
Power-to-weight ratio: 0.82 kg/kW (0.53 hp/lb)


Applications:
– Ambrosini S.7

Sources:
Bridgman, Leonard (ed.) (1953). Jane's All The World's Aircraft 1953-54. London: Jane's.

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