Alfa Romeo 121
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).Applications: Ambrosini S.7Specifications: Type: Eight-cylinder inverted V-8 air-cooled engine Bore: 120 mm (4.72 in) Stroke: 110 mm (4.33 in) Displacement: 9.9952 L (609.9 in³) Length: 1,780 mm (70 in) Width: 684 mm (26.9 in) Height: 700 mm (27.5 in) Dry weight: 345 kg (760 lb)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 0.621:1Power 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/hr (0.63 lb/hp/hr) (take-off), Oil consumption: 2.5 kg/hr (5.5 lb/hr) Power-to-weight ratio: 0.82 kg/kW (0.53 hp/lb)
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