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Manufacturer: Alfa Romeo
Developed: N/A
Type: 18-cylinder air-cooled radial
Bore: 140 mm (5.51 in)
Stroke: 165 mm (6.50 in)
Displacement: 45.72 L (2789.9 cu in)
Length: 1,155 mm (45.47 in)
Width: 653 mm (25.71 in)
Height: 1,335 mm (52.56 in)
Dry weight: 725 kg (1598.4 lb)
Components:
– Valvetrain: One intake and one sodium-cooled exhaust valve per cylinder
– Supercharger: Single Speed, Single Stage. 4,100 m rated altitude
– Fuel system: 1 Fiat carburettor
– Fuel type: 87 octane
– Cooling system: air-cooled
Performance:
Power Output:
– 1,100 hp at 2,100rpm at Sea Level
– 1,000 hp at 2,100 rpm at 4,100 m (13,500 ft)
Compression ratio: 6.7:1
Power-to-weight ratio: 0.6 hp/lb at cruise speed
Variants:
The Italian engine designation system includes a suffix indicating major components or attributes. The most common were R for Riduttore - reduction gear and C for Compressore - compressor/supercharger, followed by a number indicating the rated altitude in hundreds of metres, two speed superchargers were indicated by a double figure such as 10/34.
Fiat A.80 R.C.20
With reduction gear and supercharger, rated altitude 2,000 m (6,600 ft).
Fiat A.80 R.C.41
With reduction gear and supercharger, rated altitude 4,100 m (13,500 ft).
Applications:
– Aeronautica Umbra Trojani AUT.18
– Breda Ba.65
– CANSA FC.20
– Fiat BR.20
– Savoia-Marchetti SM.79
Sources:
Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens.
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