POWERPLANTS RESOURCE CENTER > ITALY > PREVIOUS PAGE
Manufacturer: Alfa Romeo
Developed: 1920s
Type: Water cooled 60° upright V-12
Bore: 135 mm (5.31 in)
Stroke: 140 mm 5.51 in)
Displacement: 24.0 L ( 1,464 cu in)
Length: 1.751 m (68.94 in)
Width: 653 mm (25.71 in)
Height: 935 mm (36.82 in)
Dry weight: 480 kg (1,060 lb)
Components:
– Valvetrain: Two overhead camshafts, geared together, driving two inlet and two exhaust valves per cylinder. Housed under aluminium casings.
– Fuel system: Twin water heated Fiat carburetters mounted between cylinder banks, one serving each bank. Two spark plugs per cylinder, placed horizontally and opposite each other, supplied by two Marelli MF.12 magnetos.
– Oil system: One delivery pump and two scavenge pumps, in a single unit.
– Cooling system: water, with centrifugal pump.
– Reduction gear: 1.611:1 spur gear, lubricated via oil spout.
– Cylinders: Forged steel barrels, with closed, flat ends.
– Pistons: Aluminium alloy, two compression rings and one scraper ring above a fully floating gudgeon pin, with a second scraper ring below it.
– Crankshaft: Each six throw, seven bearings.
– Crankcase: Each an aluminium casting, split on crankshaft centre line. Bolted-on duralumin end caps.
Performance:
Power Output:
– Normal: 600 hp at 2,000 rpm at sea level
– Take-Off: 800 hp at 2,900 rpm.
Compression ratio: 8:1
Fuel consumption: 0.322 kg/kW/h (0.529 lb/hp/h)
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.
A.30 R.A.
A.30 R.A.bis
Applications:
– CMASA MF.10
– Fiat CR.30
– Fiat CR.32
– Fiat CANSA FC.12
– IMAM Ro.37
Sources:
Bridgman, Leonard (ed.) (1938). Jane's All The World's Aircraft 1938. London: Sampson Low and Marston Co. Ltd.
POWERPLANTS RESOURCE CENTER > ITALY > PREVIOUS PAGE