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ALFA ROMEO D2

The Alfa Romeo D2 was a nine-cylinder radial engine for aircraft use produced in Italy. It was typically rated between 240-270 hp. The engine was designed by Vittorio Jano and produced 600 units between 1931-1934. This engine was also first purpose-built aircraft engine produced by Alfa Romeo, before it all Alfa engines used in airplanes were derived from engines used in cars. A supercharged derivative was produced as the D2 C.

Manufacturer: Alfa Romeo
Developed: 1930s
Type: Nine-cylinder radial engine
Bore: 120 mm (4.724 in.)
Stroke: 135 mm (5.315 in.)
Displacement: 13.74 L (838.5 cu in)
Components:
– Supercharger: 2.5:1

Performance:
– Power output: 270 hp
– Compression ratio: 5:1

Applications:
– Breda Ba.25
– Caproni Ca.101
Sources:
Bridgman, Leonard (ed.) (1938). Jane's All The World's Aircraft 1938. London: Sampson Low and Marston Co. Ltd.
Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens.
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