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.[1] 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.30.[2]

Type nine-cylinder radial engine
Manufacturer Alfa Romeo
First run 1930s
Number built ~600


Specifications (D2 C.30)

Data from [2]

General characteristics


  • Valvetrain: dual cam ring driving 2 overhead valves per cylinder via push-rods and rockers
  • Supercharger: 2.5:1
  • Fuel system: Memini carburettor with automatic servo-boost control
  • Oil system: dual gear pumps
  • 2x Marelli MF.9 magnetos


  • Power output: normal 205 kW (275 hp) at 2,000 rpm at 2,500 m (8,200 ft); maximum 230 kW (310 hp) at 2,200 rpm at 2,250 m (7,380 ft)
  • Compression ratio: 5:1

See also

Related lists


  1. "STORY OF THE ALFA ROMEO FACTORY AND PLANTS page 12" (PDF). Archived from the original (PDF) on 2007-09-29. Retrieved 2007-08-25.
  2. Jane's All the World's Aircraft 1937. London: Sampson, Low & Martin company Limited. 1937. p. 67d.
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