Fiat AS.2

For the aircraft of the same name, see Fiat AS.2 (aircraft)

Type Piston V-12 aero engine
Manufacturer Fiat Aviazione
First run c.1925
Major applications Macchi M.39
Developed from Fiat A.22
Developed into Fiat AS.3

The Fiat AS.2 was an Italian 12-cylinder, liquid-cooled V engine designed and built in the mid-1920s by Fiat Aviazione especially for the 1926 Schneider Trophy air race.[1]

Design and development

Designed for the 1926 Schneider Trophy contest held at Hampton Roads, Virginia, the AS.2 was inspired by the American Curtiss D-12 engine. Unlike the D-12 the engine featured separate steel cylinders and cast aluminium alloy cylinder heads.[2] The starting point for the Italian engine was the earlier Fiat A.22.[3] The 'S' in AS stood for 'Spinto' (thrust). A weakness of the engine was its magnesium alloy pistons, a new engineering material at the time. Many pistons were holed. Despite the engine's technical problems it was successful at the Schneider Trophy event, winning on 13 November 1926, with a second AS.2 powered aircraft placing third.[4]


Specifications (AS.2)

Data from Eves[5]

General characteristics

  • Type: 12-cylinder V-engine
  • Bore: 140 mm (5.5 in)
  • Stroke: 170 mm (6.7 in)
  • Displacement: 30.955 litres (1,889 cu in)
  • Width: 720 mm
  • Height: 850 mm
  • Dry weight: 408 kg (900 lb)


  • Valvetrain: Two intake and two exhaust valves per cylinder
  • Fuel system: Carburettor
  • Cooling system: Liquid-cooled


See also

Comparable engines

Related lists



  1. Eves 2001, p. 214.
  2. Eves 2001, p. 243.
  3. Jane's All the World's Aircraft 1938
  4. Eves 2001, p. 243.
  5. Eves 2001, p. 215.


  • Grey, C.G. (1972). Jane's All the World's Aircraft 1938. London: David & Charles. pp. 68–9d. ISBN 0715 35734 4.
  • Eves, Edward The Schneider Trophy Story. Shrewsbury. Airlife Publishing Ltd., 2001. ISBN 1-84037-257-5.
  • Gunston, Bill. World Encyclopedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
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