The Fiat A.12 was a six-cylinder liquid-cooled in-line engine 160 mm x 180 mm, 21.71 liters, 245–300 hp at 1,700 rpm. The A.12 was a rather large aero engine at the time and its dimensions were more typical of a marine engine, but it was efficient and reliable. No doubt Fiat's experience with large racing engines contributed to its success. A total of 13,260 A.12s were produced between 1916 and 1919.
IVL A.22 Hansa
SIAI S.16 and S.16bis (A.12bis)
Vickers Vimy (only one prototype)
Type: 6-cylinder liquid-cooled inline engine.
Bore: 160 mm (6.30 in)
Stroke: 180 mm (7.09 in)
Displacement: 21.71 L (1,325.1 cu in)
Length: 1,780 mm (70 in)
Width: 560 mm (22 in)
Height: 1,130 mm (44.5 in)
Dry weight: 415 kg (915 lb)
Fuel system: Carburetor
Fuel type: octane
Cooling system: Liquid
Power output: 245 hp at 1,700 rpm