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U.S.
British
German
Japanese  
U.S. Engine:
Allison V-1710
 

Allison V-1710-85
General Characteristics
Type:
12-cylinder supercharged
liquid-cooled 60° "Vee" piston
aircraft engine

Bore: 5.5 in
Stroke: 6 in
Displacement: 1,710 in³
Dry weight: 1,445 lb
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Performance
Power output: 1,325 hp @
3,000 rpm
Specific power: 0.77 hp/in³

Source: Wikipedia.com

Aircraft installations:
P-38, P-39, P-40, P-51, P-63, P-82


Source: Vintage V-12's

Allison V-1710
The Allison V-1710 aircraft engine was the only indigenous US-developed V-12 liquid-cooled engine to see service during WWII. A sturdy and trustworthy design, it was at first overlooked for a number of applications due to supercharger problems. After numerous improvements it found great demand in the later stages of the war.

Most V-1710s were equipped with an underdeveloped, single-stage supercharger, satisfactory at low altitude but severely limiting high-altitude performance. About this time the U.S. entered the war and some American fighter designs were changed to use the Packard built Rolls-Royce Merlin engine.

A two-stage supercharger was introduced for the V-1710, improving the late-war versions tremendously. It was later selected to power the Bell P-63.

Source: Wikipedia.com