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Originally known for modified Liberty engines, the V-1710 was the first truly Allison engine, and became the first American engine to qualify at 746 kW (1,000 horsepower) for the 150-hour military type test. It was the only liquid cooled engine that saw service in World War II, powering most war time U.S. Army fighters, including the P-38, P-39, P-40, P-63, and early P-51s.

In 1937, Allison began development of the V-3420, comprised of two V-1710 engines geared together on a common crankcase. This project resulted from an Army Air Corps interest in a 1,500 kW (2,000 hp) bomber engine. However, development was not pressed until late in the war because of the need for improving the V-1710. Plans were made for producing the V-3420 in large quantity for a high-speed, low-altitude fighter, the Fisher P-75, but only about 100 engines were produced before the project was dropped.

This engine powered the Fisher XP-75A and P-75A.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date Circa World War II Country of Origin United States of America Type PROPULSION-Reciprocating & Rotary Manufacturer Allison Division, General Motors Corporation
 Physical Description Type: Reciprocating, 24 cylinders, liquid-cooled, Power rating: 1,939 kW (2,600 hp) at 3,000 rpm Displacement: 56 L (3,420 cu in.) Bore and Stroke: 140 mm (5.5 in.) x 140 mm (5.5 in.) Weight: 1,485.5 kg (3,275 lb) Dimensions Height 104 cm (40.9 in.), Width 152.2 cm (59.9 in.), Depth 685.8 cm (270 in.)
 Materials Aluminum, Steel, Magnesium, Paint, Copper, Rubber, Wood, Phenolic, Preservative coating
 Inventory Number A19660386000 Credit Line Transferred From USAAF Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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