The only American liquid-cooled engine to see service in World War II was the Allison V-1710. It was one of the most important large U.S. aero engines, with over 70,000 engines produced from the time of the first in 1931 to the last in 1948. The engine was produced for several important fighters of WWII, including the P-38 Lightning , P-39 Airacobra, P-40 Warhawk, P-51A Mustang, P-63 Kingcobra, P-82 Twin Mustang and the Consolidated XA-11A, an experimental attack version of the Consolidated P-25. Allison was an Indianapolis firm that had done well in a small way with Liberty modifications and with reduction gears for others' engines. Allison became a part of general motors in 1929, and the firm today remains a GM component as Detroit Diesel Allison Division
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