Allison V-1710

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The Allison V-1710 was an American V12 aircraft engine designed and produced by the Allison Engine Company. Liquid-cooled, it was the most common US-developed engine of its type in service during World War II. Versions equipped with turbochargers (called "turbo-superchargers" at the time) gave excellent performance at high altitude in the twin-engined Lockheed P-38 Lightning, and turbochargers were also fitted to experimental single-engined fighters with similar results. The United States Army Air Corps (USAAC) preference for turbochargers early in the V-1710's development program meant that less effort was spent on developing suitable mechanically driven centrifugal superchargers for the Allison V12 design, as other V12 designs from friendly nations like the British Rolls-Royce Merlin were already using. When smaller-dimensioned or lower-cost versions of the V-1710 were desired, they generally had poor performance at higher altitudes.