The Liberty became the standard U.S. wartime aircraft engine of WWI. It was produced by Packard, Lincoln, Ford, General Motors (Cadillac and Buick), Nordyke, and Marmon.
Liberty Engine
The Liberty engine was the United State's most significant contribution to the war effort. This is the 400-horsepower (298-kilowatt) V-12, air-cooled version. It was one of WWI's most powerful engines and one of the workhorses of the war. More than 20,000 were built by the time production ended early in 1919.