Offenhauser engine

UNKNOWN: The Offenhauser engine, familiarly known as the "Offy," was developed by Fred Offenhauser and his employer, Harry Miller, and their original design would be used in Midgets and Sprint Cars well into the 1960s. When Miller went bankrupt in 1933, Offenhauser and another Miller employee, Leo Goossen, bought the shop and the rights to the engine, which they further developed into the Offenhauser engine. One of the keys to the Offenhauser engine's success was power. A 251.92 cubic inch twin-cam four-cylinder racing Offy could produce 420 horsepower at 6,600 rpm. From 1934, through the 1970s, the Offenhauser engine dominated American open wheel racing, winning the Indianapolis 500 27 times. (Photo by ISC Images & Archives via Getty Images)