How many cubic inches or litres was the Offy engine?
Their standard engine was a four cylinder in line.
However, Offenhauser also manufactured six cylinder and eight cylinder, both in-line and V type engines.
“The Offenhauser engine, commonly known as the “Offy,” was developed in the 1930s by Fred Offenhauser and Harry Miller, originally as a marine engine. It became highly successful in American open-wheel racing, dominating events like the Indianapolis 500 for over 50 years, with its design evolving to produce remarkable power and reliability throughout its history”.