What does the "IO" in IO-360-L2A stand for?

The "IO" in IO-360-L2A stands for "Fuel Injected." This designation indicates that the engine is equipped with a fuel injection system, as opposed to a carbureted system. Fuel injected engines, like the IO-360, use an injection system to deliver fuel directly into the combustion chamber, which can enhance performance, improve fuel efficiency, and reduce the likelihood of icing that can occur with carbureted systems.

The inclusion of "IO" reflects a design that allows for more precise control of the air-fuel mixture, which is critical for optimal engine performance across various operating conditions. This designation is a key aspect of the engine's identity and functionality, distinguishing it from other engine types that may utilize different fuel delivery methods.