What is 0-235 lycoming?

The Lycoming O-235 is an air-cooled, four-cylinder, horizontally opposed piston engine used in a variety of general aviation aircraft, including Cessna 152, Piper PA-28 Cherokee, and Grumman American AA-1. The engine produces 100-115 horsepower and has a displacement of 235 cubic inches. It was first introduced in 1940 and has undergone multiple modifications and upgrades over the years. It is known for its reliability and durability and is a popular choice for training aircraft and personal aircraft.