What is lycoming 0290?

Lycoming O-290 is an aviation gasoline engine produced by the Lycoming Engine Company that has a displacement of 4.8 liters (290 cubic inches) and powers light aircraft. It is a four-cylinder, air-cooled, horizontally opposed engine with a power output of 125 to 135 horsepower. The O-290 features a direct-drive design, meaning the propeller is directly attached to the engine crankshaft. It has a dry weight of 280 pounds and has been used in aircraft such as the Piper PA-18 Super Cub and the Cessna 170. The engine was first produced in the 1950s and has been a popular choice for pilots due to its reliability and durability.