Lycoming IO-390

IO-390
Type Piston aero-engine
National origin United States
Manufacturer Lycoming Engines
First run 2002
Major applications Cirrus SR20
Tecnam P2010
Produced 2009–present
Developed from Lycoming IO-360
Lycoming IO-580

The Lycoming IO-390 engine is a horizontally opposed, four-cylinder aircraft engine, manufactured by Lycoming Engines.

There is no carburetted version of the engine, which would have been designated O-390 and therefore the base model is the IO-390.