Lycoming’s smallest 4-cylinder engine is a popular choice for home-built, as well as OEM-produced aircraft.

With models producing up to 125 horsepower at 2800 rpm, this rugged “little engine that could” still does in aircraft around the world.

The Lycoming O-235 series engines are four-cylinder, direct-drive, horizontally opposed, wet-sump, air-cooled models.  The cylinders are of conventional air-cooled construction with heads made from an aluminum-alloy casting and a fully machined combustion chamber.  The cylinder barrels are machined from chrome nickel molybdenum steel forgings with deep integral cooling fins, ground and honed to a final specified finish.

Forged-steel connecting rods

Nitride-hardened steel alloy cylinder barrels

Forged-steel crankshafts

Forged-steel camshafts

Chromium-modified ni-resist iron exhaust-valve guides, resulting in better wear characteristics

Optional chrome kit

Optional fixed-pitch or constant-speed propeller applications