Four-cylinder engines

flat-four piston aircraft engine family

four-cylinder horizontally-opposed piston aircraft engine family

German aircraft engine

4-cylinder horizontally-opposed piston engine family

motor vehicle engine

family of small, low-horsepower, four-cylinder, air-cooled engines

four-cylinder horizontally-opposed piston aircraft engine family

diesel aircraft engine produced by Continental Motors, Inc

O-4 piston aircraft engine family

engine family by Continental

Small aircraft engines

type of engine used in Subaru vehicles

Engine series from Subaru

Austrian turbocharged aircraft engine

1990s French piston aircraft engine

motor vehicle engine

O-4 piston aircraft engine

four-cylinder aircraft engine

aircraft engine family by Lycoming in the United States