18-cylinder engines

18-cylinder radial piston engine family by Pratt & Whitney

opposed-piston engine used in marine, firefighting and BR locomotive applications

1940s Japanese piston aircraft engine

piston engine with 18 cylinders in W configuration

rotary aircraft engine family by Gnome

R-18 piston aircraft engine

1940s Italian piston aircraft engine

Aircraft engine

motor Engine

aircraft engine

French series of aircraft engines