The engine configuration describes the fundamental operating principles by which internal combustion engines are categorized.
1919 Napier Lion II aircraft engine with three cylinder banks
1928-1942 Indian Four straight-4 motorcycle engine
Douglas flat-twin motorcycle engine
A straight-three engine is a three-cylinder piston engine where cylinders are arranged in a line along a common crankshaft.
Engine configuration
…Straight-2 example Sunbeam S7 Straight-3, also known as "inline-triple" Straight-4…
Engine block of an Elsbett straight-three diesel engine
Circa-1960 Saab two-stroke engine
1969–1975 Kawasaki H1 Mach III