Straight-three engine
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A straight-three engine is a three-cylinder piston engine where cylinders are arranged in a line along a common crankshaft.
Engine block of an Elsbett straight-three diesel engine
Circa-1960 Saab two-stroke engine
2010 Suzuki K10B engine
1969–1975 Kawasaki H1 Mach III
Straight-four engine
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A straight-four engine is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft.
Diagram of a DOHC straight-four engine
1989-2006 Ford I4 DOHC engine with the cylinder head removed
2006-2009 Nissan M9R diesel engine
1908–1941 Ford Model T engine