V4 engine
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A V4 engine is a four-cylinder piston engine where the cylinders share a common crankshaft and are arranged in a V configuration.
1990-2002 Honda ST1100 longitudinally-mounted V4 engine
1960–1994 ZAZ Zaporozhets aircooled V4
1963–1976 Lancia V4 engine
1970-1974 Ford Taunus V4 engine (in a Saab Sonett 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