Straight-12 engine

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A 1905 Wolseley straight-12, 360 hp, petrol or oil marine engine

A straight-12 engine or inline-12 engine is a twelve-cylinder internal combustion engine with all twelve cylinders mounted in a straight line along the crankcase. A straight-12 is a very long engine, and therefore straight-12 engines are not common in automobiles, but it has been used for large military trucks. Also, some Russian firms built straight-12s for use in boats in the 1960s and 1970s.

The Wärtsilä-Sulzer RTA96-C is offered in 12-cylinder configuration.

Reciprocating engines and configurations

Type

Stroke cycles

Configurations and number of cylinders

Single cylinder	Single Split-single

Inline / straight	I2 I3 I4 I5 I6 I7 I8 I9 I10 I12 I14

Flat	F2 F4 F6 F8 F10 F12 F16

V / Vee	V2 V3 V4 V5 V6 V8 V10 V12 V14 V16 V18 V20 V24

W	W8 W12 W16 W18

Other inline	H U Square four VR Opposed X

Components

Valves	Cylinder head porting Corliss Intake Exhaust Multi Overhead Piston Poppet Side Sleeve Slide Rotary valve Variable valve timing Camless Desmodromic

Fuel supplies	Carburetor Gasoline direct injection Common rail

Mechanisms	Cam Camshaft Overhead camshaft Connecting rod Crank Crankshaft Scotch Yoke Swashplate Rhombic drive

Linkages	Peaucellier–Lipkin Watt's (parallel)

Other	Hemi Recuperator Turbo-compounding

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