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.