Two-stroke engines Īn even-firing six cylinder two-stroke engine requires ignitions at 60° intervals or else it would run with simultaneous ignitions and be no smoother than a triple in power delivery. As engine reciprocating forces increase with the cube of piston bore, the straight-six is a preferred configuration for large truck engines. The engine balance characteristics of a straight-six engine compare favourably with the more common straight-four engines and V6 engines, which experience significant secondary dynamic imbalance, resulting in engine vibration. The secondary balance is due to the crank throws being arranged in three planes offset at 120°, which results in the non-sinusoidal forces summing to zero for all free forces up until the sixth order.

The primary balance is due to the front and rear trio of cylinders move in pairs (albeit 360° out of phase), thus cancelling out the rocking motion present in a straight-three engine. In an appropriate firing order is used, a straight-six engine has perfect primary and secondary engine balance. Engine balance and vibration ģ890-litre MAN B&W 6S60MC marine diesel engine Due to its well balanced configuration, the straight-six can be scaled up to very large sizes for heavy trucks, locomotives, industrial and marine use.

Straight-six engines are typically produced in displacements ranging from 2 to 4 L (122 to 244 cu in), however engines ranging in size from the 0.7 L (43 cu in) Benelli 750 Sei motorcycle engine to the 6.7 L (409 cu in) Cummins B Series engine pickup truck engine have also been produced. In terms of packaging, straight-six engines are usually narrower than a V6 engine, but longer than straight-four engines and V6 engines.

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