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Straight-6

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The straight-6 or inline 6 is an internal combustion engine with six cylinders aligned in one row.

Straight-6 engines have perfect primary and secondary balance.

Usually a straight-6 is used for engine sizes between about 2.5 and 4 litres. Sometimes this configuration is used to make smaller engines which tend to be powerful and very smooth running, but also rather expensive to manufacture and physically longer than alternative layouts.