Straight-6

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.

See also: straight engine