Editing Straight engine (section)

== Design ==
A straight engine is easier to build than an equivalent [[flat engine]] or [[V engine]], as it uses one [[cylinder head]] rather than two. Inline engines are also narrower than flat engines or V engines; however, they are longer and can be taller.

The [[engine balance]] characteristics of a straight engine depend on the number of cylinders and the [[Firing_order#Firing_interval|firing interval]].

=== Slant engines and horizontally-mounted engines ===
When a straight engine is mounted at an angle from the vertical it is called a ''slant engine''.<ref>Today's Technician: Automotive Engine Performance. Douglas Vidler. Cengage Learning, 1 Jul 2003</ref> Notable slant engines include the 1959-2000 [[Chrysler Slant-6 engine]], 1961-63 [[Pontiac Trophy 4 engine]] and the 1968-1981 [[Triumph Slant-4 engine]].

Some buses and [[diesel multiple unit]] trains take this concept further by mounting the engines horizontally (i.e. with a slant angle of 90 degrees). This is used to reduce the height of the engine, so that it can be located under the floor of the train or bus.

=== Number of cylinders ===
{{Div col|colwidth=30em}}
* [[Straight-twin engine|I-twin]] (also known as "I2")
* [[Straight-three engine|I3]]
* [[Straight-four engine|I4]]
* [[Straight-five engine|I5]]
* [[Straight-six engine|I6]]
* [[Straight-seven engine|I7]]
* [[Straight-eight engine|I8]]
* [[Straight-nine engine|I9]]
* [[Straight-twelve engine|I12]]
* [[Straight-fourteen engine|I14]]
{{div col end}}