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Straight engine

Usually found in 4 and 6 cylinder configurations, the straight engine or in-line engine is an internal-combustion engine with all cylinders aligned in one row, with no or only minimal offset. The straight-4 is by far the most common 4 cylinder configuration, whereas the straight-6 is slowly giving way to the V6, which requires less space. Some manufacturers, such as Audi, VW or Volvo, also used straight-5 configurations.

Straight configurations are simpler than their V-shaped counterparts and usually provide smoother running. There has been an advance by VW to combine the advantages of both configurations in an engine called VR6 (V to indicate the V shape and R for "Reihenmotor" (German for straight engine)). This was pretty much a V engine with a very narrow cylinder angle (15 degree), which allowed to combine the smaller size of the V6 engine with the smoother run of the straight-6.

Straight-6 engines can still be found in cars like the Australian Ford Falcon[?] and the BMW 6-cylinder models.

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