Editing VR6 engine (section)

== Description ==
[[File:Kleppen_VR6-motor_12V-contrast.PNG|thumb|right|Diagram showing the differences in port lengths between a V6 and VR6]]
VR6 engines share a common [[cylinder head]] for the two banks of cylinders. Only two [[camshaft]]s are needed for the [[engine]], regardless of whether the engine has two or [[Multi-valve|four valves]] per cylinder. This simplifies engine construction and reduces costs.

Since the cylinders are not located on the centreline of the combined cylinder head, the lengths of the [[intake]] and exhaust ports are different for each bank. Without compensation, these varying port lengths would result in the two banks of cylinders producing different amounts of power at a particular engine RPM. The difference in port lengths are compensated for with the length of the runners in the [[intake manifold]], the camshaft overlap and lift profile, or a combination thereof.{{citation needed|date=November 2019}}
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