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A V engine is a common configuration
for an internal combustion engine in which the
pistons are aligned so that, if viewed along the line of the crankshaft, they appear to be in a V. The V configuration reduces the overall engine length and weight
compared to an equivalent straight engine.
Some V configurations are well-balanced and smooth, while others are less smoothly running than their equivalent straight
counterparts. Some designs, such as the V8, V12 and V16 are smooth running and balanced, while others, such as the V2, V4, V6 and
V10 show increased vibration and generally require balancing shafts. Some exceptions occur with certain crankshaft
configurations.
Various angles of V are used in different engines; depending on the number of cylinders, there may be angles that work better
than others for stability. Very narrow angles of V combine some of the advantages of the V engine and the straight engine (primarily in the form of compactness) as well as
disadvantages; the concept is an old one pioneered by Lancia, but recently espoused by
Volkswagen.
It is common for V engines to be described with V# notation, where # is how many cylinders it has:
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