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The engine in a vehicle is mounted on rubber motor mounts, the centrifugal force of the internal workings of the engine cause it to lean to one side, it is thus shifted from its originall position, so the belt will have to compensate for the movement, that is why the belt is always a little big for the run it has to do, and is tighteded up with a tensioner.

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Q: Why does your serpentine belt at high rpms twist a bit on the long runs between pulleys?
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