Quote:
Originally Posted by bensenvill
Frank, if your putting on larger pulleys, you are also putting in a longer belt, you are NOT increasing the tension of the belt. (the purpose of the idler pulleys is to take in that extra slack, keeping a constant tension).
Overdrive pulleys are typically around 10% larger (it entirely depends on clearances), and almost always milled out of aluminum, so they are considerably lighter than the stock thats being replaced.
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If you're putting on larger pulleys, you're increasing the angular momentum that the pulley carries, making it more difficult to turn because of increased weight further from the center, and because of increased drive ratio.
I'm not sure where anyone said anything about overdrive pulleys, though, other than in jocularity, a few posts back.
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