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it is really easy to overtorque adjustment bolts. been there done that. Make sure to check the deflection of the belt at the longest span between pulleys. IIRC, the standard is 1" deflection per foot of span, which gives you a suprisingly loose belt.
The best belt tensioner I've seen for serpentine belts is a self adjusting spring loaded variety used extensively by GM and Ford. It keeps the belt tight, but not so much to break anything, and allows for the slight stretching a belt can experience over time. That and it's more or less idiot proof.
Wish I could tell you how many adjustment bolts I've broken over the years. But I lost count a long time ago.
I know in industrial usage, the belt tension is loose enough to allow you to roll the belt on and off with just a bit of difficulty. I suppose it is partly due to prefering to burn a $20 belt if things get hung up than a $1000 electric motor due to the belt being so tight it won't let the motor spin if something hangs up the gear box.
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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