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Problem with belt squeal at high RPM's

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Old Jul 16, 2006 | 06:14 PM
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Default Problem with belt squeal at high RPM's

I think I may be answering my own question so I guess I am looking for confirmation, but if I am getting a belt squeal at about 8K though red line, do I need to have the SC belt tightened?

Could it be something else? This just started Saturday at an autoX after installing Krank Vents. I have run other autoX's at WOT and hit the limiter and never heard the squeal before.
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Old Jul 16, 2006 | 06:44 PM
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would be a good guess, check out xvipers way of doing it

https://www.s2ki.com/forums/index.php?showtopic=115118
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Old Jul 16, 2006 | 06:46 PM
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Check both sides of the belt and the pulleys for any oil contaminants. Also look to see if the belt appears particularly shiney and the general condition of it.
Before you tighten it up, do the prescribed test on it. There's been too many people who have shredded a blower belt from tightening too much. Here is the file from Comtech:
http://www.comptechusa.com/store/media/ins...S2K_SC_2005.pdf
You will find it on page 5, last point under "blower install". It says about 0.5" deflection of the belt with a 20# pressure on it. I think you should be able to grab the belt at mid-point along a convenient location and twist it. It should not go beyond about 90 degrees twist without extreme force.
If it checks out right, then you may be in need of a new belt.
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Old Jul 16, 2006 | 06:51 PM
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Thanks guys, I will give it a try.
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Old Jul 16, 2006 | 06:55 PM
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I can twist it just a little past 90 degrees in the middle, but I have to really try to do it. Minimal effort will get it to twist to 90 degrees.

No oil on the belt that I can find.
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Old Jul 16, 2006 | 08:10 PM
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Off hand, I would say don't risk a tightening at this time. How's the "shine" on the belt. Since it gets contact on both sides, you can check the smooth side for "shine" and the bumpy side for lost bits of rubber.
Can you distinguish between a squealing belt and a sqeaking pulley? If pulley, you might try to very carefully squirt a bit of silicone spray into the center of the tensioner pulley. That's about the only one I would suspect could make a squeaking noise. The blower pulley is on a shaft and heavy bearing and would tend to sound like grinding or rubbing when its on the way out. Is your tensioner pulley made out of plastic?
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Old Jul 16, 2006 | 08:23 PM
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If you lube the belt it will stop squealing....

But seriously, good luck! You could always try just replacing the belt and seeing if the problem goes away.
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Old Jul 16, 2006 | 09:07 PM
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Originally Posted by mikegarrison,Jul 16 2006, 10:23 PM
If you lube the belt it will stop squealing....
Mike, it has been my understanding that serpentine type belts (where both sides make contact with pulleys during their path of travel) should not be "lubed" or have belt dressing applied to them. Traditionally, it has only been the "V-belt" that dressing was used. Do you have newer information?
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Old Jul 16, 2006 | 09:55 PM
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You can try using a Goodyear Gator Back belt if not done so yet. They have a little more "bite" than your standard belt.
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Old Jul 16, 2006 | 10:13 PM
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Originally Posted by xviper,Jul 16 2006, 10:07 PM
Mike, it has been my understanding that serpentine type belts (where both sides make contact with pulleys during their path of travel) should not be "lubed" or have belt dressing applied to them. Traditionally, it has only been the "V-belt" that dressing was used. Do you have newer information?
No sorry, I was joking. You don't want the belt to slip!
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