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The Terminator
Engine/Tuning
New Rpm belt killing alternator bearings?
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<blockquote data-quote="fishpick" data-source="post: 15930648" data-attributes="member: 182347"><p>Yeah - these belts seem to be very solid in terms of performance... BUT - they also seem to be royal pains in the @$$ to tension correctly. Gates, Whipple, etc all have "slightly" different opinions about it.</p><p>The issue is the armird (spelling sucks) core and the utter lack of stretching... </p><p>A regular belt you tension tight... like 75% of the tensioner travel to "fully tensioned" - and when you jam on the accelerator the belt stretched, the tension takes up the slack and if you had a snapshot it might be at only 10-20% of "fully tensioned" at WOT. When you get off the throttle the belt contracts and the tensioner snaps back to 80-90% and then idles at your set 75% of full.</p><p>These RPM's are backwards from conventional behavior... You want to tension them about as loose as you can and NOT get slippage. That's the key. Because when you jam on the accelerator to WOT the belt won't stretch so the core won't let it... but when you let off fast (like everyone does) the belt's momentum will make it "sluff" forward and the tensioner if at the typical 75% can hit the "full tensioned" and when it slaps back on the belt - because it's got no give - the cords in the core snap - and the belt snaps a short while later.</p><p>Last year the Gates RPM guys gave me very explicit direction which basically amounts to tension the belt about as little as you can to achieve no slippage at WOT.</p><p>your mileage may vary - ever car is different <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="fishpick, post: 15930648, member: 182347"] Yeah - these belts seem to be very solid in terms of performance... BUT - they also seem to be royal pains in the @$$ to tension correctly. Gates, Whipple, etc all have "slightly" different opinions about it. The issue is the armird (spelling sucks) core and the utter lack of stretching... A regular belt you tension tight... like 75% of the tensioner travel to "fully tensioned" - and when you jam on the accelerator the belt stretched, the tension takes up the slack and if you had a snapshot it might be at only 10-20% of "fully tensioned" at WOT. When you get off the throttle the belt contracts and the tensioner snaps back to 80-90% and then idles at your set 75% of full. These RPM's are backwards from conventional behavior... You want to tension them about as loose as you can and NOT get slippage. That's the key. Because when you jam on the accelerator to WOT the belt won't stretch so the core won't let it... but when you let off fast (like everyone does) the belt's momentum will make it "sluff" forward and the tensioner if at the typical 75% can hit the "full tensioned" and when it slaps back on the belt - because it's got no give - the cords in the core snap - and the belt snaps a short while later. Last year the Gates RPM guys gave me very explicit direction which basically amounts to tension the belt about as little as you can to achieve no slippage at WOT. your mileage may vary - ever car is different :) [/QUOTE]
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New Rpm belt killing alternator bearings?
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