5.7 '93 - Move Tensioner to Slack Side of Belt?

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Wildblue19

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Hello everyone,
I've got some belt slip issues on my dual-AC compressor serpentine setup.

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When the AC head pressure is high and the compressors are hard to turn, my serpentine belt stretches. Enough slack is in the belt when this happens that on the slack side of the crank (between the crank pulley and compressor pulley) it will sometimes slip.

It got me wondering why the OE tensioner is on the tension side of the belt to begin with. OE setup:

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Dual AC Setup with added tensioner on slack side (note that as it is installed right now, there is only an idler where the 2nd tensioner pulley is pictured below):

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Obviously the factory single compressor setup works fine, but not for my special case. Is there any reason why if I were to pin the OE tensioner in place, a slack side tensioner wouldn't work? Is pinning the OE one in place even necessary (IE running 2 tensioners)? TIA!
 

docstoy

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How much does your belt stretch . On belt setups like this if someone installed a belt just a little longer to make it easier to change that could be just enough that when belt seats in pulleys that it's now to long. Serpentine belts don't usually stretch they wear on contact or grooved side .
 

Wildblue19

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Of course it's difficult to measure as it only happens when running. But it goes from taut to deflecting about a half inch either direction as it flops around
 

Wildblue19

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I captured this image from an AC retrofit kit someone had done. This is the same tensioner and location I plan to use on mine
 

docstoy

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Does it show what's happening on alternator side ? How much space do you have between your tensioner now when installing a new belt ? You need someone else to chime in that has seen this dual comp. setup , or install an idler pulley on slack side just not sure.
 
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