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Old 03-14-2013, 11:56 AM   #1
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Default 2.76 Pullied Cobra with Idler - belt question

Right now I have a 75.1 inch Gates belt on the Cobra which is a pretty tight fit and barely makes it onto the pulleys at it is. This is the size belt recommended by Billetflow when I got the pulleys.

I need to replace the belt and I was thinking about going with a 75.59 inch belt which is about a 1/2 inch longer. The idea is to release a bit of the strain that is on the pulleys and tensioner. It doesn't seem like such a small increment would matter, but I wanted to check here first, just in case there is something I'm missing.

What do you guys think?
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Old 03-14-2013, 11:59 AM   #2
 
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What is the tensioner telling you? Check that first to see if it really is too tight.

I had a HELL of a time with belts on my cobra. Greasy can chime in on that
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Old 03-14-2013, 12:05 PM   #3
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The tighter the better. As soon as the car starts it all loosens up.
Trust me.
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Old 03-14-2013, 12:27 PM   #4
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The tighter the better is right, but too tight can cause the most fucking annoying high pitch noise you can imagine. Pulley alignment also plays a roll and we had some success with the Goodyear Gatorback belts.
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Old 03-14-2013, 12:28 PM   #5
 
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Old 03-14-2013, 12:48 PM   #6
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Also a good belt reference guide....

Belt Guide
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Old 03-14-2013, 01:04 PM   #7
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you might end up with belt slip and loosing a little boost
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Old 03-14-2013, 01:05 PM   #8
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The 03 Cobra Blower belt drive system is one of the worst engineering failures ever IMHO.
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Old 03-14-2013, 01:07 PM   #9
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worst engineering failures ever?

even tho it works on a stock vehicle probably pretty well most of the time?
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Old 03-14-2013, 01:09 PM   #10
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worst engineering failures ever?

even tho it works on a stock vehicle probably pretty well most of the time?
The location of the alternator, the insane amount of pullies and complete cluttering up of the front of the engine compartment.
I stand by my statement!
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Old 03-14-2013, 01:10 PM   #11
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It doesnt even work well when stock, stock idlers explode for no reason lol
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Old 03-14-2013, 01:10 PM   #12
 
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Shit sucks

Theres like 45 pulleys.
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Old 03-14-2013, 01:11 PM   #13
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worst engineering failure is sort of an exaggeration
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Old 03-14-2013, 01:21 PM   #14
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worst engineering failure is sort of an exaggeration
Your cars an exaggeration! OH SNAP!!
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Old 03-14-2013, 01:32 PM   #15
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Default Re: 2.76 Pullied Cobra with Idler - belt question

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Your cars an exaggeration! OH SNAP!!
It is?
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Old 03-14-2013, 07:20 PM   #16
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If you dont care about a loose belt then yeah you can get a longer belt.
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Old 03-14-2013, 07:24 PM   #17
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Quote:
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The 03 Cobra Blower belt drive system is one of the worst engineering failures ever IMHO.
i concur, that bracket for the 01 timing covers is amazing, Blower, Idler, Crank, done

I keep telling Johnny its more proficient cause theres less belt wrap around idlers and such, maybe im wrong though
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Old 03-14-2013, 08:02 PM   #18
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Not a fan of the blower belt drive system on the Cobras either, it took me almost 2 years to find the perfect match of billetflow pulleys and belt to have it running without beltslip and without any squeaking. The stock pulleys are absolute garbage too.
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Old 03-14-2013, 09:09 PM   #19
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It is?
Indeed
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Old 03-16-2013, 07:41 AM   #20
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Not a fan of the blower belt drive system on the Cobras either, it took me almost 2 years to find the perfect match of billetflow pulleys and belt to have it running without beltslip and without any squeaking. The stock pulleys are absolute garbage too.
So what's the combination?

I have belt squeak too and I'm getting tired of changing belts every 8 months because of it. Granted, my squeak is not too loud and goes away after about 2 minutes, but it's still annoying. Certainly nothing like Mook's video above.

I need a proven solution.

Gonna try a Dayco belt, but I might go a 1/2 inch longer to try and reduce the strain on the pulley's.
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Old 03-16-2013, 09:59 AM   #21
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Look at the belt guide I posted above and find your exact combo/belt size on the chart. Buy 2 belt sizes above and below that recommendation and test all to see what produces the best results. Return the other 4 afterwards.
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Old 03-16-2013, 10:15 AM   #22
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So what's the combination?

I have belt squeak too and I'm getting tired of changing belts every 8 months because of it. Granted, my squeak is not too loud and goes away after about 2 minutes, but it's still annoying. Certainly nothing like Mook's video above.

I need a proven solution.

Gonna try a Dayco belt, but I might go a 1/2 inch longer to try and reduce the strain on the pulley's.
I tried various belts with the stock pulleys, tried belts with steeda pulleys, and tried belts with the current Billetflow pulleys I have on now, which haven't made a sound since summer of 2011.

My current setup is the Billetflow 4 Pulley snub Idler Kit (3-100mm pulleys and 1-92mm pulley) and a 75.5 gates belt you can buy at NAPA. Put a 100mm pulley on the idler bracket instead of the 92mm one and everything will be super tight. Haven't had a squeak, beltslip, or a belt eaten up in almost 2 years.
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