Belt slippage advice

[still03cobra]

When it had the stock pulley and belt and my handheld car ran very strong. Now that I have put on a billetflow 2.76 pulley with 100mm snub idler and I believe 74.5 gates belts which was recommended. I now have slippage. I don't get it. They dyno shop said I need a new caged lower setup because that what my issue was. But it never slipped before that.

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[rymax101]

On the tensioner where is the mark at compared to the blocks

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[still03cobra]

Sorry I'm not to sure. How could I find out? Lol I just got the parts and had them put on. I got the idler just because I was told it would help with belt slippage.

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[cmac29]

You want the tensioner mark as close to the middle of the notches as possible. This is so you know the tensioner putting as much tension as possible.

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[cmac29]

Some people have had to grind the notches because of needing a belt to be a little shorter or longer.

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[bigmoose]

According to cobrabobs site you should be using a 73.5" belt. As most women know an inch makes a difference.

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[still03cobra]

According to cobrabobs site you should be using a 73.5" belt. As most women know an inch makes a difference.

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Alright cool I'll check that out.

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[still03cobra]

Thank you all for your input! I'm just a kid with a Cobra I'm still trying to learn all this stuff. I don't work on cars lol now I'm starting to realize if your gonna have a Cobra you gotta start figuring some stuff out.

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[Ryan2KRedL]

Link to Metco site for belt info.
http://www.metcomotorsports.com/supercharger_belt_length_recommendations.htm

Picture of your tensioner and the acceptable range of belt tension.

 

[still03cobra]

Ok so I would need a 74. Not the 74.5 that I've been running for months. Yeah once you start getting up in rpm's to shift it's not worth a damn. But still kinda funny to outrun guys even with the hard belt slip.

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[cmac29]

Link to Metco site for belt info.
http://www.metcomotorsports.com/supercharger_belt_length_recommendations.htm

Picture of your tensioner and the acceptable range of belt tension.

That is also a picture of the metco tensioner plate. If you get a chance do some research on that piece. It keeps the tensioner from walking fwd and causing belt slip also. I never had the issue with my ported Eaton but with my KB my tensioner moves like crazy. I have one coming to solve the issue.

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[ctgreddy]

probably just wrong belt size. I'd say it's deff NOT the lower pulley lol.

 

[cj428mach]

When you start getting to sub 3.0" belts it takes some pretty aggressive belt tension in order to prevent slip. I'd say if your tensioner still has the factory stop then it probably needs to be almost against the stop with the belt installed to prevent slip.

 

[CobraBob]

Does sound like your slippage is due to the belt being a bit too large. Are you seeing a lot of black belt dust? Was the 74.5" belt installed when the auxiliary idler was installed?

 

[Buckwheat 1]

I am having the same issue. I just recently put the metco idlers on with the 100 mm snub. I order the brace just the other day. The only thing that changed was a longer belt and the 100 mm snub.

 

[cj428mach]

You really need to remove the auxiliary idler pulley when installing a belt on a small upper like that. You need the idler off, then loosen the belt with the tensioner and install idler pulley while holding the belt tensioner. If you can get the belt on with out removing the idler pulley, its to loose.

 

[Buckwheat 1]

You really need to remove the auxiliary idler pulley when installing a belt on a small upper like that. You need the idler off, then loosen the belt with the tensioner and install idler pulley while holding the belt tensioner. If you can get the belt on with out removing the idler pulley, its to loose.

You should do that with 3 in pulley on SC also?

 

[Bdubbs]

You should do that with 3 in pulley on SC also?

If belt slip is present, yes. I've had to do it that way all the time with a aux idler pulley. Not anymore with this whipple setup.

 

[Buckwheat 1]

If belt slip is present, yes. I've had to do it that way all the time with a aux idler pulley. Not anymore with this whipple setup.

Thanks
Is that tensioner from whipple still available?

 

[Bdubbs]

Thanks
Is that tensioner from whipple still available?

Not sure. Lately they been only making a couple at a time. Expensive setup, but you can basically use the same belt for different pulleys. Member had one for sale in the market section.