Vortec drive belt loosens at high RPM - Page 2 - Vintage Mustang Forums
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post #16 of 19 (permalink) Old 10-17-2013, 07:01 PM Thread Starter
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Originally Posted by barnett468 View Post
ok good photos

your system is correct only cure i can think of is a new belt or if the belt only has six ribs then buy an 8 rib set up. see link below.

Pulleys / Belts | Vortech Superchargers


any answers to my other questions?

x
So I finally got the pulley sizes. Crank: 6.87". Idler: about 3". Blower: about 3"

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post #17 of 19 (permalink) Old 10-18-2013, 12:32 AM Thread Starter
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ok but how many ribs does your belt have, 6, 8 or 10?

just but a higher rib count pulley system as i suggested [or cog] and higher quality belt.

i might not run their style of cog on the street. as suggested, just call them.
6 rib belt. I'm going to do some research on running COG's on the street. It seems like the best solution. I was only able to find Cog setups for the other manufacturer. I will call them tomorrow.

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post #18 of 19 (permalink) Old 10-18-2013, 12:57 AM
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Originally Posted by flyer View Post
6 rib belt. I'm going to do some research on running COG's on the street. It seems like the best solution. I was only able to find Cog setups for the other manufacturer. I will call them tomorrow.
To be honest, a 10 rib set up should work fine on the street...............we were launching off the trans brake at 5500 and shifting at 7500 so we had a lot of trouble with belt slippage even with a 10 rib--cogs were the answer for us but a 10 rib will be fine for you. Still, I'd make the call to Vortech to be sure.

Steve,



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post #19 of 19 (permalink) Old 10-18-2013, 01:28 AM
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Originally Posted by barnett468 View Post
why did my 6 rib novi not slip at 12 lbs boost at 6800 rpm?
With only making 12 lb at 6800 you must of had a fairly large blower pulley or, a larger crank puley--guessing a 3.10 or even a 3.33 (blower). With either one of those you had a lot of belt "wrappage" on that pulley--hence very little, if any slippage. Generally, the smaller pulley you go to, the more slip you get. You can go to 8 and 10 ribs to help it as you go to the smaller pulley but eventually all of us go to a cog--if class rules allow.



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Last edited by Rebel Racing; 10-18-2013 at 03:06 AM.
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