90mm and 100mm idlers??

[SVT32VDOHC]

I have a 2004 Cobra with a 2.3L Whipple and a 3.00" pulley. ALL other pullies are stock. The car has a Goodyear Gatorback 4080740 eight rib belt. I would like to buy an idler to get more belt wrap. Which one should I buy? 90mm or 100mm? Can I use either of these with the belt that I have? If not, what belt size will I need? BTW...I like lethal performances site and I like the Billet Flow brands if that counts.

Thanks guys. I just got this car (first Termi) and it won't be driven til spring. I'm trying to get a list of needed parts. :rockon:

 

[TORQJNKY]

My set up is Whipple with a 3.0 Upper, (3) 100mm idlers and (1) 92mm idler. The 92mm idler is in the spot near the belt tensioner with one of the 100mm pulleys on the snub idlers. Lethal's Billetflow kit is great. I use a Gates belt K080765. My recommendation is to buy a couple of belts, find the one that fits right and return the one that doesn't. Hope this helps.

 

[SVT32VDOHC]

My set up is Whipple with a 3.0 Upper, (3) 100mm idlers and (1) 92mm idler. The 92mm idler is in the spot near the belt tensioner with one of the 100mm pulleys on the snub idlers. Lethal's Billetflow kit is great. I use a Gates belt K080765. My recommendation is to buy a couple of belts, find the one that fits right and return the one that doesn't. Hope this helps.

Thanks for the reply. I don't think I'm gonna spend the 250 on the whole kit. I just want to get that one idler that everybody seems to have next to the blower. Just wondering if I can use my current belt with just the addition of one pulley. I would think I could because doesn't that just push down on the belt giving it more wrap?

Motor pic as it is now.

 

[TORQJNKY]

It does push the belt in more but if you don't have enough room on your tentioner to compensate for that you will still need a longer belt. Does your car have a cog belt drive system? It looks like your belt is a cog belt in the pic of your engine.

Check out CobraBob's belt selection guide. It might help out a little.
Belt Selection Guide.

 

[CobraBob]

Thanks for posting the link to my Belt Selection Guide. I do see those cogs on his belt as well. Almost looks like the RPM Outlet cog kit although the upper pulley looks slightly different.

 

[TORQJNKY]

No problem Bob. Your site is one of the most informative for Cobra owners so I am always happy to do it.

 

[SVT32VDOHC]

They're not cogs, it's a Goodyear Gatorback belt, so you know how they have those aggressive ribs...

I guess I'll have to buy a couple belts as stated. Does Murrays/Autozone carry those belts. I had a nother member tell me his set up his a 3.00" Whipple pulley, the 4 peice idler kit with the 100mm idler next to the blower and he is using a 76" belt. I guess I'll just have to do a trial and error method. You want it pretty tight right??

 

[TORQJNKY]

Napa Autoparts sells the Gates Belts. With a Whipple, you should notch your tensioner tab so you can get a little smaller belt on. You don't have to but it will give you about a 1/2" more play so you can get a smaller belt on for a little bit tighter wrap. Without the notched tension, your belt indicator should rest somewhere in the middle to upper 3/4's of the indicator section.

 

[SVT32VDOHC]

Ive heard of that. Just the tab you have to notch? Gotta pic handy?

 

[TORQJNKY]

Here you go. My pulley bridge is off my car right now so it made it easy. You can cut the whole tensioner stop off or just notch it back about halfway. I cut mine all the way off with a dremel cutting wheel. Some people just knock it off with a screw driver and hammer :dw:.