belts for underdrive crank pulley???

[randy'sho]

getting ready to install my new lightweight crank pulley and change my belts....does anyone know what belts are recommended for the new pulley> thanks in advance~

 

[1993MTXSHO]

did you try the stock belts? I know people say you need the UDP belts but I have a 3 pulley kit and mine went on fine (little fighting but they are on and tightened to where they should be). You might be able to get the stockers on and just tighten the tensioners up a bit more, but I could be wrong maybe with the UD crank pulley the belts are just to loose.

 

[AREA 91]

Gates K060455 6 rib alt/ac
Gates K040510 4 rib ps/wp
These are for the old SHO SHOP 3 piece pulley's

 

[1993MTXSHO]

and he got those right from his memory, yes he has the sickness.

 

[randy'sho]

yeah all that i am installing is the lightweight crank and my stock belts are cracked so i am going to change them and wasn't sure if i need to change belt sizes?

 

[shobote]

Stock replacement belt works fine; I have 2 UD pullies and run a stocker.

 

[randy'sho]

that's what i needed to know...thanks man!

 

[randy'sho]

ordered stock gatorback belts for my new underdrive crank pulley and it is not even close with my tensioners all the way extended! does anyone actually know what belts work!!! looks to be off my 2-3 inches!

 

[randy'sho]

bump!

 

[luigisho]

Do you know the size difference with the crank udp? Other pulleys are stock?

 

[randy'sho]

other pulleys are stock! underdrive crank pulley is 1.5 inches smaller than stock!

 

[luigisho]

You can guesstimate how much less length you need and then go to somewhere like here http://www.gatespowerpro.com/Comerg...AdvSearch=false&CFID=1991222&CFTOKEN=71721691

and hit the browse link to look through the catalog. You go to the catalog and compare belt length and see what fits your needs.

The Gates KO4 is the 4 rib and the KO6 is the 6 rib belt.

 

[randy'sho]

i can't believe that nobody with the group buy of underdrive crank pulley's has chimed in yet!

 

[randy'sho]

any ideas before i go back and just get shorter belts???

 

[shobote]

I have the SHOshop crank and Water pump UDP's and have a stock belt on my '89; I do have the longer belt here somewhere that came with the set of 3 UDP's rom SHOSHop, and could sell that to you if you need it; I returned the alternator UDP since it did not fit, but can't understand why the stock belt would not fit with just the crank pulley on yours.

 

[randy'sho]

not sure why either! i adjusted the tensioners to the max and they were still way too long.....the underdrive crank pulley is 4.5" compared to the stock 6" pulley...

 

[randy'sho]

okay well i figured it out!

 

[luigisho]

You just need to get a belt that will accomodate that. Make sure you have a ballpark figure of how much extra space you have. Alot of us stayed away from the crank pulley and only got the u/d accessory pulleys which were larger diameter not smaller diameter like your crank pulley. That's why there's not as much response. We mostly had what Area 91 referred to.

 

[luigisho]

okay well i figured it out!

and????

 

[shobote]

You just need to get a belt that will accomodate that. Make sure you have a ballpark figure of how much extra space you have. Alot of us stayed away from the crank pulley and only got the u/d accessory pulleys which were larger diameter not smaller diameter like your crank pulley. That's why there's not as much response. We mostly had what Area 91 referred to.

The UDP crank pulley is direclty connected to the rotating assembly and much lighter than the stocker; I definitely noticed quicker revving after installing it. It is a worthwhile upgrade, and unless you have installed one and seen the improvement, you would not know how well it works on your car.