belt size question

[03mach1blk]

I need help finding the correct size belt size for my combo. I have a 2.80 pulley with 4pc idlers 3-100mm and 1-90mm. I broke my lower crank pulley and replace it with the lfp lower pulley kit with the stock ring. Could anyone give me the correct belt size and part number for my combo.

 

[TRBO VNM]

I bet Cobrabob's site could help. :beer:

Belt Selection Guide

 

[03mach1blk]

Ive checked that chart and the belt it suggested wasnt even close.

 

[96stanggt]

74" or 74.5"

 

[CobraBob]

Ive checked that chart and the belt it suggested wasnt even close.

Not even close? :shrug:

Please post your specific configuration in detail. I'd like to check it for myself. If the info on my Belt Selection Guide "isn't even close", then I'll change it or delete that particular configuration.

For those who don't know about the Belt Selection Guide, here is the link. Belt Selection Guide

 

[04SolidSnake]

74" or 74.5"

Without a notched tensioner, 74" would be a pretty tight squeeze.. With the 2.80, and 4 piece idler set, I am running 75" (stock size) belt. I had already squeezed a 73" belt on without the idlers, and I didn't want to buy an extra belt, and I had the stocker handy.. Works great.

Cobra Bob's site clearly states for a 2.80 upper, and 4 idlers and stock sized lower, that the belt size is 74.5 to 75. Which is bang on, so I am thinking the OP read the recommended size incorrectly.

 

[jm@ReischePerf]

I broke my lower crank pulley and replace it with the lfp lower pulley kit with the stock ring.

Just out of curiousity how did you break the crank pulley?

 

[dynobobstieg]

74.5

Stiegemeier
StiegeSplash
636-949-2275

If you want/need to notch the tensioner it is easy:
A notched tensioner will allow you to put a 1/2 inch shorter belt.
A simple and common sense way to improve torque and lessen belt slippage is to grind the pulley stop.
First move your water tank to the side and then remove center bolt. Grind the notch 3/4 back, replace bolt-then tank.

 

[mixxer]

74.5

 

[03cobra#694]

Stock 75.1'' or 74.5''.I`m running the 74.5''.

 

[dynobobstieg]

I bet Cobrabob's site could help. :beer:

Belt Selection Guide

CobraBob has a great guide to go by.
Stiegemeier.
StiegeSplash
636-949-2275

 

[CobraBob]

Thanks Bob, and to everyone who piped in. When someone posts a comment that my Guide is wrong, it gets my attention. I occasionally get an incorrect configuration from someone so having you folks confirm a configuration either way is important. I try to keep the Guide as accurate as possible.

 

[96stanggt]

Without a notched tensioner, 74" would be a pretty tight squeeze.. With the 2.80, and 4 piece idler set, I am running 75" (stock size) belt. I had already squeezed a 73" belt on without the idlers, and I didn't want to buy an extra belt, and I had the stocker handy.. Works great.

Cobra Bob's site clearly states for a 2.80 upper, and 4 idlers and stock sized lower, that the belt size is 74.5 to 75. Which is bang on, so I am thinking the OP read the recommended size incorrectly.

My tensioner have been notched and I always try with a tighter belt to prevent any slip. If its not a pain in the ass to get on, you're probably going to have slip.

 

[04SolidSnake]

LOL After trying to cram that 73" belt on, the 75" belt was a freaking breeze.. I didn't want to buy another belt at the time, since I am looking at getting a 4# lower when it warms up.