MMS Pulley, Belt Snapped
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
MMS Pulley, Belt Shredded Just installed my MMS pulley with the ATI 4.10 pulley.
Tighten the belt so it would twist 90 degrees.
Took it for a test drive, was able to hit 6-7#
After the 3rd run. Belt was shredded. I made sure I installed the ATI pulley the correct way. Did I tighten it too tight?
Tighten the belt so it would twist 90 degrees.
Took it for a test drive, was able to hit 6-7#
After the 3rd run. Belt was shredded. I made sure I installed the ATI pulley the correct way. Did I tighten it too tight?
Last edited by Ed Blown Vert; Jun 6, 2004 at 08:31 PM.
Originally Posted by Ed Blown Vert
Just installed my MMS pulley with the ATI 4.10 pulley.
Tighten the belt so it would twist 90 degrees.
Took it for a test drive, was able to hit 6-7#
After the 3rd run. Belt snapped. I made sure I installed the ATI pulley the correct way. Did I tighten it too tight?
Tighten the belt so it would twist 90 degrees.
Took it for a test drive, was able to hit 6-7#
After the 3rd run. Belt snapped. I made sure I installed the ATI pulley the correct way. Did I tighten it too tight?
Just check the tightness of the belt..... it might of been to tight.
Kyle
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Belt was shredded. 
But I think the part number is 4060407
I will try getting another one and not tighten it as tight.
Anything else that could shred it? I am pretty sure I got the crank bolt tight. Busted my Flex-Handle
But I think the part number is 4060407I will try getting another one and not tighten it as tight.
Anything else that could shred it? I am pretty sure I got the crank bolt tight. Busted my Flex-Handle
Last edited by Ed Blown Vert; Jun 6, 2004 at 08:31 PM.
Is it shredded or ripped in half. If it shredded, likely it was a little loose and the set-up spun faster than the belt. I lived that deal for a while before I went to the Cog R&D program. You may want to pick your boost level and order a Reichard Racing Ultragrip Pulley. I made 12PSI with no slip on an MMS and 3.5 Ultragrip.
Mark
Mark
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Ok, I installed another belt. But it looks like the MMS pulley sits deeper in the crank. Making the alignment of the belt off. Any suggestion to lining them up??
Last edited by Ed Blown Vert; Jun 7, 2004 at 10:06 AM.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Moderator
Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
Definitely check the alignment between pulleys.
Also, when you put a new belt on, tighten it where you can bend it about 90 degrees or so with you rfingers, then run it for 5 minutes or so. Stop the car. Tighten it the same way, again. Drive it a bit... only WOT for a little, a couple times. When you get home, tighten it once more before you start trouncing on it.
When I've had a belt shred to pieces, it was because of alignment. But, I could see abnormal wear before hand. Later, I saw the belt was actually hitting the outer lip of the idler (bracket side).
Also, I had to space my MMS pulley by one washer, which tells me the thickness was slightly less at the bolt-on point than the ATI pulley. On hte flip side, I had to re-align the pulleys by spacing my SC bracket with washers when I installed the Superdamper.
Finally, try Goodyear Gatorback (not to fix your problem, just for longevity in general). Those are the toughest belts I've used.
Also, when you put a new belt on, tighten it where you can bend it about 90 degrees or so with you rfingers, then run it for 5 minutes or so. Stop the car. Tighten it the same way, again. Drive it a bit... only WOT for a little, a couple times. When you get home, tighten it once more before you start trouncing on it.
When I've had a belt shred to pieces, it was because of alignment. But, I could see abnormal wear before hand. Later, I saw the belt was actually hitting the outer lip of the idler (bracket side).
Also, I had to space my MMS pulley by one washer, which tells me the thickness was slightly less at the bolt-on point than the ATI pulley. On hte flip side, I had to re-align the pulleys by spacing my SC bracket with washers when I installed the Superdamper.
Finally, try Goodyear Gatorback (not to fix your problem, just for longevity in general). Those are the toughest belts I've used.
Moderator
Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
I did not put a washer between the damper and the CP. Sorry... I just read what I wrote and it does sound that way. I put an extra washer on the bolt to keep it from bottoming out.
Any spacing I have done has been with the bracket and supercharger pulley.
Any spacing I have done has been with the bracket and supercharger pulley.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
According to EFI, on the runs I torn the belt. I touched the rev limiter @ 6800. Even though I had the shifts set @ 6200.
I am going to double-check EDIT, and set the shifts to 6000. I would rather bring boost in sooner and not shift so high.
Even though I had the shifts set @ 6200.I am going to double-check EDIT, and set the shifts to 6000. I would rather bring boost in sooner and not shift so high.
Moderator
Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
I have found that the higher my boost, the faster the engine will rev, the more it will overshoot the shift points.
Make sure your RPM AND your MPH thresholds are reached for your desired shiftpoints (both are required before shift occurs).
If you set the MPH thresholds quite low, all you have to worry about is setting the RPM thresholds to fine-tune your shiftpoints. Start at around 200 to 300 RPM's lower than where you want it to shift the A4.
Hope that helps.
Make sure your RPM AND your MPH thresholds are reached for your desired shiftpoints (both are required before shift occurs).
If you set the MPH thresholds quite low, all you have to worry about is setting the RPM thresholds to fine-tune your shiftpoints. Start at around 200 to 300 RPM's lower than where you want it to shift the A4.
Hope that helps.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
I got the shifts down to 6200. Weird that I had to change them. Ran these shift points on a 150 shot.
Tighten the belt last night drove it for a few. Tighten it again.
Let it sit overnight, drove it in the morning. Tighten it again.
WOT blast and ate another belt. Argggg!!
I was hoping to get this to work before my Fri dyno. Guess I will be going back to the stock pulley.
Tighten the belt last night drove it for a few. Tighten it again.
Let it sit overnight, drove it in the morning. Tighten it again.
WOT blast and ate another belt. Argggg!!
I was hoping to get this to work before my Fri dyno. Guess I will be going back to the stock pulley.
Last edited by Ed Blown Vert; Jun 7, 2004 at 03:33 PM.
Moderator
Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
This procedure has given me longevity for my belts, but doesn't fix misaligned pulleys, siezed idlers, etc. You still have to align the pulleys.
I shredded one before I aligned my Superdamper. It was literally link a tiger raked it to shreds. Once I got it aligned, it has run fine. If you can eyeball a misalignment, it definitely needs work.
Don't rush it. That's the worst thiing you can do. I know; I've been there. I disregarded my own advice and did exactly the thing you just did. I went back and at least got what I needed to align it correctly.
I shredded one before I aligned my Superdamper. It was literally link a tiger raked it to shreds. Once I got it aligned, it has run fine. If you can eyeball a misalignment, it definitely needs work.
Don't rush it. That's the worst thiing you can do. I know; I've been there. I disregarded my own advice and did exactly the thing you just did. I went back and at least got what I needed to align it correctly.
Moderator
Joined: Nov 2001
Posts: 3,048
Likes: 12
From: Raleigh, NC
If it is ripping it like that, you should also see fraying at the edge after regular driving. I actually cranked up and crawled under the car enough to see how it's tracking. That helps too. If it looks like it's trying to ride up the SC pulley to jump a rib, or the belt is touching the outer lip of the idler, you need to shim it.
I was able to shim it pretty accurately by making sure it was running perpendicular across the idler. At first, mine was touching the lip of the idler. I couldn't tell after install, but I could tell when it was cranked and running.
I had to get the idler off my alternator belt. Then, since my Superdamper/ATI 8-Rib was a tad farther out, I had to move the bracket out that much AND shim the SC pulley back into alignment with the CP.
I was able to shim it pretty accurately by making sure it was running perpendicular across the idler. At first, mine was touching the lip of the idler. I couldn't tell after install, but I could tell when it was cranked and running.
I had to get the idler off my alternator belt. Then, since my Superdamper/ATI 8-Rib was a tad farther out, I had to move the bracket out that much AND shim the SC pulley back into alignment with the CP.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Yes the pullies are mis-aligned. The SC is sitting too far to the front of the car. For me to align it, I would need to grind the standoffs.
Since I need the car to get to work. I will have to put back the stock ATI CP till I can figure out how to fix it. Unless I can do it tonight. I just don't understand why the stock CP worked fine. Unless it sticks out further.
Since I need the car to get to work. I will have to put back the stock ATI CP till I can figure out how to fix it. Unless I can do it tonight. I just don't understand why the stock CP worked fine. Unless it sticks out further.