cwylie

iTrader: (2)

Had maybe 15 min of run time on it and no miles on the road as I just started the motor. I was blipping the throttle maybe 2.5k-3k rpm not sustained rpm using my hand to turn the throttle body cam (I know its kinda stupid but we have all done at at one point or another) and the belt let go. Bad belt or do I have a larger issue.

lmt0705

iTrader: (7)

pulley alignment

JRENIGAR

iTrader: (37)

Looks like it was making contact on the back side of the belt where the frayed part is. I had a zero turn mower do this once.

LS1-IROC

iTrader: (4)

Looks like physical contact with a sharp object they way that it is sliced.

cwylie

iTrader: (2)

Yeah that's what I thought too but I can't find anything it could have hit and it came apart in a split second with no sign of anything starting to give

hellbents10

iTrader: (10)

Alignment will do that, and also bracket flex under load causing miss-alignment.

MyFirstLS1

iTrader: (8)

Had a crank pulley do that to me before. As soon as I started the car it jumped a tooth

mistafosta

iTrader: (9)

What this guy said. Check your pulley setup with a laser or straightedge!

cwylie

iTrader: (2)

Checked the alignment and everything looks good. I could not find anything that cut the belt. I put a new gates belt on it and everything seems to be good so far. I think I just got a bad belt.

jtotheizzo

Mine was doing this as well. It looks to me like it was some rust that was on the idler. It was a little rough on the back. So I sanded the idler down to make it smooth and all seems well at this time.

Bob@BruteSpeed

iTrader: (16)

I agree. A lot of people don't ever know just how much a bracket can flex until they're watching it on a dyno. Bob

cwylie

iTrader: (2)

Yeah I am hoping it was not flex as the engine was only being reved and not under any load. If it turns out to be flex I will be a little disappointed as it is a expensive billet setup for an LSA.

Beanslsxnova

iTrader: (1)

My belt does that after a few 7k rpm pulls. If I drive normal it has no problems. i can't figure it out either, but flex would make since

mistafosta

iTrader: (9)

Like Bob said, flex is commonly the issue for this. Especially on blowers. What is your setup?

ICRAZY6

iTrader: (68)

I had the same issue. I put a new belt on and took it for a spin only to have it shred the belt after 5 min. I went and got a new tensioner and haven't had problems since.

Beanslsxnova

iTrader: (1)

A 4.8 with truck acc. I'm not running power steering so the belt has to travel from the crank pully all the way to the alt. the last time it shredded i snipped off the one riv so now it's basically a 5 riv belt. it's been good for a 1000 miles or so with lots of 7-7500 rpm pulls

spray280

iTrader: (5)

I had a fresh dayco belt explode for lack of a better term. Bought
a goodyear gatorback & haven't had anymore trouble.

cwylie

iTrader: (2)

It was a gatorback belt that came apart on me. I have run it with a gates belt and no issues thus far. The setup is from C1 for a LSA.

cwylie

iTrader: (2)

So I have not had another belt fail but I do have some flex for sure. The alternator and power steering pump are attempting to get closer together under load. What is considered an acceptable amount of flex.

JRENIGAR

iTrader: (37)

Thats beautiful. I wish my Denali had that setup on it.