5.7stroker

iTrader: (36)

I have an ASP pulley on my car with 25% UD. Was told to replace it with an ATI and replace the timing chain for peace of mind. I've researched and have found only 2 stories of ASP being an issue and many stories saying that the ASP has been on cars for 100,000+ miles with no issues. Was there an early on quality issue with ASP that was resolved later on? Who has had issues with ASP UD harmonic balancers?

jrpimp00

iTrader: (17)

How in the world can it throw the timing chain?

Cstone812

iTrader: (5)

I've had one on my car for a few years with no issues. Car now has a new heads cam nitrous setup and will still be running it.

thunderstruck507

iTrader: (18)

I've heard of them throwing the accessory belts before a long long time ago. But I've never heard of a pulley causing an issue with the timing chain.

5.7stroker

iTrader: (36)

https://ls1tech.com/forums/generatio...n-failure.html

IDriveChevy

iTrader: (5)

If it ain't broken don't fix it.

5.7stroker

iTrader: (36)

Exactly. And if it does break, replace it with something better.

blk00ss

iTrader: (66)

I ran one for a long time. Never had a failure. But they're not a harmonic balanced like an ATI or stock is. ATI is a lot better for longevity of the bottom end.

dailydriver

^^^THIS

Gray86hatch

iTrader: (83)

The smaller the diameter is of the balancer the less ability it has to dampen harmonics. The first thing that sees stress is the chain. If is has a cam and springs and sees rpm a good balancer is not a waist of money. Buy good I mean ATI or Innovators West. It is also not just the dia but the stiffness of the rubber. Never a one size fits all.

Tim

03Sssnake

iTrader: (20)

had one on the car for a few hours, it was fine during normal driving, but under WOT the ASP caused random misfires..Pulled the ASP and put the stocker back on and no more problems.

99 Black Bird T/A

iTrader: (4)

I think during road racing events a couple of manual six speed cars had timing chains break that were using ASP pullies, heard this years ago.

We used an ASP pulley on my 383 LS1 and it's been fine. The rotating assembly was very carefully balanced to help keep harmonics down as much as possible and a double roller timing set was used.

dr_whigham

iTrader: (49)

You couldn't GIVE me an ASP to run. However, I had great success with the PowerBond 25% and loved it. But yeah, never heard of them throwing TIMING chains.

The early models had short shoulders and would throw belts, but they supposedly rectified that years ago.

joecar

Note that crank hamonics are due to the crank twisting/untwisting (and resonating like this) with each cylinder ignition event, and is/are regardless of how finely balanced the rotating assembly is.