Timing Chain rattle

Mack 6 · 29-03-2012, 08:34 AM

Hi there guys.

I have done a few searches and got a few ideas, but am having a small issue with the timing gear on my AU2 6cyl.

I drive the car reasonably hard and do some racing, but I have had to replace the complete timing gear twice in the last few years due to snapped tensioner.
I only get noise for a second or two on start up (until there's oil pressure) and if the car is revved, as soon as you back off there is a rattle of chain on guide (I'm guessing)
I have spoken to Bruce Heinrich who recommends a better quality chain which won't stretch as much, and while I am considering this, I should add it has a JMM dev 3HL cam in it. I found a thread saying many JMM cammed cars have a similar timing chain issue, does anyone know why?

Whilst I'm sure i'll get a good result with another cam, if i can fix the problem with slipping in a different chain, I'll do that for now.

I am running a synthetic 10w30 oil atm, thinking of something slightly thicker just to help out. Any recommendations there as well would be appreciated.