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Re: Is that after you turn off car or while its on (archive)

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Posted by Don Stevens on September 17, 2000 at 19:17:44:

In Reply to: Is that after you turn off car or while its on?? posted by Tim on September 17, 2000 at 11:25:43:

The sound is the combination of a slightly increased clearance between the cam and the follower (are there lifters in an M3? I don't think so but I am an e-30 guy so your valve actuation may be hydraulic) and the the fact that the oil has thinned out because of the heat. The reason it goes away after the engine cools a bit is that the clearances get tighter and the oil thickens back up. This is one of THE big advantages of synthetic oil. It thins out much less and protects much better under the exterme pressure of an autocross run or a track session.

Thanks for the info. Thats exactly what I did- I let the car idle for a while and drove it in 2nd @ 2500 rpm for a little while. The noise did eventually go away. But very scary hearing your baby ticking after a hard run. I just wanted to pass some info in case it happens to anyone else.

At a BMW CCA car control clinic an instructor's Dinan M3 was ticking. He, and other instructors said it was oil starvation and the lifters were making noise. He was on the skidpad for a while so they think that's what did it. All they did to rememdy this was to park the car and let it sit at idle for 10 minutes or so, don't think it's anything to worry about. But I could be wrong (don't think I am, but I'm saying that just in case I am)

Ben H

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