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Piston slap when warm? 700 1991

posted by  pablos on  Mon Dec 23 01:26 CST 2002
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last visit: Tue May 22 00:43 CST 2001
[RELATED]

First let me calm your fears about Amsoil "causing abnormal damage to my engine".....It's not. How many 100's of 1000's miles have I run, Dick from Falls Church, and lots of other Volvos (and more other makes) - My 240 turbo alone has 234,000 miles - zero piston slap!

Sure Mobil 1 has Mo in it but: a) the wear rates and wear metal levels in Mobil 1 are not lower and b) Mo in oil as only an extreme "just in case" antiwear agent - it has nothing to do with Volvo piston slap. Amsoil uses ZDDP as it's extreme antiwear agent. Both somewhat coat surfaces - but neither do much for piston skirt slap.

Now let's get to your problem. Here's a clue:

"It did make just about the same noises when it was being broken in on dino Penzoil 10W30. I expected them to go away when I switched to synthetic."

I have heard synthetic oil quiet lifters and such because it pumps up sooner. I rarely hear that synthetic oil quiets piston slap as the others have mentioned. I am sure that some oils may seem quieter. Try a range. Don't forget Amsoil 15W-40 (in my experience a "quiet" oil).

Now, please post some specs. ALL new parts (except crank and rods). Did he bore and use oversize pistons? What sizes? How was the wrist pin fit? Did he use the long skirt pistons? What brand?

Have you listened with a mechanic's stethascope?



--
http://www.fidalgo.net/~brook4/oilslubesfilters.html






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