[Vwdiesel] Piston fit in block ---- ( when reboring ).

James Hansen jhsg at sasktel.net
Tue Sep 28 02:36:38 EDT 2004

>And it is very difficult to get a gasser machineshop to fit pistons that

Yes it certainly is.  Close tolerance honing seems a thing of the past at
your average machine shop.  Now for good work it is almost a necessity to go
to a specialty shop that deals in engines exclusively, and even then...

>I am going to ask James Hansen what he fits racing engine pistons to
? ---my
>guess would be 10 thou. (or more ?)

Depends on the pistons.  Forged get fit tighter (.003), cast looser(.006). I
know some guys go even looser than that, but with short skirt pistons these
days, you pretty much need some semblance of fit. I could see ten thou being
good with cast long skirt pistons and a good single compression ring like a
total seal.

That's for stock car motors, don't try this at home....

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