[Vwdiesel] Head gasket thickness & compression levels

[Erik Lane]

Well, I've never measured pin to top of piston height, but in
measuring the diameter of a set of brand new, German pistons from
Halsey import, one of the four was off from the other three by a
couple thousandths. I was surprised, but since we hadn't bored the
block yet we just gave the pistons to the machinists and they bored
one hole slightly off from the others and then marked which piston
went in which hole. It worked great, but if a set of pistons is off a
little that way, I don't see any reason why they couldn't also be off
in the pin to top measurement...

Erik

On Fri, Jun 12, 2009 at 12:53 PM, <LBaird119 at aol.com> wrote:
> In a message dated 6/12/2009 7:53:15 AM Pacific Daylight Time,
> tgott at hotmail.com writes:
>
>> I think the gasket was there to fix the flaws in casing/machining.
>>
>
>  I never quite understood that.  EVERYTHING else about these
> engines is very accurately machined, .001" difference in the dia
> of the piston and the bore!!  It doesn't make sense that the blocks
> wouldn't maintain the crank line to deck distance or stroke length
> but for some reason...
>  I'm surprised there's enough difference in the piston to deck
> height to need milled.  I'd though of checking such but all the
> pistons I've bought for some time now have a coating I'd rather
> not remove.  If they're that bad then a good indexed grinding of
> the crank would be in order.  It'd be a bit shocking if the pin to
> piston top height is actually different from piston to piston.
>    Loren
>
>
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