Ben,
Just a week or so back, someone posted to the mgs list the website for
a company that makes headgaskets. I read most of their information. One
of the FAQs was this question you raised. They say that their gaskets
made for just this need work fine for the purpose. It would seem that
even 150 psi pushing against .085 gasket thickness would not have much
area to push against to move the gasket.
I'm copying your query to the mgs list in hopes that someone will still
have the website address of that company.
Bob
TD MkII
On Fri, 23 Jun 2000 08:33:58 -0700 "lbprince" <lbprince@email.msn.com>
writes:
> The XPEG head on my TF 1500 has been shaved too many times. With
> the
> static timing set at TDC, it is on the edge of pinging even when
> premium
> fuel is used. By interpolating the stage tuning data, the
> compression ratio
> is around 9.6. Readings on a compression gauge are between 175 and
> 180 psi
> on all cylinders. The engine was recently overhauled. Octane
> boosters seem
> to help, but they are expensive and a hassle to fiddle with.
>
> To reduce the compression ratio to 9.3, my calculations indicate
> that a
> .085" gasket " (compressed) should be used. The Gasket Works in
> California
> makes copper gaskets that are this desired thickness. I am told,
> however,
> that copper gaskets tend to leak unless special precautions are
> taken. Is
> this true? What are the special precautions?
>
> There are other options like shaved pistons and increasing
> combustion
> chamber volume. Are these other choices advisable?
>
> Thanks,
>
> Ben Prince
>
>
>
>
>
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