The problem with a stock type copper gasket is when you have milled the head
enough, the gasket is actually into the combustion chamber slightly right
next to the inlet valve. The protrusion vibrates, the ring on the gasket
splits, then the sharp edges give you an instant pre-ignition source and soon,
at racing revs, a neat hole right in the center of the piston.
Never Be beaten by Equipment
Kas Kastner
----- Original Message -----
From: Larry Young
To: Jack W. Drews
Cc: Bill DeWar ; fot@autox.team.net
Sent: Thursday, June 08, 2006 5:45 AM
Subject: Re: [FOT] 4Cyl Tractor engine liner height
In my opinion, the compression ratio argument doesn't hold up. Most of
us racing with 87mm forged pistons must custom order pistons. It's easy
enough to specify 0.025 more compression height in order to make up for
the difference in gasket thickness.
Jack W. Drews wrote:
>One man's opinion:
>
>Some owners really want to use the steel shim gasket just to get the
>increase in compression ratio. But, consider the fact that the stock
>sandwich gasket compresses to maybe .050, the steel shim gasket
>compresses to maybe .025, so you can get the same compression ratio
>increase by just milling the head another .025.
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