On Mon, 28 Jun 1999, Mark Endicott wrote:
> company that makes gaskets to order out of pure copper. Is there a
> formula I can use to determine how much thicker gasket the gasket should
> be to add the additional chamber volume to change it from a stock 1275H
> (8.8:1?) to about 8:1?. And/or anybody know what the thickness of the
> stock gasket is?
Mark,
first you have to determine the combustion chamber volume (v).
The formula for compression ratio (CR) is
CR = (V+v)/v
where V = displacement of one cylinder (1275/4)
Solve this equation for v to get the combustion chamber volume.
To calculate the CR with a thicker gasket, use the same formula, but use a
new v, which is the original v plus the added volume by the thicker
gasket v*. This added volume v* = pi * r^2 * t,
where r = radius of cylinder (bore/2)
t = amount by which the new gasket is thicker
So the new CR is
CRnew = (V+v+v*)/(v+v*)
(You could now say CRnew = 8.0, solve for v* and then solve for t to get
the required thickness increase of the gasket)
Ulix __/__,__ ___/__|__
..............................................(_o____o_)....<_O_____O_/...
http://students.washington.edu/~ulix/ '67 Sprite '74 X1/9
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