View single post by Judson Manning
 Posted: 12-10-2005 07:07 pm
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Judson Manning



Joined: 03-14-2005
Location: Atlanta, Georgia USA
Posts: 406
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 Since I had nothing better to do today, I decided to compare my calculations to emperical data.  This is what I found:

Combustion Chamber Volume (Head):  37cc (decked 0.020")

Stock Piston Dish:  17cc

Piston Deck Height (.025"):  5cc 

The margin of error is significant in the above numbers due to the surface tension & miniscus(sp?) of the working fluid.  I used both water and WD40 and the above numbers represent an average.

We can massage the numbers to fit within the expected calculations to help minimize this error.

Expected CCV (based on 8.4:1 c/r) = 66.7cc

Calculated Piston Deck Height (0.025") = 4.5cc

Calculated OEM gasket thickness (0.030") = 5.4cc

66.7 - 4.5 - 5.4 = 56.8cc Expected vs. 37cc + 17cc = 54 measured

With reasonable certainty, we can expect a stock head:

CCV = 40cc, and the Piston Dish = 18cc

I envite everyone to examine my reasoning and to offer their measurements, observations and calculations for analysis.