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any way to calculate approx comp ratio?
is there any way to calculate approx comp ratio using cyl press. heads are 72-74 cc, not sure about pistons.
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if you mean cylinder pressure as in cranking the engine over with a compression tester in the spark plug hole,then the answer is no.........
Your cam overlap or lack there of will make a huge difference in the actual cylinder pressure and not have anything to do with the compression ratio..... example, I checked the compression on 2 different freshly rebuilt 351-W's. engine #1 barely showed 125 pounds when cranking, but had a cam in it that had a split duration and a lot of overlap,this one calculated out to 10.4 to 1 compression........ engine #2: pretty much a standard rebuild, stock 351-W cam has approx. .375 lift, this engine had a cam of only .415 lift, no overlap and was not a split duration camshaft....cranking pressure was 150+ psi and the calculated compression ratio was only 9.7 to 1......... |
If you have the cc's of the heads, dish of the piston, bore and stroke you can get pretty close numerically.
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