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12-22-2004 | 04:29 PM

#14

knarF

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From: None, NETHERLANDS

RE: Calculating compression ratio

I have the strong suspicion that indeed compressions ratio is calculated from the point of all ports closed.
My self converted OS10FP (with 2 piece contra

) and .46 OS run fine at approx 1:19 / 1:20 CR. (calculated from all ports closed, it must be the fuel i guess ) If I would calculate the CR from pure bore*stroke for both engine i would end up with a CR of approx 1:14/ 1:15.

My mix is 54/33/15/2 or so (I have hard time remembering numbers lately

)

Best regards,

Knarf.

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