ORIGINAL: downunder
ORIGINAL: 1QwkSport2.5r
I used the formula head vol. + swept vol. / head vol.
If that's the formula you used then it's geometric compression (which is what I use) so your figures would be what I'd expect.
Yes, but i measured the effective stroke having the ports closed. Perhaps I used the wrong term. I determined both geometric and effective ratios but I only care about effective compression since that's the ratio the air/fuel mixture is being compressed.