I currently go to school for automotive tech, and we learned about doing compression testing. We were taught that if you take the PSI minus 5, then minus 14.7, then divide by 14.7, you come up to your compression ratio, to one. And the same goes for the opposite if you have your compression ratio you can find what your PSI should be. Well... I did my PSI on my JDM B16A and came out with 210 PSI for each cylinder. If my math is correct, that means my CR is 12.9:1. I thought a JDM B16 CR was 10.4:1 and that would be about 175.5 PSI. Was I tought wrong? Help me out if you know... Thanks.