" From: Matt Haas <mhaas@xxxxxxx> " " So what you are saying is that the cylinder pressure is higher because " you can get more air into the cylinder to compress, correct? I honestly " do understand that and it's why turbo and super chargers make more power " but you still haven't altered the size of the cylinder so the " compression ratio hasn't changed. -mechanical- c/r. that's defined the way it is because it's easy to calc, but as noted true effective c/r is affected by valve timing at least so this number has limited meaning. i wish i had a copy of ricardo around. i'm pretty sure he talks about this in detail. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://splatter.wps.com/cgi-bin/mailman/listinfo/amc-list