...a few more variables, like temperature for one. 10 psi @ 200F and 10 psi @ 120F make for very different combustion events. The effective compression ratio would be the same, but the total molecular mass would not and finally the force pushing the piston down would be very different as well. We see this often with dyno charts - compare 19 psi on stock turbos vs. a sport 700. The key word there is "efficiency" which translates as ratio of total molecular mass / output temperature.
Is molecular mass a better expression of a combustion event than "effective compression ratio?" Does anybody have a Grand Unified Engine Combustion Event type equation?
