Quote:
Originally Posted by drmiller100
it is an adiabatic process.
this means it takes the same energy to add 5 psi or remove 5 psi.
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EDIT: my bad, it's adiabatic since there's no heat transfer, but adiabatic does not mean same energy to add 5 psi or remove 5 psi.
E4ODnut, I think under full load conditions, ~1.1 fuel equivalence (16:1 AFR or so) gives highest thermal efficiency, ~0.9 (13:1) gives greatest power, but under partial load you can go much much higher with AFR since you don't need the power, and drawing in extra air is not as bad for efficiency as restricting the airflow.