Didn't the whole High comp thing start in rallying where as Mark says point and squirt is the name of the game and these guys don't rev their engines very high or for prolonged periods. I mean with a restrictor engine, I guess you can't rev it as there isn't enough air, so you may as well maximise the CR to accomodate the RPM range that you have.

Surely this is about maximum cylinder pressures, surely the cylinder pressures of both engines are the same. A High comp motor runs less boost at the top end as it has the extra compression anyway, and a low comp motor can rev harder before it reaches that maximum cylinder pressure.

I would also like to see the ignition maps for both engines and I reckon the low comp motor is gonna have more advance and more power at the top end. If that is the case, why go high comp if you aren't doing anything with it because you have to retard the ignition so much so that it doesn't det and you can keep everything cool enough.????????????

Stu???? Karl????

Sean..