Quote:
Originally Posted by Jesse Knapp
I am familiar with reversion and the loss of power it causes. So, too much duration can allow unburned fuel into the exhaust and exhaust gases into and contaminating the fresh fuel charge, or reversion. Since all heads flow differently and velocity is determined by piston seal I believe, two identical engines can or would require different cam duration since stroke, rod length, valves and pistons are identical. I thought reversion was caused not as much by length of time a valve is open, but by when it opens and closes. My apology for drifting from the original thread title. It's gotten interesting for me.
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Do not worry about the drifting from the subject...it is all related. Yes, you got it...that is the reason why I shy away from using the same grind for the same application, unless my analysis shows that I am close enough to run the same grind.