Quote:
Originally Posted by nbleak21
Under general principle, yes... but the design of the intake tract can greatly effect where the pumping losses have their greatest effect. In fact, the observation that sparked this thread in the first place was that I seem to have less pumping losses at 3100rpm then 2800 with my current engine, as the TPS requires less opening to maintain a higher speed then it does lower.
This leads me to believe that the sweet spot may of the IM may be at approx 120cfm, so the 150cc increase in displacement would drop that RPM for the same volume from 3100 to 2900rpms
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The only thing that could explain that would be harmonics, not pumping losses. Other could be transmission oddities.