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Kenik,
Interesting question and I still have a lot to learn.
In general with 'optimized' motors, all other things being equal, VE tends to fall with increases in rpm due to other factors such as friction, windage, a shorter power stroke to capture combustion energy and other variables that work against us. This is just a genneral principle.
However increased frequency of the power strokes with greater rpm can more than offset these factors and increase peak HP.
Thus, if we had two optimized motors. On might make say 200# at 5000rpm and 207hp at 6000rpm. Another might make 190# at 7000 rpm and make 262hp at 8000rpm.
What a good tuner should do is increase the VE in other ways along the desired operating RPM and tune any bump in VE from intake and exhaust reversion or scavaging to happen where he wants it.
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