I think I recall reading somewhere that a natually aspirated fixed cam Miller cycle engine had a very narrow power band. Maybe thats why the cam phasers are used on the Prius and others, to widen the useable rpm to a more useful span.
I think it would be a good idea to look at an existing sample engine to verify this.
Maybe engines with cam phasers should be added to the requirements. What motorcycles have variable valve trains? All I can think of are the Kawasaki Concours 14, and (I think) the Honda VFR 800. Both have EFI. Any others?
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