[Dinsdale]

Do you know if the current generation of F1 engines is 'short opening' the intake valve to produce results similar to what you are discussing (e.g. limiting the time open during the intake cycle, resulting in vacume at the bottom of the intake cycle but allowing a longer effective power stroke vs intake). I realize F1 engines are a special breed (19K redlines on 1.5 liter 800 HP V10 unblown motors), but fuel efficency is still a huge issue for them. They also don't publish any information, but they are all using computer controlled values so something has to have gotten out.

[John Jamieson]

Yes, the "Miller cycle"