Volumetric Efficiency

IQ52 said

It is entirely dependent upon the engine build. I'm sitting here looking at some dyno sheets for a 451 stroker using ported 906 heads and sporting a whopping 9.7:1 compression. It is making 690.4 HP and has 88.2% VE @ 3,300 rpm, oh, and 114.5% VE @ 6,600 rpm.

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Something you might find interesting with VE. I found an old book at the big swap meet we have here every year. It's named something like "Timing valve events for maximum power" or "Valve events and timing for maximum power" or something. By the Isky brothers. Ed did it's of it if I recall. One of the first lines in the book says something along the lines of:

"You will never be able to achieve over 100% volumetric efficiency with a natural aspirated engine. No engine can pump more air than its cylinders can hold."

Something like that. I read that and had a good chuckle to myself. Book was printed in the early 60's. How much times have changed. Just goes to show you.