The principle behind the higher pressure is very simple and has very

little

to do with sonic waves or resonance.  It is simple inertia.  Air rushes

down

the intake tract at high velocity (there's that dreaded term again) and

as

Newton said, a mass in motion tends to stay in motion until acted upon by
another force.  The "other force" in this case is the rise in pressure
(above ambient) in the chamber.

Thanks, Tracy.  I've just had too many e-mails lately to get around to
making a response to this one.  Treating the air as incompressable (good
assumption for the intake flow), the mass is fixed by chamber volume, and
momentum is mass times velocity.

Talk to Paul Yaw for further info.  He has done lots of flow bench work, and
performance enhancement, and recommeds high high velocity in the runners.
How high is high I don't know.  Obivously at some point the wall friction
losses take there toll.

Al Gietzen

Paul Yaw is wrong for reasons I have already outlined. Paul Yaw has been
proven wrong by what Mazda did with the Lemans engine. When Paul Yaw
gets 240 HP out of a NA 13B two rotor at 6000 RPM using smaller diameter
runners than Mazda used  on the Leman engine I will eat my words.

Paul Lamar

 
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