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Ed,
Yes, the BMW unit did look big and heavy, but I'm sure we could do much better, if it would be worth the effort. Primarily, I was just interjecting another way of looking at the problem. It seems to me that it might be easier to build with your/our Craftsman equipment than the PTEDDIEIM (precision trombone EDDIE intake manifold).
If, like you said, it may work but it isn't EDDIE, then this is not the direction we would want to go. I'll have to admit that I don't yet understand the EDDIE phenomenon, and will have to wait for Shady Bend to become enlightened.
Mark S.
P.S. Will EDDIE work on a 3-rotor? (Inquiring minds...)
At 04:19 PM 9/24/2003 -0400, you wrote:
Hi Mark,
I saw that a while back on the web. Certainly looked interesting (but
heavy and expensive to make). Also, while I am not absolutely certain about
this. It seems from what I have read, most of these type variable manifolds
are based on the "Organ Pipe" or "Helmholtz Resonator" theories or some
combination/mix. The things they have in common is the resonance effect
from a tube "tuned" to a selected frequency. Said resonance effect
promoting air flow when engine operating RPM is on the "resonance".
The type below change the place the "resonance" effect takes place so that
they can continously vary it to match the operating RPM. They basically do
this by varying the "effective length" of the intake tubes. However, the
EDDIE is not based on any resonant effect. About the only thing I see the
two having in common is the speed of sound.
That is not to say that such a variable intake would not be useful as part
of a basic induction system to promote airflow at different rpms, its just
not the EDDIE. IMHO
Ed Anderson
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