Paul, intake manifold don't have to be long to be effective. NA race engines
normally have short manifolds. If you want to spend a lot of time and money
developing a (dyno) tuned long manifold, that's fine, but a short straight
manifold is going to be less than 5% difference. I think the dyno would confirm
this.

The racers run their engines at 9500 RPM.
Mazda did a lot of dyno work and they found 30% at 6000 RPM in the case of the 20B.
Dave Atkins did not have a dyno the last time I looked in his shop.

BTW Chuck are you interested in selling your 20B's or your airplane
with the 20B's?

Paul Lamar
 
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