Bob wrote:

Have just scraped version 4 of the intake
manifold, and have no radiator decision yet.  Any suggestions on
the intake would be appreciated.

It aint quick!

Al Gietzen wrote:

I'm still pursuing a compact, short manifold and a 3-barrel throttle body.
According to David Atkins; dyno tests done by Mazda engineers years back
showed his short (4") manifold had only 1 to 2% less power than Mazda's
tuned manifold.  I'm going for the 'packaging' advantage.  When (if) we get
it done, I'll post a picture.

Did I mention that patience is not my strongest attribute?

Al

That data is pure BS. I have lots of that kind of data in various SAE papers
published by Mazda and there is a very good reason that all late Mazda manifolds 
have long runners. I saw your manifold or one that looked like it at Arlington
and I was not impressed. Here is a picture. I think Paul Yaw will agree that
this manifold is not what you need for good power at 6000 RPM.

Paul Lamar
 
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