Paul Lamar wrote:

There is another problem with the up and over manifold that
I have been ignoring so far. There is some minimum length around
23 inches due to the 3" center line 180 bend (8.352" long by itself)
and the clearance needed for the plenum. For a 2.85:1 7500 RPM
gear box that is too long.

Standing-wave pressurization (a.k.a. "tuned intake") is a nice dream,
but I think that it should be rather far down on the list of objectives.
And even then I suspect it would be better to tune for cruise rather
than max HP.

Another advantage of the Russell manifold so far not discussed is
you don't have to modify the oil filler, breather or the dip stick.

Gravy. Put one of your trim water pumps on it and the whole engine can
be moved up rather far on the firewall, giving a high thrust line and
more prop clearance.

BTW if Russell wants to disown it we could call it the "Plenum

Forward" :)

"Disown" is such a pejorative term.  It's not like I am ashamed of the
idea, but that it was simply a "what about" kind of comment.  You
brought it to life.  So I'm the father and you're the mother: my
contribution was miniscule, and only needed at the conception; you're
contribution was all about sweating and huffing and ...

Russell Kent

 
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