Fred Osborn wrote:

Paul,

Regarding Jerry's throttle bodies in the attached photo. They are
installed with a vertical rotation axis. It seems to me that the intake
air flow direction at idle would be strongly influenced by the position
of the throttle plate. If the axis was horizontal the flow could be
directed up or down into the opening combustion chamber to effect the
flow of the exhaust gas during the overlap time. Do we know what
direction the axis and the rotation has been in p-ports that have had a
better idle?

Fred Osborn

Its too late now but yes you are right. To answer your question I don't

think

anybody investigate that.

Paul Lamar

 Fred,
I understand what you are saying and that might have some bearing on flow
characteristics, but  with my limited knowledge, the port lip shape has more
of a bearing on flow and Jerry seems to have that under control.
If the port has a squarish shape facing the exhaust and a much rounder
(airfoil) shape leading to the chamber the negative pressure on that edge
will help drag the mixture in the right direction.
>From Jerry's drawings he has these characteristics in his design.
George (down under)

 
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