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 investigated that.

Paul Lamar

Paul, I believe that Jerry's vertical pivots should be at least neutral to the flow. You would have to test for the best position for the horizontal pivot.
Bill Jepson

 
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