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

Powersport did it right - the butterfly is horizontal.  Paul, this
msg
is from my computer at work - is the spacing fouled up?  All of
these
messages print correctly when I 'copy' myself.    Ken Powell

The spacing is good. The Power sport shaft is vertical.

Paul Lamar

We will  have to wait to see if my engine idles nice.   But if someone
wanted to run the shaft the other way, all  they have to do is rotate
the throttle body in the housing.    Sure would complicate the
linkage.
  Jerry

  I am not worried about the idle at all. I have witnessed  p ported car
engines, set up to rev 10,000 rpm,   with huge ports, big overlap,
carbs (butterflies)  on 12 inch intakes, idle smoothly enough for our
purposes.  I expect to have a smooth idle with my very tame p ports.

  We are all different but if my engine sounds as if it has a radical
cam in it on the ramp,  I won't mind.  When I climb out at 3000 fpm
nobody will remember that it loped at idle.      Jerry

 
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