Ken Powell wrote:

Hi Paul,
I was reviewing your drawings for the PP and noticed that we are opening
the flapper valve from from bottom-to-top - this seems to be the wrong
direction.  It would appear that it would be more efficient to open the
valve from top-to-bottom rather than from bottom-to-top.  The idea is that
the port timing should be very conservative when at idle and at small
throttle settings, so there should be only a small (or none) overlap at
idle and small throotle opennings.
What do you think?

Ken Powell

Sounds right. Did not think about it. 
I'll give it a bit more thought in the next few days.
I am not making another set :-) Too much work! :-)

Paul Lamar
 
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