Jerry Hey wrote:

Paul and all,   I have been thinking about the pport shape, size,
timing   and the insert all day instead of working on the rad
installation like I planned.  With considerable help from Rolf
Pfeiffer who supplied plenty of experience, good advice and math
ability I have come up with the port size and shape as shown in the
drawing.  Paul,  you will not like it because it does not copy the
Leman timing but you will like the fact that  the insert is large
enough that the Leman port can still be done at a later date.
Notice that all four sides of the PPort have slight curvature.  This
is Rolf's advice and is done to protect the seals. The radius' were
added after the opening and closing calculations were completed so
the IC is a little off.   IO timing was not affected  but the IC was
retarded because I  had a little room to play with.

   The insert is my pride and joy although no drawing of it exists
yet. It will be made from a solid piece of 2.5 aluminum rod.  This
piece can be bored to any i.d. from the largest to the smallest of P
Ports.  Further, final  shaping of the port can be done to the insert
at the bench.  On the outside of the housing the insert will be bored
and turned to exactly match the runner.

  I would appreciate any advice about sealing the butterfly shaft.
Would tightly fit plain brass bearings do the job?       Jerry

--
Jerry Hey

Tailwind & Rotary Engine Support

http://www.j-windde

No skin off my teeth :-) With EFI you don't need to seal the
butterfly shaft. A bit of air leakage is of no consequence 
because the mixture is adjusted with the O2 sensor.
Also the percentage of the air leaking in around the shaft
is a tiny amount compared to the main flow. Aircraft engines
run WOT most of the time.

Paul Lamar
 
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