> snipped

  >>
  >> Paul,   I have a problem, maybe a birth defect, that manifests
itself as an
  >> inability to see gross errors in drawings until after I have posted them
  >> for everyone else to see.  I sorry guys.  Here is the corrected drawing.
  >> Jerry
  >
  >
  >> Tailwind & Rotary Engine Support
  >>
  >> http://www.j-winddesigns.com
  >>
  >> mailto:j-winddesigns@thegrid.net
  >
  >
  > Paul Lamar

 Isn't there some old hot rodders' rule about keeping the worst constriction
 (smallest area) of an intake runner the farthest from the entry to the
 combustion chamber? I assume for the same reason that you do the pressure
 recovery trick into a heat exchanger.

 > Charlie England

Hi Charlie,  It is all about timing.  To get the IO that I wanted the
largest hole that could be bored (centered in the lathe) was 1.5
inches.  The bottom of  the bored hole is exactly at the intake
opening position.  A bigger bore would open sooner, obviously.   The
bore could be made the same through the runner and insert by
decreasing the runner bore to 1.5 inches.  I think it would be more
than adequate for  the rpm's but I would like to use Paul's injector
holder casting which has a 2 inch o.d.  As is,  I like the little
venturi created by the chamfer and the blending to the the 1.75 bore.
We will not know until the dyno.    This is the first drawing and I'm
not locked in.    I  think that the bore, even if only 1.5 inches
throughout would be adequate for the rpm's (7500 max) .  Jerry

P.S.  I started with the Leman port location and worked from the
center of that to the I.O. and I.C. that I wanted.

Jerry Hey

Tailwind & Rotary Engine Support

http://www.j-winddesigns.com

mailto:j-winddesigns@thegrid.net

Jerry you might want to machine a ridge on the end of
the pipe so a hose cannot slip off once the hose clamp
is tighten down. My castings don't have it due to minimum
wall thickness problems so a small groove should be 
ground in with a die grinder.

Paul Lamar
 
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