> Jerry Hey wrote:

 >
 > I think that my wife, Joy,  has determined the peripheral port size
 > and timing  of the Leman Engine.  Here is what we did.   First I
 > measured the inside vertical height of a l3B rotor housing.  This I
 > determined to be 9.44 inches which we divided in two (4.72")since we
 > were only interested in the top half where  the intake port is. Now I
 > step out of the picture and Joy takes over.   The second step was to
 > import the drawing of the Leman engine into PhotoShop where it was
 > cropped to eliminate all but the top half of the rotor housing.  This
 > was saved as an EPS and exported to PageMaker.  Then, in PageMaker
 > she drew a line 4.72" long and scaled the eps image so that the
 > inside top of the rotor housing and the horizontal center line
 > matched up with the ends of the 4.72  line.   At this point the Leman
 > drawing was at one to one.  Then, using Pagemaker  tools,  Joy
 > measured  from the center line to the bottom and top of the P Port.
 > It was 1.2" to the bottom and 3.188 inches to the top.  That is close
 > enough to use a 2"i.d. x 2.25 o.d. aluminum tube for the insert.  The
 > runners appear to be same diameter as the port.
 >
 > Don't know what I'd do without her.    Jerry

 Jerry, I'm be very interested in your progress.  Please let me
know how your doing the PPorting.
 IE,   Mill or die grinder.   Will you have the port set at an
angle like Power Sport does?  Are

 > you going to thread the insert?  Any help here is appreciated.  Tom Webber.

Tom,  The P-Ports will be NC milled.  I don't think it is necessary
to thread the insert although this is what Jim Mederer says.  I know
that others have not threaded and have not had problems.   The angle
of the insert is another question.   I would prefer it to be
perpendicular to the housing. However,  this places the runner at a
weird angle if you intend to go over the top of engine.  Better to
just have a couple of 90 degree bends that can be readily bought.   I
am not locked into anything yet.   The P-Port timing is still a
mystery to me.  I tried to compare Paul Yaw's numbers with the tech
drawing of the Leman ports and they did not coincide.  Maybe I did it
wrong.    I would be  happy to just copy the Power Sport ports, if
only I could.  Jerry
--
Jerry Hey

Tailwind & Rotary Engine Support

http://www.j-winddesigns.com

mailto:j-winddesigns@thegrid.net

Jerry, you got the dimensions on the Leman engine. Why don't
you just copy that? What do you need the timing numbers for?
They are just academic anyway. If the port is in such and such
a location the timing is such and such. The two things are inextricably
linked. I can't figure out what it is you are missing?
There is no cam shaft timing to be set. There are no cam lobes
to clock.
 
Paul Lamar
 
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