Jerry Hey wrote:

 > >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
 > >

 Jerry,

   Is it your plan to eventually offer these inserts for sale? Or rotor
 housings with the inserts installed? Or??? What do you see as a time frame
 for this happening and what sort of cost? I'll initially fly the 4 port
 that Bruce T built for me but I intend on building my mock up engine into a
 PP for install at a later date.

 > Mike Wills

Mike,  I hope to be able to install the inserts in your rotor
housings.  I won't have an idea about the cost until the prototype is
built.  Time frame is within 90 days.    Jerry

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