Crank case pressure is a result of end gap size in
 the side seal to
   corner seal fit, the corner seal to apex seal fit and
 the    corner
   seal to corner seal bore fit.

   I start side seal end clearance at zero. Replace at
 .0025" Use the
   old    solid corner seals, not the ones
 with the rubber plug. Use
   the largest breather hose diameter  possible.

   Lynn E. Hanover


   I agree with Lynn Hanover on controlling
 Blow-By....  but I cut the
   corner \seals for zero clearance a shown in the
 attachment to avoid
   locking interference with the side seals.

   Barry Bordes

   Not a problem for a dry sump system. A little blow by
 helps.

   I highly recommend it for any aircraft application as
 one can use a    better oil pump and up the oil pressure. Particularly
 with an    aluminum front housing where the stock oil pump is
 problematic.

   Paul Lamar


   Hey Barry B.

   Could you show us the jig set-up you use to cut the
 corner seals    like that? Thx!

   Dan Gorsline.

   My Photobucket file blocks any attempts to
 download... so here is a    diagram. Made with 1" angle iron. A corner of a
 rotor,  and a Dremel    diamond disc.

Barry Bordes


   Brilliant idea Barry. I consider this an important
 improvement in the  rotary sealing. Solves two problems. Hand fitting the
 side seals  during overhaul and improving the side seal sealing.
 This results in  a small improvement in BSFC and power. In some cases
 when the hand  fitting is poorly done a larger improvement :-)
 Felix  Wankel would   like it.

   You should sell these.

   You need a web site Barry.

   Paul Lamar


 Hey Barry B.

 Thx for the drawing. I'm not fully clear at whats
 happening..are  you using one of the other corner seal holes as a pivot
 point  for the jig? You need a website and YouTube vids. You
 clearly   know some good rotary tricks. Please try again to
 send pics  (or better yet, video!) of jig in action.

 Thx again!

 Dan Gorsline.


 Barry is using an old rotor to hold the corner seal
 while he slots it with a dremal tool. This allows a little
 lee way  in the length of the side seal and does a better job of
 sealing  the corner seal end.

 Here is a quick 3D for Barry.

 Paul Lamar

Nice drawing Paul,
But I cut the corner of the rotor off and attach it to two pieces of angle.
The drawing should show the die grinder flipped and the diamond disk moving in a 7.344" arc.
I first installed the mod in April of 08 and have over 30k miles on it.

Since this sectioning destroyed the rotor I then made it into a special tool
(per Lynn Hanover's idea) for scribing side seal paths on the side plates.
This too is a critical area for long side seal life.

Barry Bordes

It is rather surprising that Frank found a Pratt & Whitney Canada  patent that already does this.

We will see a Pratt&Whitney Canada Wankel any day now. They can use the gear box off
the PT6 only slightly modified.

Paul Lamar

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