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

Barry, Paul and all,

   A top view would sure help me to fully visualize Just how you
constructed your jig just how much of the rotor tip to cut off..........

Thanks,
Kelly troyer


The rotor corner is held on by three screws.
Use an apex seal to key the corner seal while grinding.
If you look closely at the paper in the box behind the tool there are "notes to self".
The grinder is raised and lowered depending on which direction is being ground.

Barry Bordes



Much better picture Barry. Thanks.

The notes where not clear. Do you have a scanner?

Paul Lamar



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