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

The problem with the Pratt system for the side seals is that they will fall into the side ports.
This wouldn't be a problem on a peripheral port if no side ports were ever cut into the housing.

In the attached photo notice two important things: the trailing side seal scissors it's way back onto the sideplate, and the leading end of it's companion seal never opens to the port.  This is how to increase porting for more flow while keeping stock longevity in mind.
While this is a "Street Port" template notice from the photo what would happen to the Pratt side seals... they would fall into the port!

The next two pictures show what a normal rotor looks like with 50k miles and mine at 30k.
By the way I picked this idea up from Mazda or NSU in one of their early drawings... the reason they didn't use is probably because of added labor costs.
Barry Bordes

Barry, what computer or cell phone are you using to process your email?
It sure make hash of the forwarded emails. Try turning off word wrap.
Maybe the word wrap line length is too short.

Creates a lot of work for me.

BTW a slot on both sides of the corner seal will help the compression of the
air.

If it were up to me there would be no ports in the end housings :-)

Paul Lamar


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