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



Nice drawings. I was told that old seals from Mazda, having a rubber part inside that obtained a noticeable improvement in tightness, had the problem of the rubber part sometimes going on its own, and entering the working engine elsewhere, I wonder if this could be solved by something as a small metal flap acting as banister for the rubber part staying in place. Comments?

Thanks, regards, Salut �

Jose Gros-Aymerich

Madrid, Spain



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