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

   Simple but effective. Do you cut a uniform slot top to bottom or leave a radius in there?
    Seems like a good idea. Did I miss the part about you making your own extended side
   seals? To take advantage of this I would think you need a side seal that is longer than
   you can normally get from Mazda.
   Bill Jepson

   Silicon Nitride side seals, if and when they become available, will cut the wear
   on the cast iron side plates.


   Paul Lamar


Blow by is an issue in especially supercharged engines. I read a bulletin regarding this in respect to diesel engines and turbocharging. Higher cylinder pressures tend to allow more gasses to find a way past any seals. Anything that reduces clearances on seals helps.

Dale Davies



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