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,
Scribbing pathways for side seals?! This is another thing I've never
heard of, more info needed! Thx!
Dan Gorsline.
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