Jerry Hey wrote:
Thanks to an e-mail exchange with Rolf, I now understand p port
timing and can characterize it in plain simple language. The
Leman's P Port and the Paul Yaw P Port both close within a degree of
each other: around 75 degree BTDC. This is about the limit for
closing the port. If the port is positioned to close at 75 degrees,
the Intake Opening event then is determined by the SIZE of the port.
Since the Leman port is two inches i.d. it opens very early. A
smaller port will open later. It is so simple. A smaller port
centered the same as the Leman port would open later and close
sooner. I still don't know what the optimum port size is for the
6000/7500 rpm range but I think it probably can be somewhat smaller
than a port that can operate at 10,000 rpm and 300 hp. I'm slow
but I do get there,
--
Jerry Hey
Tailwind & Rotary Engine Support
http://www.j-winddesigns.com
mailto:j-winddesigns@thegrid.net
The optimum port size for 6000 RPM is exactly the same
as the Lemans engine! The timing is also exactly the same
as the Lemans engine. Mazda would have no reason to lie about
that drawing. It would be stupid of them to lie. GM or Ford
or somebody else could copy the engine exactly and call them
on it. If you look closely at all the pictures I sent you will
see that the port position in the drawing correlates with
the pictures of the four rotor and the Mazda P-port housing
picture. The one on the left in this picture.
The HP you will get if you copy the Lemans
port size and position exactly is 240 HP at 6000 RPM.
Much much more at 7500 RPM. When you get the engine
built you can check it on our dyno.
Nobody else. Not Jim Mederer, Not even Paul Yaw has
built an engine with a different port size or different timing
that has equaled the HP at 6000 RPM of the Lemans engine!
Here are the pictures and the drawing yet again.
Paul Lamar
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