Paul, et al;
I'm getting ready to bore some holes in rotor housings for a P-Port  and
wonder if I can locate the port opening position for the P-Port by  measuring
the relative location of the existing side port opening positions.  I.e. if
the side port opening position is at 80deg BTDC then can I just  measure the
same distance up from the bottom of the rotor housing for the  bottom of the
P-Port opening?

Thanx,
Joe Hull
Cozy Mk-IV N31CZ (65 hrs - Rotary 13B NA)
Redmond (Seattle), Washington


As I recall it is 8.64 inches up to the center of the hole
from the bottom of the rotor housings. I scaled it off this
drawing of the Lemans engine.

I used an angle plate and made the bore perpendicular to
the vertical center line of the rotor housing.

I recently updated the web site on this subject so look it
over and if you need more info or pictures let
me know.

--http://www.rotaryeng.net/intake.html


I started with a 1 inch drill and then used a 1.5 inch shell cutter
with the final cut using a boring bar.

You will need to make a slide throttle as well.
I have not heard from Tom Weber lately so I don't
know if you can still get one from him. They are easy to make
anyway. Let me know if you need a drawing for that.


Paul Lamar ...No rotor no motor.

Also Joe get a junk rotor housing from Hayes or Atkins to
practice on. And pot it with JB Weld before you drill and bore.
Mazdatrix sells it in the large size for about $16. You will
need two sets.

Paul Lamar

Paul, just to jog your memory,it was  Joy (my wife) and I that
determined the Mazda p port port size and timing by scanning the
drawings published by Mazda into Photo Shop and from there into Page
Maker where we used precise lay out tools to get the measurements
which we then published on ACRE.   Regards,  Jerry


Sorry! I think you are right. I double checked however
using my hangar neighbors Anvil and his big plotter:)

Paul Lamar ...No rotor no motor.

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2006 All world wide rights reserved.