Here is a real used
engine that I used in
the car for a while.  
After it ran out of spec.,
I decided to make use
of it instead of trash or
try to re-build it.  
Basically if your not
familiar with it, the red
portions are the rotors,
silver portions with
"Mazda" logo are the
housings, and the black
parts are the side
housings or "irons".
This picture is
basically the rear
rotor  inside of its
housing from rear
view.  The leading
spark plug is on the
bottom and trailing is
on top. The exhaust
port is on the right
(though not visible).
The rotor spins on a
shaft 180 degrees
opposite the front
rotor.
 
 
THE ROTARY ENGINE