I am about to begin drilling P ports. Based on the dimensions given on
  your
  main site, it appears the ports have an angle of approx. 5.5*, sloping
  down
  into the housing. Is that how it is being done? It appears from some of
  the
  photos, that the holes are perpendicular to the vertical machined surface
  of that side of the housing.

  Most of the photos of aftermarket p ports show them at a considerably
  steeper angle, and that after having had the ports threaded into the
  housing.

  Is there any reason I should not use the 5.5 degree shown on the drawing?

  Ed Carver

  We are not bothering with that. We are getting plenty of power going
  straight
  in. So far 250 HP is destroying stock flex plates left and right :)

  IMHO straight in is best  as the air must turn up as the rotor moves away
  from the port.
  IMHO angeling it down is not the way to go.

  However the racers have to get the last HP so it may or may not work for
  them.

  Dave Leonard bought this really expensive and heavy flywheel to run Reno
  and then spent more bucks to have it machined to fit Tracy's damper.
  As I recall it was seven pounds without Tracy's damper. We don't need
  the clutch surface area.

  Went 229 MPH in qualifying so he must have had at least 250 HP.

  Paul Lamar

  Paul,

  I bored my p-ports straight in.  That eased the design & fabrication of
 the
  intake, helping to keep things neat and compact.

  Mark S.



  Alright, straight is it. Now, do I follow the 8.55" dimension shown for
 the center intersection point on the liner?, or use the higher dimension of
 8.7"? Or again, the 8.6" dimension?

 Ed Carver

 I think we used 8.64 :) Your splitting hairs here :)

 Anywhere in that range is fine.

 Paul Lamar



It appears from photos of various p port installations that any coolant
that may have originally passed through that area is nearly completely
blocked. Aside from a little leakage around the tube, how much coolant is
needed to move around there if any?

Ed Carver


None. That is the cold side of the engine. The reason there are coolant passages
is an attempt to heat that side of the engine so the banana effect is reduced.

"Figs. 3.39 and 3.40 show the cooling water passages within the housing of
the circumferential and axial flow water cooling systems for the housing,
respectively.

In the circumferential flow type, the cooling water runs independently of
each housing, being capable of reducing the temperature difference between
the housings and suitable for multi-rotor engines such as 4-rotors, etc.
However, manufacture of the rotor housing is made difficult due to its
closed passage of cooling water.  Therefore, in general, the axial type is
used for automobile engines.

The vicinity of the spark plug hole exposed to heavy heat load js provided
with ribs and fins effectively arranged for increasing its radiating area.
Higher flow speed of the cooling water also raises cooling efficiency. The
low temperature area in the vicinity of the intake port is rather heated by
the cooling water, instead.

Thus, the wall temperature can be averaged over the housing and, at the same
time, the mixture is preheated to increase vaporization and atomization.

To raise such effects, high temperature exhaust gas may be further led to
the low temperature area of the housing."

I highly recommend downloading the Ken Yamamoto book Rotary engine from
this site.

http://foxed.ca/index.php?page=rx7manual

Paul Lamar.

reducing the temperature difference between the housings and suitable for multi-rotor engines such as 4-rotors, etc. However, manufacture of the rotor housjng is made difficult due to its closed passage of cooling water. Therefore, in general, the axial type is used for automobile engInes.
The vicinity of the spark plug hole exposed to heavy heat load js provided with ribs and fins effectively arranged for increasing its radiating area. Higher flow speed of the cooling water also raises cooling efficiency. The low temperature area in the vicinity of the intake port is rather heated by the cooling water, instead.

Thus, the wall temperature can be averaged over the housing and, at the same time, the mixture is preheated to increase vaporization and atomization.
To raise such effects, high temperature exhaust gas may be further led to the low temperature area of the housjng. 


Figs. 3.39 and 3.40 show the cooling water passages within the housing of the circumferential and axial flow water cooling systems for the housing, respectively.
In the circumferential flow type, the cooling water runs independently of each housing, being capable of 

Figs. 3.39 and 3.40 show the cooling water passages within the housing of the circumferential and axial flow water cooling systems for the housing, respectively.
In the circumferential flow type, the cooling water runs independently of each housing, being capable of