Do they always bore the port at an angle rather than straight from
   the side?
   Can one request a port bored from the side?
   Joe Berki

    >
    >
    > Does anyone know what diameter the P Port housings are that RB sells?
    > ID, OD ?
    > Thanks for any help
    >
    > Joe Berki
    > Limo EZ
    >
    > My guess is BIG :) I'll forward this to Jim.
    >
    > --
    > Paul Lamar ...No rotor no motor.


   Do they always bore the port at an angle rather than straight from
   the side?
   Can one request a port bored from the side?
   Joe Berki

   I'll send that question too.

   BTW My machinist friend is boring out a junk rotor housing as we
   speak. If you want them straight in send them to him and he will do it.
   His shipping address is:

   Jim Poole Care of:
   Light Speed Engineering
   416 E. Santa Maria Street,
   Hangar #15, Santa Paula, CA 93060

   So far he has done four and is in the process of doing another one
   for me. I just
   bought him a high quality 1-7/8 inch hole saw to speed the process.
   I am building a
   test junk rotor housing which I will have the SS tubes trial tig
   welded to the steel liner.

   Mark Steitle is also working on this idea in Austin but I thought
   two separate efforts won't hurt. Mark is an excellent tig welder.

   If that works we are going to build up an RX8 p-port engine and test
   it on
   the Mazdatrix dyno.

   Probably be a four port low power engine as they are probably
   cheaper than the
   six port high power version. We don't care if it has only four side
   ports as we
   won't be using them anyway. It should idle great as it is
   a second or third gen engine in reverse. P-port intake with side
   port exhaust. Also the fuel burn should be 8% lower as the raw
   unburnt fuel is still recycled by the side exhaust ports.

   Paul Lamar ...No rotor no motor.



   Hi Paul,

   Minimum diameter - 1.713", tapering before and after. If you don't
   bore at an angle, it is much harder to seal against the inner wall.
   Mazda factory race housings were straight in from the side. There was
   no power difference.

   Jim Mederer

   Thanks Jim.

   Paul Lamar

   Paul,

   I really like the idea of the Renesis (RX8) engine with its side
   exhaust ports. I was just reading how the two side exhaust ports
   combined have almost double the exhaust port area of the P-port
   exhaust on the previous generation engine (13B).

   They claim the change in port timing gives a longer expansion cycle,
   which improves thermal efficiency. I can believe that.

   Another thing I like is that it lowers the exhuast gas temperature.
   This is especially significant for a turbo engine, where you could
   have big issues with the high exhaust temp.

   Adding P-port intakes to the RX8, idling should be very clean as you
   say. Not to mention the extra power. Btw, I was very surprised to
   learn that the so-called "high power" six port version of the RX8
   puts out almost 250 hp at 8500 rpm.

   The P-port also simplifies the intake manifold and carburetion. I
   wonder if the Bing carbs that come on Rotaxes would be big enough?
   (One for each rotor).


   Regards,

   Gordon.

They have backed off on the 250 HP claim. It is now 232 HP.

Paul Lamar ...No rotor no motor.

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