How many people are building side port 13B? 4 port? six port? Side
    port RX8 motors? 4 port? 6 port?

    Paul Lamar


    Hi Paul I am building a 6 port RX8

    Bruce

    You will need some center transitions. I'll get Jeff started on
    making those and intake flanges they can be tig welded to. Do you
    have the stock RX8 intake manifold?

    Paul Lamar


    Yes, I have the stock intake manifold

    Bruce

    You can see from this picture it is not useful for a cut down
    kludged up aircraft manifold.


    I'll work on a fix and maybe Jeff can make some parts next week.


    Paul Lamar

    --

My initial plan was to cut the intake manifold in the same place shown in the photo.  The rx8 runs all six ports open at 6250rpm. With all six ports open I would think the engine would not idle as well (not too big of an issue with airplanes).  I was also thinking of leaving the APV valves in to allow for smoother transition into the rotor housing.  I was planning on using the parts of the original intake manifold to try and keep installation costs as low as possible.  However, I will be rebuilding the engine since I don't know what kind of condition it is in and like Paul has been saying if you are going to be rebuilding you should consider the P-Port.

I wasn't too familiar with P ports until I saw this post and started reading about it.  It would definitely save on manifold costs/weight (and extra power would be nice) but I'm not a good enough welder/machinest to want to try and tackle putting the P-port in myself (plus I think a botched P-port would cost more than messing up kludged intake manifold. I would be interested if Jeff can make a better manifold and maybe i can be convinced to do a P-port.

Scott

Jeff has a welder guy that will weld them in for $20 each.
Actually it is rather easy to tig weld steel.


I would go with the p-ports as side ports are always a crap shot on how much
power you get.  P-ports really pay off at 12K  to 14K  alt.cruise.

Did you read this?

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

Also if you need any  parts tig'ed my part time guy is an expert and I can guide him.
Let me know what you need and I will give you a fixed price.

That stock RX8 intake system is a work of engineering art.

What kind of airplane are you building Scott?


Paul Lamar


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