Subject: intake manifold knuckle??
From: Rotary Engine
Date: 8/16/2006, 10:53 AM
To: AA-me


    >
    > Paul what would happen if I used round aluminum spheres like these
    > as knuckles to get my intake runners closer to the engine. My intake
    > manifold is the Racing Beat 6 port manifold it's a little on the
   high
    > side I think I may not have to much of a problem as I'm building a
    > Long Ez and I think I'll have room if i need to make the runners a
    > little higher.
    >
    > Anytime you force the air to make a sharp right angle you loose
    > big time. Are you using the Weber carb it is designed for or
    > EFI? If EFI I would lenghten it and go stright up through the
    > cowl with a ram air scoop on top like most race cars use.
    > That manifold is designed for 9 or 10 thousand RPM.
    > --
    > Paul Lamar ...No rotor no motor.
    >
    > I plan on going EFI. Why wouldn't the sphere act as a plenum? in
   your drawings you use a square plenum with the ram air scoop how
   does it know if it is round or square? Also with that ram airscoop
   where does the airfilter go or does it need one? BTW that sphere is
   4"in dia.

   Tony

   In order to work as a plenum they would have to be connected together.
   If that happened the intake runners would in effect be very short.
   Too short to generated much power to speak of. Very similar to
   a cut off RX8 manifold. The Racing Beat six port manifold
   relies on the fact the Weber carburetor is of considerable
   runner length and the velocity stacks mounted on the top of them
   also add considerable runner length.

   How about something like this?
   --
   Paul Lamar ...No rotor no motor.


In order for a chamber to work as a plenum, doesn't the volume of the
chamber have be relatively large compared to the volume of air injested
by the engine on each stroke?


Regards,

Matt-

Something like that.

Paul Lamar ...No rotor no motor.

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