Ken Knevel wrote:

Paul -
Please add me to the rotary newsletter list. See attached 20b intake manifold design I'm
developing with Bruce Turrentine. All made from alum. tubing (except the engine and throttle
flanges).

Paul Lamar responded:

Nice design and rendering but I asked Bruce Turrentine at Sun N Fun if he had them for sale and
he said no.  It is real hard to make the transition from round tube to oval If you just squash a
round tube to an oval. The area of the oval becomes less than the area of the round tube. This
is particularly true with the narrow center ports. The other sticky point with this approach is
the very narrow wall between the center ports. It is real hard to fab this using tubing.

Other problems:
The off-center attachment of the port tubes to the throttle body tube will promote swirl.  Is that
desirable?

The position of the injectors opposite the port tubes may promote non-uniform mixture
distribution.  Port(s) near the throttle body end will be lean versus the far ports being rich.

Russell Kent

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