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).

Thanks -

Ken Knevel

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. That is the reason I decided to bite the bullet and do a casting.
A third problem is the junction of the tube where they enter the plenum.
A bell mouth in this junction is called for as it adds 5% to the HP.
Power Sport proved that with their manifold. Again a casting or lathe 
turning is called for.

You could use two ACRE manifolds, cut one in half and weld them into a 20B manifold.

Another reason for doing a 13B casting is to fit a stock low cost 89-91 Mazda
turbo charger and exhaust manifold. This reason does not apply to
the three rotor as there has never been such a suitable turbo charger
available for the three rotor. The sequential 20B turbo charger
is too heavy and unsuitable for aircraft use.

BTW Tracy, how come you have not mentioned the ACRE manifold and injector runners
on your web site?

Paul Lamar
 
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