Tom Kendall wrote:

Manifolds:  I've been working on a layout for the 20B

intake manifold

and am thinking of a radical departure.  If I join the two runners
from each rotor right at the manifold it will simplify the tubing
(half the runners), the casting (avoids all the bolts in or

near the

runners), and makes for a generally cleaner layout.  It will also
require larger diameter runners to port the air.  BUT.... are there
any compelling reasons to keep the runners separate all the

way back

to the plenum?

I think this may work just fine if the cross sectional area of the runners
is kept similar before & after the "Y" . i.e., sum of two small runners =
area of large runner.   The port timing  (inside & outside) is very close on
all the turbo engines (all 20Bs were turbo) so the pulses should sync up
fairly well.

I vote 'yes' for the simesed runners on the 20B manifold.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

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