Date: Sun, 31 Jan 1999 16:23:57 -0800
From: Paul <rotaryeng@earthlink.net>
To: z <rotaryeng@earthlink.net>
Subject: Dynamic Chamber Intake manifolds

Paul Yaw wrote:

The best way to deal with this is to wait until someone is ready to
build a 6-port.  After the engine is built, an adjustable length
manifold can be constructed, and the length varied on the dyno.  It
would be most appropriate if we used Tracy's computer since that is 

most

likely what everyone will use in the future.  Since no one, including
myself wants to go into the manifold business, the results should be
posted to the webpage.  Everyone will then have access for future
projects.  Unfortunately the 6-port is here to stay.

Paul Yaw

I think that is a good idea Paul. IMHO the six port has the potential
to be better than the four port because there is more iron in the
end housings to be ground away to make the end ports flow more air.

I am working on a design for a slide throttle that might mitigate
the idle problems of the bridge port. If we can get it to idle
OK at 2000 RPM that should be all the aircraft people need as 
most are running a 2.17:1 PSRU so the prop RPM would
only be 920 RPM. Not a lot faster than your average direct 
drive aircraft engine. What does it cost to do a bridge port?

As I recall Tracy is already idling at 1500 RPM or so for
one reason or another.

Paul Lamar
 
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