Found the answer to the question I had the other day.  On a 6-port, why not just combine the two runners in the side housing?

From  http://www.mazdatrix.com/faq/port6p.htm

"If the separate ports (in the end housings) are simply made into one large port, the bottom and mid-range torque suffer a lot, and the port velocity is compromised as the intake flows from the manifold into the intake runner. The intake port timing of this configuration is: later on opening than a peripheral port, but roughly equal to intake closing on a peripheral port! That's a LOT of timing and port volume for a street car."


Bottom and mid-range torque are all but meaningless to us as long as it'll idle.  Right? The port velocity will only be compromised if you were using the stock intake that.  I don't know of any airplane builders doing that.  If you're building your own anyway, you'd make the runner big enough so there isn't an upstream obstruction and maintain the velocity throughout.

It seems to me that joining the outside runners on a 6-port is an excellent idea for an airplane application.  Somebody set me straight before I do something stupid.

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