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The six port will supposedly make 248 HP 100% stock. This is at about
9000 RPM, however. The four port does not make as much HP stock.
I am working on a carbon fiber composite manifold for the 6 port that
(hopefully) will emulate the stock manifold with all the valves open.
CNC machining of the molds will commence the beginning of March. We CNC
machined a foam test mold a few months ago. We did a test layup of the
carbon fiber about a month ago.
Attached is a picture of the CAD rendition of the six-port manifold. As
you can see, it will use the stock throttle body, stock injectors, stock
injector rails, and will be 100% bolt-on. Should weigh about 3 pounds.
(Stock manifold weighs 22 pounds.) High temperature epoxy will easily
withstand 300 F. Back-of-the envelope calculation says the burst presure
on the carbon fiber tubes should be well over 10,000 psi.
The goal is to make a lightweight manifold that will hug the top of
the engine and will simply bolt on.
It is going slower than I would like, but I am working on it in my
spare time and trying to keep the costs down.
Bill Dube'
randy echtinaw wrote:
Gentlemen,
I have the opportunity to purchase a 4 port or a 6 port RX-8 engine. I thought I wanted a 4 port because I thought it would be easier to muffel. I just heard a "rumor" that the 4 port is junk and go with the 6 port. I need 220-230 hp using the 2.85 PSRU, no turbo. I would consider P-porting if absolutely necessary to get the HP. Obviously, I know very little about engines and want to start with the best I can get so, considering my needs which one do I want?
Thank you,
Randy
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