Better picture of the exhaust and intake manifolds.
Why three exhaust pipes? Yes I know there are
exhaust ports in the center housing.
I guess it is cheaper to make than four pipes.


Paul Lamar

Paul,
I don't think it is cheaper, it certainly doesn't look cheaper !
Many motorbikes have double pipes, mainly used as a heat shield.
Perhaps this is the reason here ?
I guessing from the photo's it's a one piece flange, perhaps the heat shield
helps to minimize heat fluctuations, and the possibility of cracking.
The extra meat would add some strength also.
Just a thought, may be completely wrong.
George (down under)

I know what the outer shell is for. Keeps the pipe hot so the cat
starts working earlier.

Paul Lamar

The center housing is relatively narrow, so the exhaust ports
there would have to be narrow.  One pipe covering both.
Is it possible the two rotors share the same exhaust port in the
center housing?

--
Perry Mick
Duckt N7XR
http://www.ductedfan.com

Could be. You would get interference in the pipe and perhaps that
is the reason for the third center pipe. Course it could be a heat
durability thing too although the exhaust temp should be much lower
with the later RX8 exhaust port timing. That exhaust manifold looks
light weight enough to use in the airplane. Another place Mazda got
some weight out of the engine. That also looks like a real low gas 
velocity, free flowing exhaust system :-)

Paul Lamar
 
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