> I haven't seen this posted before. The RX8 exhaust manifold is double> walled with air space between besides having a bolt on heat shield. > Karibian

I got a stock manifold with my Renesis engine.  It has an inner,
"floating" tube of thin stainless, then a thicker steel outer shell anda heat shield.  The whole thing weighs about 15 lb.  I cut mine downjust after the first bend, which removes the last foot and the
very-heavy flange.  If one cuts just the outer shell, the inside tube
will stick out about 2", which is the location of its normal slip joint.  I also cut the excess iron out from between the flanges (the hot air
ports), and ended up right at 8 lbs total.

The manifold is pointing in the right direction for a pusher
configuration, which is good for my case.

I'm working with Ed to pipe the exhaust into a muffler (probably VAM
style), then an exit pipe.

Scott Gettings

The Star Mazda cars use BIG pipes.

Paul Lamar

Wow.  Look how close the pipes are to the heat exchangers!

Scott Gettings

I agree. They are not too swift on the technical stuff.
The oil rad is as large as the water rad and they wind up
tapeing up the openings. They tend to use the sledge hammer
approach to cooling. Use a bigger core and a larger opening
and damn the aero drag.

Never the less these cars, with their stock LOW POWER RX8 engines
with stock manifolds, at lap times of 1 minute 20 seconds, are among
the fastest road racing cars around. Imagine what they could
do with high power, turbos or p-port engines for that matter.
A $250,000 Porsche RS Spyder racing car can only get around
in 1 minute 13 seconds.

IMHO this is the type of racing Mazda should spend their money
on. There is no arbitrarily high weight minimum. It show cases
the high power to weight ratio rotary engine to great advantage
when the public sees how fast these light weight cars really are.

IMSI American Lemans series will
handicap the rotary every time. Never the less the 3 rotor
Road & Track entry finished fourth in P2 class. Great job by
drivers Jami Bach and Guy Cosmo. Not bad for a cast iron 15 year
old 3 rotor street car engine racing against tiny unobatainium
pistons, eight cylinders, 4 over head cams, 32 valves, 64 valve
springs, etc. etc. out and out racing engines turning 11,500 RPM.

Paul Lamar ...No rotor no motor.

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