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FWIW, the
people at Racing Beat said that the Renesis is a very different animal than
peripherial exhaust port rotaries when it comes to exhaust systems. As I
recall, they said they got only about an 8 HP improvement when going from stock
(RX-8) exhaust system with cats & the works, to a full race setup with
headers, race mufflers, etc. That is TINY in comparison to the earlier
engines.
In other words, the Renesis is very non-critical when it
comes to exhaust systems. Just keep the back pressure down and you'll do
pretty well. At least that was my conclusion. Note there is zero
overlap in intake / exhaust cycles in the Renesis.
BTW I'm still waiting
for someone to build & test a peripheral intake port Renesis. I think
that would be a great setup for aircraft applications.
Tracy
Paul Lamar had a PP Renesis built. I think he got
about 240 hp. He used a carb, and the bsfc was terrible. I'm not sure how good
the data was. There are graphs on his web page. There used to be a
youtube vid of it, but it may be only on his site now.
I don't think it is worth fooling with unless you
also port the exhaust. There is enough meat
in the four port motor to open it up to the 6 port exhaust config, but the shape
is still terrible.
If you look at the port interaction, the path
between the exhaust and intake is so torturous that I'm not sure you would get
any crossover tuning like you do with PP exh. even with the added overlap.
With the PP engine you have the glowing hot
spaghetti problem to deal with, and the muffling issue.
Monty
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