----- Original Message -----
Sent: Friday, August 25, 2006 5:42
PM
Subject: [FlyRotary] Re: Exhaust
system
Chris,
My manifold is stuck under the cowl mockup for at least
another month and I do not have any pictures. Maybe Dennis can post a picture
of his. He is using a swirl pipe and I am going to try a 180 deg bend to get
the exhaust pointed in the needed direction. The muffler is cool but the
exhaust manifold and pipe are very hot. We are both going to try the muffler
inside the cowl with heat shielding and some air blowing over everything.
Using a cut down stock manifold there is only one pipe and no
collector
I have concerns about heat in the cowl after
shutdown with this arrangement. We shall see.
Bobby
Bobby,
How long are your pipes before the muffler?
Are either of you putting the muffler inside the cowling? If it runs
that cool, it shouldn't be a problem.
Chris
----- Original Message -----
Sent: Friday, August 25, 2006 4:08
PM
Subject: [FlyRotary] Exhaust
system
Chris,
If I remember correctly you have a Renesis. After
hearing Dennis's run-up to 5100 rpms last week I am planning to use the same
muffler he has. Here are the specs he gave me.
Hushpower II
Flowmaster Performance
Resonator
12512400
2.5 in. inlet/outlet
409 SS construction
This
little muffler sounded much deeper and quieter than I expected. No level
measurements but it was not unpleasant. We are both modifying the stock
exhaust manifold but are trying two different methods of attaching the
muffler to it. Will it hold up is another question.
Bobby
(engine still under sheetrock mud) :)
I've looked back through the archives, and seen
lots of different ideas for exhaust systems. But no real definitive
answers.
There is the Cool tube exhaust that has very
short pipes,like Bob White posted.
There is the medium length, no muffler system
like Buly has or like Joe Hull has mocked up.
There is the really long tubes with muffler
hanging under belly like Tracy has.
Do we know what the correct length tube is to
tune the exhaust for our RPMs? Does this length include the
muffler?
It appears the diameter most used is from 1.5
to 2".
What about the different mufflers?
I only found two mufflers named in the archive that guys are happy
with, the Flowmaster Hushpower II, and
the Moroso Spiral Flow Racing
Mufflers. Last year at Shady Bend, Monti
talked about noise levels and testing different mufflers and pipes.
Are there ant results from that?
I'm ready to start mocking up my exhaust, so am
seeking the collective wisdom of the group.
Chris
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