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I may not be Mr. Muffler, but I have a copy of the
spiral flow on my 13B powered RV-4 too. Home made from Inconel, it is holding up
OK but doesn’t muffle worth a damn. A friend has a Cobra kit car with spiral
flow sidepipes on a more or less stock 302. They don’t work worth a damn
either.
After Mark switched to the DNA muffler and reported
positive results I switched too. The DNA was no quieter but cost me some power.
So I switched back. Still looking for the right muffler solution that will fit
in my extremely space limited application without costing too much power. In my
opinion this is the biggest downside with my rotary install.
Mike Wills
Sent: Friday, July 09, 2010 2:44 PM
Subject: [FlyRotary] Re: Mufflers
Steve,
Yes, that would be me, "Mr. Muffler" himself. The Moroso style
muffler didn't muffle very well and it kept melting the bolt holding the baffle
in place. I finally went with a SS bolt which didn't melt. In an
effort to find something that wasn't as noisy, I discarded it for the DNA
muffler which wasn't much quieter, but it survived the harsh rotary environment
better than anything else I had tried up to that point. I'm now running an
inconel 625 tangential muffler, which is the best as for noise attenuation I've
used to date. The only problem is that I suspect I'm losing hp due to
excess back pressure. But at leaast I can hear to talk on the radio.
Its my opinion at this stage of the game that the best muffler is a turbo.
At least you achieve a fairly quiet exhaust note, and get some extra hp
too.
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