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"sounds good" Mark. My guess is that the 2" restrictor is in the correct place now. Don't think it would be as effective before the muffler.
But the big question is, did the 3 to 2 " reducer cause any noticeable power loss? I plan to do the same thing on my plane when time allows.
Tracy
On Mon, Mar 9, 2009 at 8:08 AM, Mark Steitle <msteitle@gmail.com> wrote:
Mike,
It may be a little premature to declare it a winner, but with ~10 hrs on it now, it is holding up better than anything I've tried so far. Keep in mind that this is DNA's best muffler, rated for 1000hp. It is made of fairly thick SS, .030 if I recall, much thicker material than most mufflers. I had to add a 3" to 2" taper to the outlet in order for it to be acceptable in the noise category, but that was surprisingly effective in reducing the exhaust noise to an acceptable level. (Maybe I should have just put the reducer on the 3" downpipe and saved some weight.) Anyway, when it passes 25 hours, I'll post another update. At this time it is looking very promising.
Mark S.
On Sun, Mar 8, 2009 at 9:20 PM, Mike Wills <rv-4mike@cox.net> wrote:
Mark,
Any update on the DNA muffler?
Mike Wills
RV-4 N144MW
----- Original Message -----
Sent: Friday, January 16, 2009 7:05 AM
Subject: [FlyRotary] DNA Muffler
Does anyone on the list have any real-life rotary experience with the DNA Gen II muffler ( http://www.dnamufflers.com/DNA/main_DNA.html)? It is an interesting design in that it has no packing material to burn out. Instead, it utilizes ladder-rungs, which they call "internal sound diffusers", which resemble a chain of DNA down through the center of the muffler body, which is made of 304 SS. Their web site claims that the racers use them with great success. From speaking with a sales rep, they claim there the rotary crowd uses them too. I'm considering purchasing one of their FULL THROTTLE COLLECTOR mufflers (P/N 1040), but thought I would check to see if anyone else has used this style muffler. This muffler has a 3" inlet/outlet with a 4" body. So it is compact enough to fit inside my cowl. My exhaust header has a 3" swivel joint, so it should be a good fit.
Mark S.
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