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Thanks, Jason.
My experiments with the Swiss muffler did not work out -
mainly because the shock wave from the turbo housing exhaust port simply
pulverized any material in the system. I tried stainless steel coarse wool
as well as a 2000 deg ceramic stuffing. Both could survive the heat and
materially reduce the harshness of the exhaust bark - but none would live past a
couple of weeks. Pulverized and blown out the end. But, that was my
experience, hopefully you will have better results. I would suggest
anything you can do to break up the shock pulse before it gets to any sound
absorption material the longer it will live.
Ed
----- Original Message -----
Sent: Wednesday, February 21, 2007 1:37
PM
Subject: [FlyRotary] Re: Another
exploding cigar??
Guys,
I tried the cone from
Jegs on my original Tangential muffler. Observers said there was no noticeable
difference. I am working on a "Swiss" muffler now, and I'm planning on trying
it again.
Jason
p.s. I am closing in
on the 60 hr mark now. All systems good. Cooling is still working a little too
good 145-150 degrees cruise. Waiting for hot
weather!
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net]
Sent: Wednesday, February 21, 2007 11:34
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Another
exploding cigar??
I have often thought
that perhaps two of those cones in a 3" tube might provide sufficient lowering
of the noise level. However, having two tubes, that would mean 4 cones
and a bit expensive.
Tracy has had
very good luck with the Flow Master Hush Power II. It has about the best
streamline combined with good sound suppression. Tracy reported it not
quite as good as the Spintech on the sound suppression but better with less
drag (and less cost).
----- Original
Message -----
Sent: Wednesday,
February 21, 2007 8:27 AM
Subject: [FlyRotary] Re:
Another exploding cigar??
Lynn, you may
have the small idea for a round spintech in your Borla. I had the
thought after looking at the cone in Jegs hot rod catalog. Has anyone
tried one of these cones, the smallest one is 3" in diameter and is
$69. If it would stand the hammering it could be mounted in a 6 or 7"
piece of stainless pipe and should not be weight restrictive.
JohnD
----- Original
Message -----
Sent: Wednesday,
February 21, 2007 12:02 AM
Subject: [FlyRotary] Re:
Another exploding cigar??
I welcome any
and all comments and criticism, as I stated, I don't have a clue how
this will work. JohnD
I think this
will be rejected out of hand. Just enough flow to get off idle but no
more. So now we have a 4" Borla stainless.
For the lower
RPM the smaller core diameter would be OK. But the least amount of
restriction possible is far better.
The Spintech
worked. It just had a bad shape. How about a round
Spintech?
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