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GrummanDude
Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA
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 Posted: Wed May 16, 2007 11:18 pm Post subject: Exhaust system |
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Cliff, I am doing an annual on a Tiger with a Dawley muffler. It too
is hitting the cowling. This hits at about the 9 to 10 o'clock
position. I wonder if the tooling is messed up.
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from AOL at AOL.com.
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_________________
Gary
AuCountry Aviation
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flyv35b(at)minetfiber.com
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| Posted: Thu May 17, 2007 4:51 am Post subject: Exhaust system |
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On the Tiger I just installed the rebuilt muffler on the outlet pipe hit the
cowling at the aft end and slightly to the inside of the original slot.
Essentially the pipe is welded on to the can at to acute or shallow of an
angle. Probably 5 degrees off would do it. I talked to Steve at Dawley
(the salesman) and he wanted to argue with me about maybe it wasn't the
fault of the muffler! But did say that if I sent it back they would build a
new one.
The customer did not want to wait that long and since he is planning on
installing a Power Flow exhaust later on we decided to enlarge the hole in
the cowling to fit since it will be patched later on. I had to cut
completely through the inside doubler ring and about 1" aft of that to get
even a reasonable amount of clearance around the pipe. In total the hole
was elongated about 2" further aft and skewed to the inside. I riveted a
doubler back on the inside to regain most of the rigidity from cutting out
the original doubler ring that is spot welded on. I had the cowling off and
on at least 4 times to get the hole the right size without making it any
larger than necessary. The now larger hole at the front of the pipe should
probably be covered with baffling material or a fairing like Plazak sells,
at least to make it look better.
Dawley was the manufacturer for Tiger aircraft mufflers on the AG5B and I'm
wondering if there is a difference or something was changed for them from
what the old AA-5B configuration is. I took some pictures and am planning
on writing a letter to Dawley about the situation. And based on this
experience I'm not sure I want to buy any more mufflers from Dawley.
Cliff A&P/IA
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Discover
Joined: 26 Feb 2007
Posts: 429
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flyv35b(at)minetfiber.com
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| Posted: Thu May 17, 2007 6:21 am Post subject: Exhaust system |
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Not a bad idea. I think I'll do that.
Cliff
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