Mailing List flyrotary@lancaironline.net Message #30135
From: M Roberts <montyr2157@alltel.net>
Subject: how to attach a muffler
Date: Sun, 12 Feb 2006 20:56:45 -0600
To: <flyrotary@lancaironline.net>
Monty, that is great info. 
 
The turbo - engine is good.  I use the stock manifold that is very beefy iron and a very short moment arm. 
 
From the turbo outlet I currently have a 16G 321SS down pipe that is about 18" long going right down out of the cowl.  Easy enough.
 
I plan to hang the muffler under the cabin, so all I need is one bend going from the current down pipe to the muffler, about 2' away (with another small bend just before the muffler for alignment).  I was thinking a slip joint onto the down pipe, then another onto the muffler. 
 
 
This should work fine if I am envisioning it properly. Something like what Lynn posted should work fine for your slip joints. No need for the metal bellows after the turbo. All they do is seal the slip joint. They are just a really thin metal tube formed like an accordion. It is welded on the upstream side and downstream side of the slip joint to seal it. Then a flange for a V-band is welded onto the joint for the solid attachment. When used in this fashion, some means to control expansion under pressure is required. Otherwise it becomes a piston. Not a concern in your case. This would be an issue if you were making a new manifold between the engine and turbo. 
 
Bernie's ground straps are what I was after when referring to wire rope. Same difference with a lower price tag. Also you don't have to worry about the silicone degrading from high temps. I think they would be preferable for this reason.
 
Just make sure you are not asking the attach point at the turbo to do double duty as a structural element and hot gas conduit. Don't give it anything to constrain its motion under expansion and contraction and it should be fine.
 
 
Can v-bands be used INSTEAD of slip joints?  That would work great and be easy to do.
 
No, you need the slip joints to allow relative motion. The V-band is just a nice clean way to attach things.
 
 
What is a manifold?  Can you send me a link to one?
 
 
Not sure what you mean-did you mean metal bellows? see:
 
to get an idea what I am talking about look under braided connectors.
 
 
Thanks for your help.
 
No problem, just remember it may be worth what you paid for it ;-)
 
Monty
 
 
Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster