Broken Exhaust Hangar... Again

[N787TR]

I have a Vetterman four pipe system that is in an ongoing battle with my exhaust hangers... generally the exhaust wins and I end up with either a broken or kinked hanger. However, I think that rather than attach the hangers to the engine mount, I can attach them directly to then engine. If I did this, my thought would be to skip inserting the rubber hose and hold the exhaust firmly in place with the engine.

Is there a downside to doing this? More specifically, do I need the rubber hose if the hangers are attached directly to the engine?

Thanks,

[Low Pass]

Without seeing exactly what you're talking about, it sounds like you'll next be dealing with a broken exhaust pipe if you rigidly brace the exhaust to the engine (where Vetterman believed the soft bracing was appropriate). Work on perfecting the flex supports, as originally designed by Vetterman. I had to modify mine (crossover) fairly substantially, but since have caused zero issue in 1100 hrs or so.

[Neal@F14]

If you're talking about the little sections of stainless tubing with one end flattened for the bolt to go thru and the other end left round that sticks into the rubber tubing.... if there is any force at an angle against the flattened end, it will break in pretty short order. They must be positioned such that all downward force on this piece is in-line with the tubing. I went thru a couple of these pieces in rapid succession myself until I discovered this. One side kept breaking and the other side stayed good, then I noticed the side that kept breaking on the flattened portion of the tube was getting force applied at an angle. After moving the clamps around to get all the hanging force more in-line with the tubing, I've not had that side break again in more than 125 hours now.

[DanH]

There are a great many design alternatives.

[N787TR]

Thanks for the input and good comments.

[AlexPeterson]

http://www.vansairforce.com/communit...ad.php?t=75957

Several naysayers on the method described in the first post of that thread, but it is still working, although only about 120 hours on it as yet. If you don't like it, don't replicate it.

[sprucemoose]

I'm not a naysayer Alex but skeptical. What are the advantages of your method over the stock Vetterman approach (like the post at the end of your thread?)

[Norman CYYJ]

The entire engine exhaust system should be mounted to the engine not the airframe or engine mount.

[Bayou Bert]

I too did not like the small tubes running all over the
engine area to the pipes.
I think I am going to hang my tubes like the photo using tail pipe
hangers from Autozone. SS hose clamp and two bolts through the
firewall stiffener that runs at a 45 on each side.
Still trying to decide on which way to turn the cradle on the pipe.
Let the comments begin.

[DanH]

Excellent Bert...but do buy a better grade of hose clamp. Try the ABA brand from Wicks.

Factory exhaust hanger, current production Maule M-9:



And this cable loop hanger from AWI continues to be excellent: