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Broken Exhaust Hangar (Again)

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kboatright1(at)comcast.ne
Guest

Posted: Sat Nov 25, 2006 5:44 pm Post subject: Broken Exhaust Hangar (Again)

Once again, I discovered a broken exhaust component  on my 160 HP -6.  Previously, I've broken the little crimped brake lines  that Vetterman provides as part of the system. I've also broken the little 1" or  so aluminum angles that you use as part of the assembly that ties the pipes  together.

  

 Today was another failure of the little  aluminum angles. The only problem it caused was a slight rise in CHT, probably  because part of the air outlet was blocked, and obviously, there was nothing  keeping the pipes from moving laterally.

  

 Anyway, I think I'm going to get two more of the  heavy duty exhaust clamps from Vetterman and use them, a couple of bolts, and a  piece of welding hose instead of the 2 aluminum angles, 2 pieces of brake line,  and 4 bolts that keep the pipes from moving laterally.

  

 Anyone got a better idea?  Three failures  in 430 hours tells me that this system needs to be reworked.

  

 KB

    [quote][b]

rocketbob(at)gmail.com
Guest

Posted: Sat Nov 25, 2006 6:40 pm Post subject: Broken Exhaust Hangar (Again)

Yep, use a piece of 6061T6 bar, .250" thick, .750" wide, maybe 6" or so long to tie the pipes together.  I kept breaking those angles early on and followed the "when in doubt build it stout" rule and haven't had any problems in 600 or so hours since.  Once I tied the pipes together solidly then the other hangers quit breaking.  There's still enough "give" to allow for thermal expansion or movement. 



Regards,

Bob Japundza

RV-6 flying F1 under const.



On 11/25/06, Kyle Boatright <kboatright1(at)comcast.net  (kboatright1(at)comcast.net)> wrote:[quote]       Once again, I discovered a broken exhaust component  on my 160 HP -6.  Previously, I've broken the little crimped brake lines  that Vetterman provides as part of the system. I've also broken the little 1" or  so aluminum angles that you use as part of the assembly that ties the pipes  together.

  

 Today was another failure of the little  aluminum angles. The only problem it caused was a slight rise in CHT, probably  because part of the air outlet was blocked, and obviously, there was nothing  keeping the pipes from moving laterally.

  

 Anyway, I think I'm going to get two more of the  heavy duty exhaust clamps from Vetterman and use them, a couple of bolts, and a  piece of welding hose instead of the 2 aluminum angles, 2 pieces of brake line,  and 4 bolts that keep the pipes from moving laterally.

  

 Anyone got a better idea?  Three failures  in 430 hours tells me that this system needs to be reworked.

  

 KB

    [quote][b]  www.aeroelectric.com http://www.matronics.com/Navigator?RV-List [b]

stein(at)steinair.com
Guest

Posted: Sat Nov 25, 2006 7:01 pm Post subject: Broken Exhaust Hangar (Again)

Quick  question....are your hangers still mounted to the engine mount?  If so I'm  afraid you'll probably still continue to break them (as many of us experienced  repeatedly).  You need to make sure the hangers go up to the engine case  instead of the mount.  If you're already doing that, then I don't know  exactly what the deal is....

  

 Cheers,

 Stein.

 [quote]   --

bill(at)vondane.com
Guest

Posted: Sat Nov 25, 2006 7:57 pm Post subject: Broken Exhaust Hangar (Again)

I had the same problem early on, after about 80  hours or so.....so I made my own hangars and they have been working perfectly  now for nearly 300 hours...

  

 http://www.rv8a.com/engine/engine3.htm

  

 look toward the bottom of the page for details and  photos...

  

 -Bill VonDane

 www.rv8a.com

  

  

  

 ---

lhelming(at)sigecom.net
Guest

Posted: Sat Nov 25, 2006 7:57 pm Post subject: Broken Exhaust Hangar (Again)

I suggest to get in touch with Vetterman.  He  may have a better way of supporting the exhaust pipes since your install.   Two years ago I installed mine using the Vetterman exhaust instructions / parts  supplied from order through Vans and all the support brackets attach to the  engine and nothing touches or attaches to the engine mount.  That could be  your problem. I haven't had any problems in over 150 hours.    Larry in Indiana

 [quote]   ---

sarg314(at)comcast.net
Guest

Posted: Sat Nov 25, 2006 8:10 pm Post subject: Broken Exhaust Hangar (Again)

Larry Vetterman has a new exhaust hanger scheme which I have installed 

in my 6A (not flying yet).  It uses 2 edel clamps which attach to an 

engine mount tube and support a piece of 1/8 aluminum plate.  A rubber 

automotive exhaust support hangs from that and the stainless steel 

exhaust clamp hangs from the rubber support.  It helped a lot with a 

clearance problem I had with the exhaust pipes. 



It's flying on a few planes now. Larry thinks it may be superior.  

Having installed his standard method first, I think it is too, but only 

time will tell. 

--

Tom Sargent, RV-6A

andygold(at)rkymtnhi.com
Guest

Posted: Sun Nov 26, 2006 7:22 am Post subject: Broken Exhaust Hangar (Again)

My hanger system broke too several times. Typically  the adel clamp that attached the crimped aluminum rod to the engine mount  cracked.  This happened even through I kept things as loose as possible to  absorb the vibration.  So far I solved it by making the system even more  flexible.  I cut the aluminum tube in half and then rejoined them with a  piece of rubber fuel line held together with small hose clamps.   It seems very loose and the exaust tips easily sway back and forth by about an  inch or two.  But they are securely hung from the mount and don't fail  anymore.

  

 Andy

  

  

  

  

  

 [quote]   ---

lhelming(at)sigecom.net
Guest

Posted: Sun Nov 26, 2006 9:20 am Post subject: Broken Exhaust Hangar (Again)

Consider that the engine is vibrating and  particularly at shut down it shakes like some describe as a wet dog drying  itself.  

  

 If the exhaust is attached to the engine mount  without lots and lots of give, consider what the exhaust and engine mount are  doing to each other.  Something has got to give.  Whatever,   Can't be good for the exhaust.  

  

 I hope you can begin to see the idea why the new  Vetterman exhaust brackets attaches the exhaust to the engine and not on the  engine mount.   They want the exhaust pipes to move with the engine  and not conflict with the engine mount.  

  

 I suggest contacting Vetterman or Vans for the  latest method and attaching brackets.  Indiana Larry, RV7, +150 Hrs  TMX-O360

 [quote]   ---

Ollie Washburn

Joined: 10 Jan 2006
Posts: 56
Location: Central Florida

Posted: Sun Nov 26, 2006 9:45 am Post subject: Broken Exhaust Hangar (Again)

I hung my exhaust pipes from firewall with a piece of rubber cut from an old 

tire betweeeen two short lengths of stainless steel. Same arrangement as 

Christen Eagle has. No problems in 100 hours since change.



Ollie  6A   Central FL



---

_________________
Ollie RV6-A & Rans S7S
Central FL

HCRV6(at)comcast.net
Guest

Posted: Sun Nov 26, 2006 5:14 pm Post subject: Broken Exhaust Hangar (Again)

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