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  #1  
Old 10-26-2013, 11:14 PM
rgmwa rgmwa is offline
 
Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
Default Exhaust pipe query

An experienced A&P (Australian equivalent anyway) saw a picture of my engine installation on another forum and made the following comment:
"... the way the exhaust pipe outlet hangs off the end of the exhaust 'can', will cause it to crack the can badly ( trust me,...been there, done that !) ...solution:....weld a 1" steel strip from the exit pipe to the little bit of steel by where the front pipe goes into the top of the can.........end of problem."

I can see what he's getting at, and was wondering if anyone has experienced any problems in this area, such as cracking in the welded joint where the exhaust pipe connects to the muffler?
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  #2  
Old 10-27-2013, 09:00 AM
aerhed aerhed is offline
 
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Location: Big Sandy, WY
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Default

I maintained a diamond HK36 that cracked off there twice and cracked the other end twice in 3 years. The shop that had reinstalled the engine had a misalignment of the exhaust hangers. Relieved the alignment issue and it never happened again.
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  #3  
Old 10-28-2013, 07:57 AM
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Jetguy Jetguy is offline
 
Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
Default Not a problem so far!

500 hrs and no problems with exhaust.
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  #4  
Old 10-28-2013, 08:55 AM
JBPILOT JBPILOT is offline
 
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Location: Jesup, Iowa
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Default Might be - -

how much of the tail pipe you cut off. If left in full original length, could cause a problem. I'm close to 600 hours, and nothing yet.
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  #5  
Old 10-28-2013, 03:18 PM
rgmwa rgmwa is offline
 
Join Date: Feb 2010
Location: Perth, Western Australia
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Default

Thanks all. I've got no reason to doubt what I was told, and I'm sure if there were problems they would have been reported here. Maybe it's something to add to the annual checklist.
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  #6  
Old 10-28-2013, 05:08 PM
aerofurb aerofurb is offline
 
Join Date: Jul 2009
Location: High Wycombe, UK
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Default

Quote:
Originally Posted by rgmwa View Post
An experienced A&P (Australian equivalent anyway) saw a picture of my engine installation
Rotax experienced...?

An on-going problem is Lycoming/TCM experienced A&Ps (and Australian/European (including very much UK) equivalents) passing judgement on Rotax engines/installations that they aren't familiar with.

Believe me, they are very different and what might be bad news for a heritage engine/installation doesn't mean doom for a Rotax.

Muffler is a standard Rotax design and they probably know what they are doing...
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  #7  
Old 10-28-2013, 07:11 PM
rgmwa rgmwa is offline
 
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Location: Perth, Western Australia
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Quote:
Originally Posted by aerofurb View Post
Rotax experienced...?
Rotax plus the others I believe, but I don't know him personally. Just thought it was worth raising here to see if anyone has had any problems.
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  #8  
Old 09-05-2020, 08:34 AM
Conifer Conifer is offline
 
Join Date: Mar 2010
Location: Colorado
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Default

What is the best way to reducE oil on the bellgy coming from the exhaust pipe
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  #9  
Old 09-05-2020, 09:06 AM
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Tony_T Tony_T is offline
 
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Location: Lacey, WA
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Default

Probably not the answer you are looking for but this works well

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  #10  
Old 09-05-2020, 09:34 AM
DHeal DHeal is offline
 
Join Date: Sep 2006
Location: Windsor, California
Posts: 924
Default

I suspect that the oil on your aircraft's belly is not coming from the exhaust pipe but rather it is oil mist coming from your oil tank breather tube and your engine-driven fuel pump venting tube -- a slight amount of oil misting from these tubes is normal. Be sure that the exit points of these two tubes are properly located per the plan's spec.

As Tony noted above Extreme Simple Green (the one that is safe for aircraft use) is really effective in cleaning off belly oil and grease.
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