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10-26-2013, 11:14 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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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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rgmwa
RV-12LR 912ULS
120346
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10-27-2013, 09:00 AM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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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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Actual repeat offender.
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10-28-2013, 07:57 AM
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Join Date: Aug 2008
Location: Texas, Fort Worth
Posts: 1,237
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Not a problem so far!
500 hrs and no problems with exhaust. 
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John
RV12 N1212K
Flying Since June 2010
1020 Hours as of 9/30/2017
Johnrv12@icloud.com
RV14 Wing, arrived and building at Rdog's new Hanger at 16X
S/N 140014
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10-28-2013, 08:55 AM
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Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,657
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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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John Bender
Flying RV-12 - Serial #120036
Paid in May ( 5-2020 )
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10-28-2013, 03:18 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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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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rgmwa
RV-12LR 912ULS
120346
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10-28-2013, 05:08 PM
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Join Date: Jul 2009
Location: High Wycombe, UK
Posts: 288
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Quote:
Originally Posted by rgmwa
An experienced A&P (Australian equivalent anyway) saw a picture of my engine installation
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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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Jerry Parr
England
Ex RV-12
Loving Rotax....
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10-28-2013, 07:11 PM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Quote:
Originally Posted by aerofurb
Rotax experienced...?
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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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rgmwa
RV-12LR 912ULS
120346
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09-05-2020, 08:34 AM
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Join Date: Mar 2010
Location: Colorado
Posts: 10
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What is the best way to reducE oil on the bellgy coming from the exhaust pipe
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09-05-2020, 09:06 AM
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Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,365
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Probably not the answer you are looking for but this works well

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Tony
E-LSA RV-12 ULS
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09-05-2020, 09:34 AM
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Join Date: Sep 2006
Location: Windsor, California
Posts: 924
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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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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)! 
V AF donation through June 2021.
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