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12-21-2008, 10:11 AM
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Join Date: Mar 2006
Posts: 86
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RV-8 vetterman 4-pipe install
Here are a couple of pictures of my 4-pipe system in my -8. The exhaust is very nice quality. Having a little welding experience myself, I'd say these welds are flawless. My question is: I'm about to cut the steel support tube to length to support the lower half of the exhaust. Before I cut, I wanted to ask the forum to see if my placement looks to be acceptable. The 4-pipe system only comes with one strut to vertically support the two pipes. Thanks for your feedback.
-Brad

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12-21-2008, 11:42 AM
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Join Date: Feb 2007
Location: League City, TX
Posts: 595
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Support attach point
You may want to reconsider using the engine mount to support the exhaust pipes. Supporting the exhaust from the engine might be a better method, but check with Vetterman for his recommendation.
__________________
R. E. "Ernie" Butcher
Friends of the RV-1/Eagle's Nest Projects
"Mentors build the student...
Students build the airplane." -Glen Salmon
Dedicated to the historical preservation of the RV-1 Aircraft
and organized for the purposes of promoting, supporting,
fostering, and engaging in aviation and aerospace education.
www.RV-1.org
www.EaglesNestProjects.org
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12-21-2008, 12:14 PM
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Join Date: Mar 2005
Location: St. George
Posts: 973
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RE:RV7A 4 pipe
Hi Ernie
I have the 4 pipe on my RV7A and the recommended procedure was to use the provided fastners, which use the motor mount tubes as secure points.
Haven't flown yet...but Larry Vetterman told me he uses the four pipe set up on his plane.
Frank @ 1L8 ...RV7A... painting still.....looking for some warmer weather!!!!
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12-21-2008, 01:37 PM
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Join Date: Jan 2005
Location: Battle Ground, Washington
Posts: 138
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I used the sump bolts
I recommend using the rear sump bolt(s) to support the exhaust pipes. That way the exhaust and engine move together but the exhaust is still supported. I supported the two-pipe Vetterman exhaust from the sump bolts in my RV-8 and that has worked very well for more than 500 hours. Supporting the exhaust pipes from the engine mount as you have illustrated will put a lot of stress on the exhaust system whenever the engine shakes during start up and shutdown.
Dan
RV-8 530+ hours
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12-21-2008, 03:20 PM
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Join Date: Mar 2005
Posts: 5,685
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What does the front end look like
I am considering a different arangemant than the "cross-over two pipe" that I have on my RV-6A and this may satisfy my needs. If it eliminates the crossover and can bbe routed straight back without having to come inboard where the current cooling air outlet is located it would be ideal. Do you have photos of the rest of the pipe routing?
Bob Axsom
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12-23-2008, 08:58 AM
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Join Date: Mar 2006
Posts: 86
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Quote:
Originally Posted by Bob Axsom
I am considering a different arangemant than the "cross-over two pipe" that I have on my RV-6A and this may satisfy my needs. If it eliminates the crossover and can bbe routed straight back without having to come inboard where the current cooling air outlet is located it would be ideal. Do you have photos of the rest of the pipe routing?
Bob Axsom
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Bob, I took some aditional pictures for you last night. -Brad Vier

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12-23-2008, 10:28 AM
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Join Date: Jan 2005
Location: Las Vegas, NV
Posts: 488
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My 7A Vetterman 4 pipe system
included two rubber "donuts" to be placed in the mounting straps between the motor mount and the pipes. I too would be concerned about mounting the end of the pipes to the motor mount, and the flange of the pipes to the engine. Too much relative movement for me.
__________________
Terry F.
RV 7A N457RV
250 hours and lovin it! 
Southern Nevada EAA Chapter 1300 - www.eaa1300.org
Paid VAF 03/17
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12-23-2008, 10:39 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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The two pieces of metal tubing you show in the first photos are joined by a short piece of rubber hose, correct??
This will allow movement between the pipe/engine assembly, and the mount.
I would cut the tubes a bit shorter, leave a half inch gap or so when inserted into the rubber tube----will allow more freedom of motion if the ends of the metal tube dont bump into each other.
Good luck.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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12-24-2008, 08:22 AM
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Join Date: Jul 2007
Location: Keller, TX
Posts: 1,553
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Quote:
Originally Posted by frazitl
included two rubber "donuts" to be placed in the mounting straps between the motor mount and the pipes. I too would be concerned about mounting the end of the pipes to the motor mount, and the flange of the pipes to the engine. Too much relative movement for me.
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Any pictures of the donuts or a scan of the drawing from Larry? I've installed an AWI 4-into-1 and am not satisfied with the way I've supported the rear of the exhaust.
__________________
RV-8 180 hp IO-360 N247TD with 10" SkyView!
VAF Donations Made 8/2019 and 12/2019
"Cum omni alio deficiente, ludere mortuis."
(When all else fails, play dead.)
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12-24-2008, 08:36 PM
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Join Date: Jan 2005
Location: Las Vegas, NV
Posts: 488
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I'll take and post some photos tomorrow. Larry's drawing is not his best work (but the pipes are beautiful!).
__________________
Terry F.
RV 7A N457RV
250 hours and lovin it! 
Southern Nevada EAA Chapter 1300 - www.eaa1300.org
Paid VAF 03/17
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