| Remote Onan Exhaust - Extension [message #318281] |
Wed, 31 May 2017 17:04  |
TR 1
Messages: 348
Registered: August 2015
Location: DFW
Karma: -7
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Was considering setting up a sort of exhaust extension for the onan, to move the exhaust fumes farther from the coach to keep my wife happy. Was thinking along the lines of welding a threaded collar onto the Onan Exhaust muffler outlet, and a female threaded collar onto a length of flex tube similar to this:
https://www.amazon.com/Walker-40002-Exhaust-Tubing-Flex/dp/B000CQFQOM
Should be able to just screw it on like a garden hose when boondocking or whatever, then unscrew and stow when not needed.
Is anyone doing this already? Any opinions on if this is advisable?
I've considered the added backpressure that it will put on the engine, and if you go with a slightly larger tube, and keep the run below say 15', I would imagine it would be negligible. Plan to monitor some exhaust/head temps with it uninstalled and installed to see how much it raises temps. Would obviously also keep the tube out of leaf piles, etc. to prevent fires/heat damage to anything.
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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| Re: [GMCnet] Remote Onan Exhaust - Extension [message #318283 is a reply to message #318281] |
Wed, 31 May 2017 17:37  |
werewilfs
Messages: 329
Registered: July 2012
Location: Rappahannock County, VA
Karma: 0
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There were some that have used this with success. I remember reading that here I think.
https://www.amazon.com/Camco-44461-Gen-Turi-Generator-Exhaust/dp/B000BUU5XG
Jared & Stefanie Kohl
Rappahannock County, VA
1973 Painted Desert "Onslow"
On Wednesday, May 31, 2017 6:05 PM, Mark Sawyer wrote:
Was considering setting up a sort of exhaust extension for the onan, to move the exhaust fumes farther from the coach to keep my wife happy. Was
thinking along the lines of welding a threaded collar onto the Onan Exhaust muffler outlet, and a female threaded collar onto a length of flex tube
similar to this:
https://www.amazon.com/Walker-40002-Exhaust-Tubing-Flex/dp/B000CQFQOM
Should be able to just screw it on like a garden hose when boondocking or whatever, then unscrew and stow when not needed.
Is anyone doing this already? Any opinions on if this is advisable?
I've considered the added backpressure that it will put on the engine, and if you go with a slightly larger tube, and keep the run below say 15', I
would imagine it would be negligible. Plan to monitor some exhaust/head temps with it uninstalled and installed to see how much it raises temps.
Would obviously also keep the tube out of leaf piles, etc. to prevent fires/heat damage to anything.
--
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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Jared & Stefanie Kohl
Rappahannock County, VA
1973 Painted Desert "Onslow"
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| Re: Remote Onan Exhaust - Extension [message #318298 is a reply to message #318297] |
Wed, 31 May 2017 23:57 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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The metal flexible exhaust is heavy and will not coil up into a very small space. Also, the moisture from the exhaust gets into all of the joints (actually one long joint) and the corrodes the metal a little each time and makes the pipe stick in the shape it's in when the water finally evaporates. It's ok for a strange bend in a fixed system, but unless it's stainless it won't last very long in that application either.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: Remote Onan Exhaust - Extension [message #318308 is a reply to message #318281] |
Thu, 01 June 2017 10:48 |
TR 1
Messages: 348
Registered: August 2015
Location: DFW
Karma: -7
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Only thing I'm concerned about with the silicone hose is the heat limit. Let me run the onan today and see what the temp at the exhaust outlet is. I'd imagine at high load, the temps may be higher than the silicone would tolerate.
Also agree, stainless would be a better alternative to the galvanized, but I'd imagine would cost quite a bit...
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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| Re: Remote Onan Exhaust - Extension [message #318316 is a reply to message #318311] |
Thu, 01 June 2017 12:02 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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One nice thing with the Genturi is the hot exhaust is mixed with outside air and the pipe temperature is greatly reduced. I have never use one.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Remote Onan Exhaust - Extension [message #318351 is a reply to message #318311] |
Thu, 01 June 2017 22:22 |
TR 1
Messages: 348
Registered: August 2015
Location: DFW
Karma: -7
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Matt Colie wrote on Thu, 01 June 2017 11:49Mark,
Have you looked up Gen-Turi?
One can be assembled for lest than the 100+ that they are sold for.
Matt
Thanks very much, Matt! No I had not heard of the Gen-Turi. Doesn't look like there's much to making one. I will definitely give this a shot.
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
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| Re: Remote Onan Exhaust - Extension [message #318388 is a reply to message #318361] |
Fri, 02 June 2017 23:31 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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EGTs are measured in the manifold, and they are plenty high there, that's why smart designers use cast iron if they can to construct air-cooled exhaust manifolds. A lot of heat is lost in the rest of the exhaust system.
Do not use exhaust hose for a permanent installation. It will hold up to the heat of full power exhaust from a V8 engine, but not continuously for a long period. It will hold up to the Onan running continuously until the end of days if you use a hose larger than the exhaust pipe that will allow extra air to enter. If you raise the output end it will draw air through just like the exhaust venturi. You don't seal the entrance end to the tailpipe.
If the exhaust was hot enough to damage that special hose, you would never be able to run the Onan while stationary, as it would melt the pavement or set the grass on fire.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] Remote Onan Exhaust - Extension [message #318530 is a reply to message #318316] |
Mon, 05 June 2017 14:03 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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On Jun 1, 2017, at 1:02 PM, Ken Burton wrote:
>
> One nice thing with the Genturi is the hot exhaust is mixed with outside air and the pipe temperature is greatly reduced. I have never use one.
The admixture of ambient air and exhaust definitely results in a cooler surface on the stack - but from a CO-poisioning perspective wouldn’t you want the stack gases to remain as hot as possible so as to be carried up and away from the coach to the greatest extent possible as they exit out the top? In cooler night conditions where there is little wind I can envision where they might come out the top and start heading back down to the ground as they are cooled by ambient air..
(Gen-turi or not, I keep two tested battery-powered CO detectors in the coach at all times for extra safety).
—Jim
Jim Miller
1977 Eleganza
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: Remote Onan Exhaust - Extension [message #318539 is a reply to message #318281] |
Mon, 05 June 2017 15:19 |
Tony Cook
Messages: 121
Registered: August 2014
Location: Torrance CA
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I grabbed a piece of scrap flexible electrical conduit from a job site I think its 1 1/2 about 5' long and slip it on the end of the tail pipe to divert from campers next to us and from blowing dirt all over. It works perfect and you can lay it up over the rear bumper if heat concerns. We are almost never on grass usually packed dirt so I just snake it on the ground to where ever is good. coil it up and stow. An added collar or venturi to help bring in secondary air to cool would be a plus just haven't done that yet as I only use for short times while bringing the batteries up .
Tony Cook
77' Kingsley ' SuperSession 77 '
Torrance Beach,CA
[Updated on: Mon, 05 June 2017 15:37] Report message to a moderator |
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| Re: [GMCnet] Remote Onan Exhaust - Extension [message #318540 is a reply to message #318530] |
Mon, 05 June 2017 15:14 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Jim,
I have to wonder which effect would dominate in the mixing of ambient air
with the CO: Temperature reduction or CO proportion reduction? And what
about the direction of the velocity vector, vertical vs horizontal?
One thing for sure: All the neighbors would appreciate it if I'd aim my
Troy-Bilt exhaust somewhere away from them! :-)
Since about the only time we fire it up is for lunch in a roadside
location, I haven't bothered to do anything beyond using two mufflers.
The detectors are unquestionably valuable in any case.
Ken H.
On Mon, Jun 5, 2017 at 3:03 PM, Jim Miller wrote:
> On Jun 1, 2017, at 1:02 PM, Ken Burton wrote:
>>
>> One nice thing with the Genturi is the hot exhaust is mixed with outside
> air and the pipe temperature is greatly reduced. I have never use one.
>
> The admixture of ambient air and exhaust definitely results in a cooler
> surface on the stack - but from a CO-poisioning perspective wouldn’t you
> want the stack gases to remain as hot as possible so as to be carried up
> and away from the coach to the greatest extent possible as they exit out
> the top? In cooler night conditions where there is little wind I can
> envision where they might come out the top and start heading back down to
> the ground as they are cooled by ambient air..
>
> (Gen-turi or not, I keep two tested battery-powered CO detectors in the
> coach at all times for extra safety).
>
> —Jim
>
> Jim Miller
> 1977 Eleganza
> 1977 Royale
> Hamilton, OH
>
>
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Remote Onan Exhaust - Extension [message #318543 is a reply to message #318539] |
Mon, 05 June 2017 15:26 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Tony,
Look in our Onan sectio for an Air Deflector to avoid steering dust under
your unit and expelling heat away from intake.
On Mon, Jun 5, 2017 at 1:19 PM, Tony Cook wrote:
> I grabbed a piece of scrap flexible electrical conduit from a job site I
> think its 1 1/2 about 5' long and slip it on the end of the tail pipe to
> divert from campers next to us and from blowing dirt all over. It works
> perfect and you can lay it up over the rear bumper if heat concerns. We are
> almost never on grass usually packed dirt so I just snake it on the ground
> to where ever is good. coil it up and stow. The added collar or venture to
> help bring in secondary air would be a plus just haven't done that yet as
> I only use for short times while bringing the batteries up .
> --
> Tony Cook
> 77' Kingsley ' SuperSession 77 '
> Torrance Beach,CA
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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Turbo rotaries especially run very hot. I see EGTs in the 1600 degree range on my 94. But I thought a piston engine under load would still see EGTs around 1200 degrees? Always assumed those silicon hoses were more for idle and emissions testing... Not for running extended periods under high load?
