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06-18-2025, 11:41 AM
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#1
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Junior Member
Join Date: Jun 2025
Posts: 3
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Cummins Onan Generator Exhaust
My generator exhaust got ripped off last trip. has anyone had success with custom exhaust that you connect while onsite?
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06-18-2025, 11:47 AM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 35,663
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RV make and model as well as gen set info ; will be a big help with getting you good replies .
Repairs to my Onan 7500 Quiet diesel on my 99 Newmar pusher ; might be a LOT different than what you require.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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06-18-2025, 12:20 PM
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#3
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Senior Member
Join Date: Nov 2005
Posts: 7,930
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Two different things--permanent OEM exhaust pipe attached to genset Vs temporary venturi-style exhaust pipe for diverting fumes up and away from neighbors? So which one are you asking about? OEM pipes are fairly generic but their installation my vary by RV manufacturer. Venturi vents pipes require the OEM pipe to be in place in order to attach to and use them.
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Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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06-18-2025, 12:33 PM
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#4
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Senior Member
Winnebago Owners Club
Join Date: Sep 2017
Posts: 461
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Not sure what you need, I would hold onto the damaged exhaust till you get it fixed. I have found it very hard and expensive to to totally replace one on my Winnebago Journey. Cummins custom made one for me the first time. I was able get it straightened and made round again the second time time.
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06-19-2025, 06:26 AM
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#5
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Junior Member
Join Date: Jun 2025
Posts: 3
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Onan RVQD 3200 on a class C. Would like to run pipe so I can disconnect when not using. The original piping hanging down 6 inches caused the problem
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06-19-2025, 06:52 AM
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#6
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Senior Member
Entegra Owners Club Spartan Chassis
Join Date: May 2023
Location: Cedar Rapids, IA
Posts: 2,423
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Quote:
Originally Posted by lwuu2000
Onan RVQD 3200 on a class C. Would like to run pipe so I can disconnect when not using. The original piping hanging down 6 inches caused the problem
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Doing that would prevent using the generator to run the coach AC while driving. Or maybe the correct way to put it, using the generator without the pipe to direct the exhaust out from under the coach would be unwise because CO emissions could build up inside the coach. A better option would be to have the pipe rerouted, so it is less exposed.
__________________
Dan, 2018 Thor ACE 30.3, 1996 Tiffin Allegro
2022 Entegra Aspire 44W, -- Spartan k2 chassis, -- 450 L9 Cummins
2020 Jeep Gladiator Rubicon
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06-19-2025, 07:56 AM
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#7
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Community Moderator
Join Date: Aug 2018
Location: Full timing
Posts: 8,864
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Quote:
Originally Posted by lwuu2000
My generator exhaust got ripped off last trip. has anyone had success with custom exhaust that you connect while onsite?
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I would find a little muffler shop and take the rig to them. Explain what happened and what you would done. They can make a pipe then you can install, or they may do it for you.
__________________
2018 Road Warrior 427
2013 Can Am Spyder RT Limited
2017 Ram 3500 w/Aisin w/4:10
2 Dachshunds DJ (RIP 9-12-19) & Joey (RIP 5-14-21)
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06-19-2025, 08:24 AM
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#8
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Senior Member
Join Date: Apr 2004
Posts: 4,115
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Correct. It's just an engine and an exhaust should be easy to fabricate by a good muffler shop. Of course, there must not be any leaks.
Different routing to achieve more ground clearance should be possible but you don't want the pipe to end under a window. Also, the end should be supported to allow a vertical venturi pipe (Genturi) to be attached when needed. Don't do what I did on a previous MH and have the new pipe exit under a cargo door so the Genturi, when installed, blocked the door 
Quote:
Originally Posted by hamm2018
I would find a little muffler shop and take the rig to them. Explain what happened and what you would done. They can make a pipe then you can install, or they may do it for you.
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__________________
George Schweikle Lexington, KY
2005 Safari (Monaco)Trek 28RB2, Workhorse W20, 8.1, Allison 1000 5 spd, UltraPower engine & tranny, Track bars & sway bars, KONI FSD, FMCA 190830, Safari Int'l. chapter. 1999 Safari Trek 2830, 1995 Safari Trek 2430, 1983 Winnebago Chieftain, 1976 Midas Mini
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06-19-2025, 08:31 AM
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#9
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Member
Join Date: Jun 2015
Location: Iowa
Posts: 84
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Did it damage the exhaust manifold. That would be a whole different issue?
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06-19-2025, 08:34 AM
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#10
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Senior Member
Join Date: Apr 2021
Location: Annapolis
Posts: 961
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Quote:
Originally Posted by George Schweikle
Different routing to achieve more ground clearance should be possible but you don't want the pipe to end under a window.
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This is exactly how Thor built the 2018 Freedom Elite - generator exhaust out the side beneath the slide under the bed area. Talk about stupid engineering. I relocated it out the back, no windows or slide seals there.
The only issue I had was the muffler shop didn't have the small pipe diameter, so the extension is a slightly larger diameter
__________________
2018 Thor Freedom Elite 24
on 2016 Sprinter Chassis
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06-19-2025, 08:49 AM
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#11
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Senior Member
Join Date: Apr 2024
Posts: 870
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If the muffler isn't damaged, & you still have the original tailpipe, have a muffler shop bend you a new pipe to reattach. Then raise it at the hanger most likely at the side of the coach.
__________________
Tony Ramirez
2019 BerkshireXL 40D 380HP, 1100W solar,920AHs LiFePO4
'04 37'Sunvoyager-SOLD, '92 30' Pinnacle-SOLD
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06-19-2025, 09:22 AM
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#12
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Senior Member
Join Date: Aug 2017
Posts: 2,380
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I had a mufler shop bend new pipe and I fabricated a new flange and welded it to the pipe so I could re route my exhaust out the back. I also installed heat shielding on top of the pipe.
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1993 Tiffin Allegro Bay 32'
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06-20-2025, 04:59 AM
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#13
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Junior Member
Join Date: Jun 2025
Posts: 3
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Exhaust system shop
Found an exhaust system shop that is going to fabricate piping that I can install onsite. I only run generator a half dozen times a year when I am boondocking in the summer. The A/C in the cab is strong enough to keep cool while driving. Thanks for all your replies
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06-21-2025, 06:41 AM
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#14
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Community Moderator
Join Date: Aug 2018
Location: Full timing
Posts: 8,864
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Quote:
Originally Posted by lwuu2000
Found an exhaust system shop that is going to fabricate piping that I can install onsite. I only run generator a half dozen times a year when I am boondocking in the summer. The A/C in the cab is strong enough to keep cool while driving. Thanks for all your replies
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Let us know how it goes.
__________________
2018 Road Warrior 427
2013 Can Am Spyder RT Limited
2017 Ram 3500 w/Aisin w/4:10
2 Dachshunds DJ (RIP 9-12-19) & Joey (RIP 5-14-21)
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