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09-20-2019, 07:06 PM
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#1
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Member
Brand: Thor Motor Coach
Model: Four Winds 30D
State: New Jersey
Posts: 37
THOR #13701
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Class C Generator Exhaust re-routing?
Hi there, I have a 30' Class C, and have my Gene exhaust pipe drag on some pavement/driveways (including my own). I would like to see if I can re-route it so it doesnt sit 5-6 inches below the frame and sidewall.
I have a Thor Four Winds 30D with the onboard ONAN Generator mounted on the front drivers side cabinet. This mounting location has the exhaust right in the middle of the wheelbase, making it the lowest point when going over a "hump". The Exhaust for the Gene drops straight down, turns parallel and routes below the frame towards front and out the side right behind the Drivers door. I've had to create a ramp just to try and drive in and out of my driveway so it doesnt drag.
- Has anyone re-routed their exhaust on their Class C for similar purposes/reasons?
- Has anyone routed their Exhaust THROUGH their coach wall (like on a boat)?
- Has anyone redirected their exhaust instead of straight down FROM the generator - through a new hole in the Generator frame so it comes out sideways?
Here is a picture or 2 of what I'm looking at.
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09-20-2019, 07:25 PM
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#2
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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It looks to me as if you could take up some "slack" out of that last hanger, and raise it up a little bit...
If you could put a 45 degree angle downturn on the end of it:
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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09-20-2019, 09:03 PM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: 2013 31L
State: Florida
Posts: 2,184
THOR #908
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mine is exactly the same, except I added a resonator to the forward span.
The pipe is necessarily long and passes too close to the fuel line, fuel pump, and filter for my liking.
In mine anyway, the more logical design from the genny's perspective I think would be to shorten the pipe by just coming straight out instead of going forward first....
but
that would put it more under the living room slide
going rearward and coming out the back would be good in a way, but that would be very much longer
so I don't think there's any way to go that's much better
anyway, in several years I don't think I've ever dragged mine yet....
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09-20-2019, 09:24 PM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 6,900
THOR #13932
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I'm looking at your running board/house connection on the rearward side of the cab.
I'd bring it through the filler panel between the cab and running board, along the house body and be done..
You'll never step on it and you'll never drag it.
One hole drilled through that filler piece, and 50 bucks at the muffler shop.
For the little money a muffler shop charges I doubt I'd do this myself.
And really consider just bringing it straight out. What are the chances of running the generator with the slide out, and whats the cost of one of the generator snorkel things if it does become a problem when the slide is out?
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09-20-2019, 10:11 PM
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#5
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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09-21-2019, 01:10 AM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: 2013 31L
State: Florida
Posts: 2,184
THOR #908
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the problems I see with bringing it straight out instead of forward...under the slide
the bottom side of the slide is not sealed, not even close, so I'd imagine it would increase the odds of leaking a bit
and
the other thing....now that I'm thinking of it isn't such a huge problem as I'd originally thought when I considered it a few years ago...is that the pipe would be under the slide so the genturi wouldn't work, if you chose to try one.... except that maybe it wouldn't be so hard to just add a straight extension out to the outside when using it
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09-21-2019, 11:42 AM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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This would require custom work and a bit of welding but...shorten the distance between where it come from the bottom of the generator (manifold) and the first bend. From the pictures, this would bring the entire assembly up a couple inches and keep the existing profile. It looks like you have clearance to raise it a tad this way as long as the running board is forward of the pipe.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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09-25-2019, 05:44 AM
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#8
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Member
Brand: Thor Motor Coach
Model: Four Winds 30D
State: New Jersey
Posts: 37
THOR #13701
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Quote:
Originally Posted by ducksface
I'm looking at your running board/house connection on the rearward side of the cab.
I'd bring it through the filler panel between the cab and running board, along the house body and be done..
You'll never step on it and you'll never drag it.
One hole drilled through that filler piece, and 50 bucks at the muffler shop.
For the little money a muffler shop charges I doubt I'd do this myself.
And really consider just bringing it straight out. What are the chances of running the generator with the slide out, and whats the cost of one of the generator snorkel things if it does become a problem when the slide is out?
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Agreed, not quite liking the bring it straight out the side, 1. it would be UNDER the slide (which would undoubtedly draw fumes into the coach). 2. it doesnt really solve my problem as the exhaust drops straight down from the Gene and going straight out the side would mean the whole exhaust would drag as the midpoint of the wheelspan.
Thanks for your thoughts.
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09-25-2019, 05:47 AM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: 2019 Aria 4000
State: Utah
Posts: 336
THOR #15943
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I always wondered why they don't just plumb it into the main tailpipe?
GVP
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09-25-2019, 11:16 AM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: 2013 31L
State: Florida
Posts: 2,184
THOR #908
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Quote:
Originally Posted by GVP-The Boxcar Children
I always wondered why they don't just plumb it into the main tailpipe?
GVP
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I've considered the same thing...
but in my case it would put it in the area near and under my awning where you might be sitting while running the genny.
and probably more importantly, there could be dynamic considerations beyond any engineering capability that they're be willing to explore, regarding the pressures competing from the V-10 against the 1-banger generator.
My wish list would be to plumb it either inside the wall....or up the rear wall of the coach someplace...going up past the roof.... think a permanently installed factory genturi hidden and nicely done.
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09-25-2019, 11:52 AM
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#11
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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If they plugged it in upstream from the catalytic converter: it could cause some really big problems...
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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09-25-2019, 12:23 PM
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#12
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Site Team
Brand: Entegra
Model: Accolade 37TS
State: South Dakota
Posts: 8,767
THOR #1469
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Quote:
Originally Posted by GVP-The Boxcar Children
I always wondered why they don't just plumb it into the main tailpipe?
GVP
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Because the Onan Installation Procedures specifically says don't do it.
"9. Do not interconnect generator set and vehicle exhaust systems."
It is interesting what one learns when they take the time to read the manual and do some research. Tailpipe Installation (Section 4.1) takes up about 4 pages of the manual.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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09-25-2019, 12:33 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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Quote:
Originally Posted by dstankov
Because the Onan Installation Procedures specifically says don't do it.
"9. Do not interconnect generator set and vehicle exhaust systems."
It is interesting what one learns when they take the time to read the manual and do some research. Tailpipe Installation (Section 4.1) takes up about 4 pages of the manual.
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When I had mine serviced at Cummins/Onan in Atlanta, the guy told me every single MH installation has to be approved by them before installation. Back pressure, exhaust direction relevance to windows, slides and sleeping spaces must be approved by them. Re routing is a serious thing and your plan should be run by them for review..even simply extending the pipe. Your life could depend on it.
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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09-25-2019, 12:36 PM
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#14
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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I guess that they take their exhaust systems more seriously than does the typical Harley-Davidson dealership...
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"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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09-25-2019, 12:39 PM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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Most important consideration...modifications void warranties.
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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09-25-2019, 12:54 PM
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#16
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Quote:
Originally Posted by The Gritz Carlton
Most important consideration...modifications void warranties.
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So the answer to that problem is to just never make a modification that you can't put back to stock... when the whole project goes, "Boom!"
__________________
"What: me worry?"
Good Sam Member 843599689
Current coach: Tiffin Wayfarer 24 BW
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05-19-2023, 11:08 AM
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#17
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Senior Member
Brand: Thor Motor Coach
Model: Chatea 31E
State: Maryland
Posts: 455
THOR #5837
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I need that exact tailpipe. Anyone know where I can get one? All of the Onan exhaust kits I see have the tailpipe just go straight out the side, not forward and then out the side like this one. Mine rusted and came loose where it connects to the gen muffler, and it dragged on the ground, so I need to replace it.
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05-19-2023, 06:25 PM
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#18
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Senior Member
Brand: Thor Motor Coach
Model: 2013 31L
State: Florida
Posts: 2,184
THOR #908
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I'd try muffler shops. They may not have the same size pipe though...Wehn I added my resonator teh shop I took it to welded it for me but if I recall correctly they didn't have jigs and pipe that size. Still you'd probably be able to find someone to make one up....
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06-12-2023, 01:08 PM
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#19
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Senior Member
Brand: Thor Motor Coach
Model: Chatea 31E
State: Maryland
Posts: 455
THOR #5837
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As an update, I got a new generator tailpipe from Thor.
I tried a local Thor dealer, and their parts folks said that I had to buy a kit that cost over $500 and had various pieces that had to be welded together.
Then I tried some muffler shops and nobody could bend pipe that size. I finally found one that said that if I brought in the pipe they had a guy who could bend it.
I called Thor customer service and got put on hold forever. It said leave a message and they will call back, but they never did.
Finally, I called and just waited until someone answered. They were able to order the part, which cost around $80 with shipping.
The replacement pipe isn't mandrel bent like the original, but I installed it and it's fine.
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