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Old 09-20-2019, 07:06 PM   #1
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THOR #13701
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.Click image for larger version

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Old 09-20-2019, 07:25 PM   #2
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THOR #8860
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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Old 09-20-2019, 09:03 PM   #3
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THOR #908
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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Old 09-20-2019, 09:24 PM   #4
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THOR #13932
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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Old 09-20-2019, 10:11 PM   #5
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THOR #8860
MIne hangs about two and a half inches below the bodywork...
http://www.thorforums.com/forums/att...1&d=1569017475


http://www.thorforums.com/forums/att...1&d=1569017475

http://www.thorforums.com/forums/att...1&d=1569017475
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Old 09-21-2019, 01:10 AM   #6
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THOR #908
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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Old 09-21-2019, 11:42 AM   #7
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THOR #11130
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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Old 09-25-2019, 05:44 AM   #8
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THOR #13701
Quote:
Originally Posted by ducksface View Post
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?
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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Old 09-25-2019, 05:47 AM   #9
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THOR #15943
I always wondered why they don't just plumb it into the main tailpipe?
GVP
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Old 09-25-2019, 11:16 AM   #10
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Originally Posted by GVP-The Boxcar Children View Post
I always wondered why they don't just plumb it into the main tailpipe?
GVP
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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Old 09-25-2019, 11:52 AM   #11
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THOR #8860
If they plugged it in upstream from the catalytic converter: it could cause some really big problems...
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Old 09-25-2019, 12:23 PM   #12
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THOR #1469
Quote:
Originally Posted by GVP-The Boxcar Children View Post
I always wondered why they don't just plumb it into the main tailpipe?
GVP
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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Old 09-25-2019, 12:33 PM   #13
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THOR #11130
Quote:
Originally Posted by dstankov View Post
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.

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.
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Old 09-25-2019, 12:36 PM   #14
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THOR #8860
I guess that they take their exhaust systems more seriously than does the typical Harley-Davidson dealership...
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Old 09-25-2019, 12:39 PM   #15
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THOR #11130
Most important consideration...modifications void warranties.
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Old 09-25-2019, 12:54 PM   #16
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Quote:
Originally Posted by The Gritz Carlton View Post
Most important consideration...modifications void warranties.
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!"
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