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Diverting generator exhaust

Yahoo Message Number: 62768
We have come upon enough situations where the exhaust from our Onan generator bothers others - especially while tailgating - and are interested in purchasing a pipe to send the fumes up above the coach.
I searched this group and it seems many use the Gen-turi system. However, the generator (2009 Magna/Onan 12500) exhaust pipe has a 2-inch opening and even if we ordered the largest adapter it would not fit. Plus, the Onan website states "using an extension pipe may void your warranty".

What's a girl to do? Please advise.

Thank you,
Terry Taylor
2009 Magna #7034

http://www.rvgoddess.com/www.rvgoddess.com

Re: Diverting generator exhaust

Reply #2 –
Yahoo Message Number: 62770
Ha. We have all that already, of course. That solar panel isn't much help at Autzen Stadium in December.

Re: Diverting generator exhaust

Reply #3 –
Yahoo Message Number: 62773
Add more panels, lots more panels. OR, stick a hose on it and place under the out-of-town teams coach and tell them they stink, especially if it is civil war weekend. ha ha. OR, go to Knetchs and look at there exhaust pipe adapters. Most likely you can find what you need to make the stand pipe work. We have one and I do not understand why it would cause any back pressure on your gen. It is just an 90 degree elbow that opens into a large plastic pipe. I doubt you are running the gen. full bore at the games. We have used it on our Power Tech diesel and a previous gas gen, with no problems. Another option, purchase a little Honda 2000i and let it charge your batteries and use the inverter for more power. The Honda is very quite and very little exhaust. Just be sure and lock it down. Honda's 3000 is also very quite. Two Honda 2000i tied together produce more power then a single 3000. The Honda's burn very clean with very little exhaust smell. The cheapest is probably the stand pipe, especially if you catch it on sale at Camping World. Do you get there sale emails? Usually comes on sale this time of year for the very reason you mention.

Go Ducks. Going to be a very interesting year. We are in the Eugene area, if you couldn't tell.

Leonard Kerns
97' Magna 5418

Re: Diverting generator exhaust

Reply #4 –
Yahoo Message Number: 62779
If you go with the stand pipe, get suctions cup holders to attach it to the side of your RV. Do not have to drill holes and mount the clips this way and is moveable to other units. Remove the suction cups and no damage.

Re: Diverting generator exhaust

Reply #5 –
Yahoo Message Number: 62796
I diverted both Webasrto heater and generator exhaust by buying 3" twin wall exhaust pipe at Lowes. Had local muffler shop bend and make a short adapter to go from bus pipes to the vertical twini wall ppipe. Looked at how the commercials plastic one is made as to the venture action and copied the concept. Then I have suction cups to hold to side of bus. this twin wall is what is used for small home gas heater exhaust.

Bill n barb, cc prevost 1998 40' xl. #60365

Re: Diverting generator exhaust

Reply #6 –
Yahoo Message Number: 62797
Terry,

Camping World sells an extension to the exhaust pipe on the generator which attaches to the side of your coach, The only attachments to the coach are two small adhesive ovals which hold the extension in place. The extension is only used when tailgating. I think it is less than $100.

Martin

2006 Affinity #6543

Re: Diverting generator exhaust

Reply #8 –
Yahoo Message Number: 62806
Gonna use a page from your book and make my own Bill...
What is the purpose of the venturi?? Wouldn't it be better for the engine to have a straight pipe with no restriction???
And how about a "flapper" on top of the stack to keep out the rain when the genset is not running???

Buck

k7wn, '99Magna5653

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Re: Diverting generator exhaust

Reply #9 –
Yahoo Message Number: 62829

A venturi can dramatically speed the flow of the exhaust gasses. It's how carburetors work allowing the fuel in fuel bowl to be "sucked" up and out into the air flow where it i mixed.
This is probably the generator manufacturer siad this void a warranty. If it causes changes to fuel dynamics leanng out the mixture overheating or other problems can be caused.
I personally don't think this is a big issue for a generator engine but it could.

Google "venturi" and you'll find lots of info and applications.

Bob (rthandren@...)
'05 Inspire 51178

Re: Diverting generator exhaust

Reply #10 –
Yahoo Message Number: 62832
You do NOT want a straight pipe! It will get VERY hot and somebody could easily burn themselves. The venturi sucks in air with the exhaust, cooling it and allowing plastic to be used.

Al Colby

2000 Intrigue 10979

Re: Diverting generator exhaust

Reply #11 –
Yahoo Message Number: 62839
The venturi action sucks in air to help cool the exhaust gas as it goes into the insulated pipe. The fittment from the adapter pipe you need to make at a muffler bending shop will slip into the 3" vertical double stack with some space around it. This is what creates the venturi action. That is how the one is designed that you purchase at retail camping stores. With the opening where the adapter pipe from the muffler extension goes into the vertical of your insulated 3" metal pipe, there is an opening caused by and for the venturi. Therefore water will not drain back into the short exhaust pipe adapter if its raining. I got my 6" suction pads over the internet. I use 3 of them on each of the pioes: generator and Webasto. I then use those small stretchy cords with the big black ball on the end to attach the vertical pipe to the handles on the rubber suction pads. The hardest job was to find the rubber suction pads on the internet. I forgot what I finally located them under: automotive glass suction cups or something.
I was just going to use the Camping World model, but it will not handle the exhaust temps from the Webasto so since I had to make one, I made two. Both the same but the adapter pipe from the end of the genset adn Webasto are different sizes and in different bent configurations. I experimented myself with hi-temp 3" plastic pipe and the Webasto heat is much higher and the vertical pipe just got soft and bent so it was back to the drawing boards. My biggest challenge was finding space to carry these. So I made a metal framework and they are carried in the bay alongside the generator. Its all metal and there was plenty of room. THe suction pads are not in the same area though.

bill n barb, poconosof pa, 1998 prevost cc 40' xl

Re: Diverting generator exhaust

Reply #12 –
Yahoo Message Number: 62840
Thanks for the detailed info Bill!

Buck

k7wn, '99Magna5653

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Re: Diverting generator exhaust

Reply #13 –
Yahoo Message Number: 62842
Get the Gen-Turi system, take the adapter to a local muffler shop and have them fabricate one larger to fit your pipe. I would not worry about the warranty. These generators have enough built-in fault protection that would shut down before any damage is done.
I've been using the Gen-Turi system for nine years with my Onan and it works great. I also had to modify the adapter to fit the larger exhaust pipe.

Rob

2002 Intrigue #11480

Re: Diverting generator exhaust

Reply #14 –
Yahoo Message Number: 62871
Hi Fellow Owners, Having worked for Cat all my life and a few years on Cat/Power Tech. R.V. Generators, This Problem never came up? There is a Warranty Law out there to protect us on aftermarket changes. I would run this by Onan as a E-Mail. I will be on the sidelines on this one! Country Coach as far as my old 7kw PT. uses oversized Muffler and Exhaust Piping. I use to Approve Cat generator installals for a living. Trust me We have a great product! On my old Gas onan I used the Camping World type Camco Genturi and Liked it and used it for years! Remember everyone is afraid of being sued today! Good luck on this one! Ken Cat retired Tech. 99 Allure 30356 and a happy camper!