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Making a vertical exhaust out of your Generator

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ilbe...@gmail.com

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Jul 18, 2009, 10:47:39 AM7/18/09
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Ive just completed making my own vertical exhaust for a 4.0 Onan
Generator , which termintates about 12" above the roofline. Ive seen
the one offered in Camping World and thought I could make something
effective for a fraction of the cost. Theres is a thin metal one ,
but i elected to make mine out of schedule 40 1.25" dia. PVC as even
after 2 hours of Generator operation, I can hold my hand on the
exhaust gases AND exhaust tip...thus i figure it is roughly 110 f.
max. (PVC is rated at 140 f. max) . Ive made my system into three-
4' lengths incl. (glued) fittings that simply push together. , sliding
the inlet of the PVC pipe onto the existing 3" of the Generators
exhaust tip . I use a fixed clamp at the top of the RV for the PVC
pipe to push thru to hold it into place. The Piping comes out from
the side by about 1" so it does not vibrate against the side of the
RV. I drilled a 1/4" hole on the very bottom of the first inlet PVC
elbow to allow collected condensate to drain out . The inlet PVC Pipe
that pushes over the exhaust tip is secured with a long Pin that
pertrudes thru the center of the PVC Pipe and Generator exhaust tip.
I ran the Generator for a good while and it seemed to function great
without it getting hot . It is somewhat quieter too and no exhaust
smell is detected .

Have you done anything simular ?
Any tips/concerns you wish to make ?

Thanks for your valued input.

Larry

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Jul 19, 2009, 12:03:42 AM7/19/09
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"IlBe...@gmail.com" <ilbe...@gmail.com> wrote in message
news:b84dee8c-a0bc-4307...@32g2000yqj.googlegroups.com...

I think carbon monoxide is heaver than air and I would be very careful of it
re entering the RV. I would lay the pipe on the ground downwind of the RV. I
may be wrong about it being heavy but I would still lay the pipe on the
ground or not use it at all. I like to be more safe than dead.
Larry

Nick Cramer

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Jul 19, 2009, 1:41:23 AM7/19/09
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"Larry" <ss...@ymail.com> wrote:
> "IlBe...@gmail.com" <ilbe...@gmail.com> wrote in message

> > Ive just completed making my own vertical exhaust for a 4.0 Onan

CO is slightly lighter than air at NTP. The mixture of CO, CO2 and H2O
vapor is carried upward by thermal convection (chimney draw). Ilbebauck's
solution seems like a good one IMNSHO.

--
Nick, KI6VAV. Support severely wounded and disabled Veterans and their
families: https://www.woundedwarriorproject.org/ Thank a Veteran!
Support Our Troops: http://anymarine.com/ You are not forgotten.
Thanks ! ! ~Semper Fi~ USMC 1365061

ilbe...@gmail.com

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Jul 19, 2009, 9:35:22 AM7/19/09
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On Jul 18, 11:03 pm, "Larry" <ss...@ymail.com> wrote:
> "IlBeBa...@gmail.com" <ilbeba...@gmail.com> wrote in message
> Larry- Hide quoted text -
>
> - Show quoted text -

Camping World offers it to the public :
http://www.campingworld.com/shopping/item/gen-turi-generator-exhaust-system/14041

Don Bradner

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Jul 19, 2009, 10:59:20 PM7/19/09
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When you said you have "seen" the one sold by Camping World I'm
guessing you mean "seen" as in you've seen the ads? I say that because
it is not metal, except where it connects to the generator exhaust. I
think it is ABS plastic - used to have one, but left it with the old
coach because a through-the-roof generator exhaust is standard on a
Blue Bird.

The unique thing about the commerical one is the venturi, which is why
it is called Gen-Turi. At the bottom the small pipe is connected to
the large pipe by straps rather than a sealed connection. This causes
a large amount of air to be sucked in along with the exhaust, making a
much cooler mixture in the pipe. I can't say whether you need that or
not, but it is not a bad idea. Your exhaust may be 110 now, but what
do you think it will be when the air temp is 110?

You can find some good pictures of a homemade one with venturi here:
http://barthmobile.com/groupee/forums/a/tpc/f/3631087061/m/8381039061

Don Bradner
www.arcatapet.net
'90 Wanderlodge PT40 "Blue Thunder" towing '07 Jeep Liberty
Posting today by Satellite from
Yellowstone National Park

The Tagge's

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Jul 20, 2009, 7:46:42 AM7/20/09
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I tried that with my old Winny, but the exhaust temp was far too high for
plastic. Maybe with the venturi addition that would work.
"IlBe...@gmail.com" <ilbe...@gmail.com> wrote in message
news:b84dee8c-a0bc-4307...@32g2000yqj.googlegroups.com...

ilbe...@gmail.com

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Jul 20, 2009, 9:13:46 AM7/20/09
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On Jul 19, 9:59 pm, Don Bradner <d...@arcatapet.com> wrote:
> On Sat, 18 Jul 2009 07:47:39 -0700 (PDT), "IlBeBa...@gmail.com"
> Yellowstone National Park- Hide quoted text -

>
> - Show quoted text -

Ive seen the Gen-Turi on RV's is what i meant, and, ive seen the ad.
The way i made my vertical exhaust, was to go with a slightly larger
inlet that pushes OVER the present Generators tip , which will induce
air mixed in with the exhaust gas flow thereby keeping the exhaust gas
cool . I did my experiment at an outdoor temp of about 80 f.
Theres nowhere I RV where the outside temp. is 110 f. I dont go
RVing in anything much over 90 f.

ilbe...@gmail.com

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Jul 20, 2009, 9:19:47 AM7/20/09
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On Jul 20, 6:46 am, "The Tagge's" <mtag...@cox.net> wrote:
> I tried that with my old Winny, but the exhaust temp was far too high for
> plastic.  Maybe with the venturi addition that would work."IlBeBa...@gmail.com" <ilbeba...@gmail.com> wrote in message
> > Thanks for your valued input.- Hide quoted text -

>
> - Show quoted text -

Thanks Don for the site. I actually considered using Electrical
Condut and fittings for mine, except, the exhaust from my Generator
is not really that hot and well within the limits of PVC pipe. Plus,
its much lighter than 1.25" Metal Conduit. I do get a venturi
effect from just having a larger diameter inlet pipe pushed over the
Generators exhaust tip as air is sucked in around the circumferance.
But the Guy in the site did a nice job. By the way, my total cost was
$ 12.

ilbe...@gmail.com

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Jul 30, 2009, 12:58:59 PM7/30/09
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> Thanks Don for the site.  I actually considered using Electricaltin

> Condut and fittings for mine, except,  the exhaust from my Generator
>schewitis not really that hot and well within the limits of PVC pipe. Plus,

> its much lighter than 1.25"  Metal Conduit.   I do get a venturi
> effect from just having a larger diameter inlet pipe pushed over the
> Generators exhaust tip as air is sucked in around the circumferance.
> But the Guy in the site did a nice job.  By the way, my total cost was
> $ 12.- Hide quoted text -

>
> - Show quoted text -

UPDATE : The PVC Exhaust Pipe setup melted finally !!!! Ive
therefore switched over to using 1.25" Conduit with galvanized Pipe
fittings for the system. Do NOT use PVC . It just took an extended
run time to finally melt it rendering it useless.

ken

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Jul 30, 2009, 10:23:57 PM7/30/09
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On Jul 30, 9:58 am, "IlBeBa...@gmail.com" <ilbeba...@gmail.com> wrote:

> UPDATE :  The PVC Exhaust Pipe setup melted finally !!!!   Ive
> therefore switched over to using 1.25"  Conduit with galvanized Pipe
> fittings for the system.  Do NOT use PVC . It just took an extended

> run time to finally melt it rendering it useless.- Hide quoted text -


>
> - Show quoted text -

Well DUH!
Too bad it didn't catch on fire too, ya Dumbass

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