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| [GMCnet] roof genset exhaust [message #162618] |
Sat, 10 March 2012 19:29  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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I usually have electrics at the shows I take the GMC to, so the Generac genset doesn't bother me much - unreliable though it seems to be. But, I signed for one the other day, and the RV listing says self - contained and generators must have an exhaust above the roofline. I priced the commercial ones, and put one together out of PVC pipe and fittings. It seems to work quite well. I took photos of it, and tried to upload them to the GMC photo site. I gave it up after an hour of watching, waiting, and no action. It managed to produce ten thumbnails from 14 pictures, but posted none to the album.
If anybody knows how to make the upload software work, I'll send you the pics and you upload them. Meantime, if your generator exhausts under the rear of the coach, it's fairly easy to make a PVC venturi setup which will take the exhaust up as high as you like. It sits and clips, no need to punch holes in anything. Comes apart into two pieces of pipe - one four inch with fittings and one two inch which slips inside the four inch, which you can bungee to the roof rail or side awning cannister for travelling.
--johnny
'76 23' transmode Norris
'76 palm beach
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] roof genset exhaust [message #162633 is a reply to message #162618] |
Sat, 10 March 2012 21:21  |
Dennis S
Messages: 3046
Registered: November 2005
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Johnny,
Just a note of caution to anyone using a pvc genturi system -- at the Memphis FMCA rally one attendee had the stack overheat, melt and bend over, causing a potentially dangerous situation. They were sleeping in the coach when it was discovered by a passerby.
Dennis
| Johnny Bridges wrote on Sat, 10 March 2012 19:29 |
I usually have electrics at the shows I take the GMC to, so the Generac genset doesn't bother me much - unreliable though it seems to be. But, I signed for one the other day, and the RV listing says self - contained and generators must have an exhaust above the roofline. I priced the commercial ones, and put one together out of PVC pipe and fittings. It seems to work quite well. I took photos of it, and tried to upload them to the GMC photo site. I gave it up after an hour of watching, waiting, and no action. It managed to produce ten thumbnails from 14 pictures, but posted none to the album.
If anybody knows how to make the upload software work, I'll send you the pics and you upload them. Meantime, if your generator exhausts under the rear of the coach, it's fairly easy to make a PVC venturi setup which will take the exhaust up as high as you like. It sits and clips, no need to punch holes in anything. Comes apart into two pieces of pipe - one four inch with fittings and one two inch which slips inside the four inch, which you can bungee to the roof rail or side awning cannister for travelling.
--johnny
'76 23' transmode Norris
'76 palm beach
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] roof genset exhaust [message #162653 is a reply to message #162633] |
Sun, 11 March 2012 10:33 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Yeah. I think the answer is lots of outside air coming in. I ran it a couple of hours loaded with the airconditioner and the pipe never got past warm to the touch. In that this opne is supported from the top, it won't bend over anyway. It's like the most efficient set for the LP fridge: The pipe wants to be plumb and the exhaust wants to enter straight up in the center. This is 4 inch pipe. I've seen 3 and even 2 used this way, I wouldn't though.
In addition to the venturi around the exhaust, the ell which supports it on the bumper is open. I had considered plugging it, but when I tested it, it is pulling in enough air to snuff a candle brought close to the opening.
--johnny
________________________________
From: Dennis Sexton <dennisfsexton@aol.com>
To: gmclist@temp.gmcnet.org
Sent: Saturday, March 10, 2012 10:21 PM
Subject: Re: [GMCnet] roof genset exhaust
Johnny,
Just a note of caution to anyone using a pvc genturi system -- at the Memphis FMCA rally one attendee had the stack overheat, melt and bend over, causing a potentially dangerous situation. They were sleeping in the coach when it was discovered by a passerby.
Dennis
Johnny Bridges wrote on Sat, 10 March 2012 19:29
> I usually have electrics at the shows I take the GMC to, so the Generac genset doesn't bother me much - unreliable though it seems to be. But, I signed for one the other day, and the RV listing says self - contained and generators must have an exhaust above the roofline. I priced the commercial ones, and put one together out of PVC pipe and fittings. It seems to work quite well. I took photos of it, and tried to upload them to the GMC photo site. I gave it up after an hour of watching, waiting, and no action. It managed to produce ten thumbnails from 14 pictures, but posted none to the album.
>
> If anybody knows how to make the upload software work, I'll send you the pics and you upload them. Meantime, if your generator exhausts under the rear of the coach, it's fairly easy to make a PVC venturi setup which will take the exhaust up as high as you like. It sits and clips, no need to punch holes in anything. Comes apart into two pieces of pipe - one four inch with fittings and one two inch which slips inside the four inch, which you can bungee to the roof rail or side awning cannister for travelling.
>
> --johnny
> '76 23' transmode Norris
> '76 palm beach
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Dennis S
73 Painted Desert 230
Germantown, TN
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] roof genset exhaust [message #162654 is a reply to message #162618] |
Sun, 11 March 2012 11:09 |
rssbob
Messages: 259
Registered: January 2004
Location: La Mesa, Ca. (San Diego a...
Karma: 0
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Johnny, If you send me your photos, I will post them for you.
rssbob@cox.net
On Mar 10, 2012, at 5:29 PM, Johnny Bridges wrote:
> I usually have electrics at the shows I take the GMC to, so the Generac genset doesn't bother me much - unreliable though it seems to be. But, I signed for one the other day, and the RV listing says self - contained and generators must have an exhaust above the roofline. I priced the commercial ones, and put one together out of PVC pipe and fittings. It seems to work quite well. I took photos of it, and tried to upload them to the GMC photo site. I gave it up after an hour of watching, waiting, and no action. It managed to produce ten thumbnails from 14 pictures, but posted none to the album.
>
> If anybody knows how to make the upload software work, I'll send you the pics and you upload them. Meantime, if your generator exhausts under the rear of the coach, it's fairly easy to make a PVC venturi setup which will take the exhaust up as high as you like. It sits and clips, no need to punch holes in anything. Comes apart into two pieces of pipe - one four inch with fittings and one two inch which slips inside the four inch, which you can bungee to the roof rail or side awning cannister for travelling.
>
> --johnny
> '76 23' transmode Norris
> '76 palm beach
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Bob Sobrito
78 Palm Beach
La Mesa, Ca
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| Re: [GMCnet] roof genset exhaust [message #162734 is a reply to message #162653] |
Mon, 12 March 2012 10:03 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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| Johnny Bridges wrote on Sun, 11 March 2012 10:33 |
Yeah. I think the answer is lots of outside air coming in. I ran it a couple of hours loaded with the airconditioner and the pipe never got past warm to the touch. In that this opne is supported from the top, it won't bend over anyway. It's like the most efficient set for the LP fridge: The pipe wants to be plumb and the exhaust wants to enter straight up in the center. This is 4 inch pipe. I've seen 3 and even 2 used this way, I wouldn't though.
In addition to the venturi around the exhaust, the ell which supports it on the bumper is open. I had considered plugging it, but when I tested it, it is pulling in enough air to snuff a candle brought close to the opening.
--johnny
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Why use pvc and not metal pipe?
like a heat duct or something?
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] roof genset exhaust [message #162780 is a reply to message #162734] |
Mon, 12 March 2012 18:57 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Why use PVC?
1. It's cheaper (I had most of it on hand)
2. It's quieter.
3. It's easier to work with.
4. If you try, you can get loopy on the cement.
It would work quite well done in flue pipe, and I expect it would be a bit lighter. You'd need to get the support arm screwed into the upper fitting so it wouldn't skip out - the PVC is a press fit there. It wants to come apart there so it knocks down into essentially a one - dimension piece for easy storage both atop the coach and in the garage.
--johnny
'76 23' trandmode norris
'76 palm beach
________________________________
From: Keith V <my427v8@hotmail.com>
To: gmclist@temp.gmcnet.org
Sent: Monday, March 12, 2012 11:03 AM
Subject: Re: [GMCnet] roof genset exhaust
Johnny Bridges wrote on Sun, 11 March 2012 10:33
> Yeah. I think the answer is lots of outside air coming in. I ran it a couple of hours loaded with the airconditioner and the pipe never got past warm to the touch. In that this opne is supported from the top, it won't bend over anyway. It's like the most efficient set for the LP fridge: The pipe wants to be plumb and the exhaust wants to enter straight up in the center. This is 4 inch pipe. I've seen 3 and even 2 used this way, I wouldn't though.
> In addition to the venturi around the exhaust, the ell which supports it on the bumper is open. I had considered plugging it, but when I tested it, it is pulling in enough air to snuff a candle brought close to the opening.
>
> --johnny
Why use pvc and not metal pipe?
like a heat duct or something?
--
Keith
69 Vette
29 Dodge
75 Royale GMC
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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