Home » Public Forums » GMCnet » Fender Vents
| Fender Vents [message #109188] |
Mon, 20 December 2010 19:18  |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
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I installed my fender vents in the GMC today jimk sold me a mth back. Has anyone noticed a difference in compartment temps with them installed?
It was easy to do, and they look nice as well.
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
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| Re: Fender Vents [message #109197 is a reply to message #109188] |
Mon, 20 December 2010 20:29  |
RadioActiveGMC
Messages: 1020
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Location: Hot AZ desert
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Thats good news. It just got dark after I installed them so I haven't gotten to even start the engine yet. I kinda wondered when I put back in the wheel well if that will restrict the flow to them, but something has got to be better then nothing.
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
[Updated on: Mon, 20 December 2010 20:30] Report message to a moderator |
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| Re: [GMCnet] Fender Vents [message #109203 is a reply to message #109192] |
Mon, 20 December 2010 20:46 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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We took some measurement and noticed that the velocity out of the
small ones were considerable higher compared to our larger one.I never
kept the record as it was at idle and not at wothwhile speeds.
More air that can escape from the top region, thebetter cooling can be achieved.
the vent allows more air to pass through the radiator as there is less
back pressure at the uppernarea which has no venting.
On Mon, Dec 20, 2010 at 5:38 PM, Larry Davick <ljdavick@comcast.net> wrote:
> No idea about engine room temperature, but when walking by at the gas station I feel a lot of heat coming out of my vents. Gotta help!
>
> Larry Davick
> Fremont, California
> The Mystery Machine
> '76 (ish) Palm Beach
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Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Fender Vents [message #109209 is a reply to message #109188] |
Mon, 20 December 2010 21:02 |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
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I've got two camping trips coming up in the next two weeks. So can't wait to see!
They look nice and were fast to install. I'm hoping to get more air flow as AZ can be brutal. This time of year isn't so bad. I'm keeping my trips short about 125 miles or so for now. Slowly but surely we'll venture off into more and more distance!
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
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| Re: Fender Vents [message #109239 is a reply to message #109188] |
Tue, 21 December 2010 06:38 |
Luvn737s
Messages: 1106
Registered: June 2007
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I've got to believe that the big opening beneath the engine draws more air than the little side vents do at highway speeds. When it's idling, it shouldn't get any hotter than the liquid cooling system will allow (unless there's a problem there) so I am still wondering what problem is solved by the side vents? If the fuel delivery line is insulated, additional heat there shouldn't matter, I wouldn't think. It does let more hot air out after its shut down, so I guess there's less heat radiating into the cockpit. What other benefits do the side vents have?
Randy
1973 26' Painted Desert
Ahwatukee (Phoenix) AZ
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| Re: [GMCnet] Fender Vents [message #109242 is a reply to message #109209] |
Tue, 21 December 2010 06:47 |
Mr ERFisher
Messages: 7117
Registered: August 2005
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these vents by Emery, might be more useful, and not require holes in the
skin. (infact, I have both type of vents in my 26)
http://www.gmcmhphotos.com/photos/showgallery.php?cat=3093
and this describes the reasons for the vents
http://gmcmotorhome.info/engine.html#VENTS
have a great trip
gene
On Mon, Dec 20, 2010 at 7:02 PM, Michael <radioactive626@msn.com> wrote:
>
>
> I've got two camping trips coming up in the next two weeks. So can't wait
> to see!
> They look nice and were fast to install. I'm hoping to get more air flow as
> AZ can be brutal. This time of year isn't so bad. I'm keeping my trips short
> about 125 miles or so for now. Slowly but surely we'll venture off into more
> and more distance!
> --
> 1973 23' Sequoia-
> Michael, Casa Grande, AZ
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: Fender Vents [message #109258 is a reply to message #109188] |
Tue, 21 December 2010 09:45 |
Erv Troyer
Messages: 125
Registered: February 2004
Location: Lagrange, IN
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I picked out few lines from the various postings here:
"I feel a lot of heat coming out of my vents. Gotta help!"
" but something has got to be better then nothing"
" More air that can escape from the top region, the better cooling can be achieved. The vent allows more air to pass through the radiator as there is less back pressure at the upper area which has no venting."
" so I am still wondering what problem is solved by the side vents?"
>>>>>>>>>>>>>>>>>
Well, I suppose you are going to call me an old nitpicker, but I have never seen any numbers from any testing done with these side vents that prove that they make enough difference that I would want to chop holes in my coach.
I have worked with heating and air conditioning for many years, and I soon learned that hot and cold are relative terms - what "feels" hot or cold to me doesn't mean much until I have seen some temperature and airflow readings. I wonder - how much cooler is it under that deck with the side vents? What percentage of the total CFM of air leaving that area is actually going through those vents? Do these make any difference at all at road speeds? Give me the numbers....
But in this business I have also learned that the customer is right, and if you want vents installed in your GMC, and if you feel they are needed, then I will install them for you. Your peace-of-mind is really more important than some non-existent numbers.
And that is my opinion - as Lily would have put it "and that's all I'm going to say about that!"
Erv Troyer Lagrange, IN
74 Sequoia
reo43@aol.com
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| Re: Fender Vents [message #109260 is a reply to message #109188] |
Tue, 21 December 2010 10:02 |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
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I'm on full day #1 with the vents so have nothing LOL
However since heat rises I thought it would be good to have a location higher opposed to lower to vent heat out of. I cut the holes out, and honestly if they did nothing they look great and I've wasted $50 on alot more odd stuff. I'm just hoping here in AZ I'd think any cooler temps even slight wouldn't hurt.
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
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| Re: [GMCnet] Fender Vents [message #109306 is a reply to message #109258] |
Tue, 21 December 2010 14:28 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Erv,
I didn't like the look of the Stainless Steel vents so I bought these:
http://www.westmarine.com/webapp/wcs/stores/servlet/ProductDisplay?productId
=431825&catalogId=10001&langId=-1&storeId=11151&storeNum=10114&subdeptNum=10
665&classNum=10667
http://tinyurl.com/2g7nwda
I too worked in air conditioning for many years as a Hamilton Standard Field
Rep.
I installed the vents because whenever I'd walk by a GMC that had just been
shut down I could feel hot air coming out of the vents and knew that because
they were located just underneath the floor of the "driver/passenger
platform" at the highest and most rearward part of the engine compartment it
provided another air flow path for hot air to escape the engine compartment
in a good location.
I knew that allowing air to flow they would reduce the amount of heat
induced into the GMC driver / passenger area through the floor from the
engine compartment while under way and after shutting down. I reckoned that
was worth $8.49 each and a half hour to install them.
I'm back in Aus but I'll tell you what I'll do, next summer during our tour
I'll take some readings through the engine hatch with the vents open and
then tape them closed with duct tape and take them again. I realize that to
determine how many BTU's these vents remove from under the floor you need to
know the temperature delta and the amount of air flowing through them. You
have to cut a hole 3-5/8"W x 12-1/8"L which means you have a opening of
28.59 square inches. If there's anyone out there that remembers their
college math and can calculate the amount of CFM that will flow through that
opening at various speeds please do so as I damn sure can't!
Regards,
Rob M.
USAussie - Downunder
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Erv Troyer
Sent: Wednesday, December 22, 2010 2:45 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Fender Vents
I picked out few lines from the various postings here:
"I feel a lot of heat coming out of my vents. Gotta help!"
" but something has got to be better then nothing"
" More air that can escape from the top region, the better cooling can be
achieved. The vent allows more air to pass through the radiator as there is
less back pressure at the upper area which has no venting."
" so I am still wondering what problem is solved by the side vents?"
>>>>>>>>>>>>>>>>>
Well, I suppose you are going to call me an old nitpicker, but I have never
seen any numbers from any testing done with these side vents that prove that
they make enough difference that I would want to chop holes in my coach.
I have worked with heating and air conditioning for many years, and I soon
learned that hot and cold are relative terms - what "feels" hot or cold to
me doesn't mean much until I have seen some temperature and airflow
readings. I wonder - how much cooler is it under that deck with the side
vents? What percentage of the total CFM of air leaving that area is actually
going through those vents? Do these make any difference at all at road
speeds? Give me the numbers....
But in this business I have also learned that the customer is right, and if
you want vents installed in your GMC, and if you feel they are needed, then
I will install them for you. Your peace-of-mind is really more important
than some non-existent numbers.
And that is my opinion - as Lily would have put it "and that's all I'm going
to say about that!"
--
Erv Troyer Lagrange, IN
74 Sequoia
reo43@aol.com
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Fender Vents [message #109387 is a reply to message #109306] |
Wed, 22 December 2010 07:21 |
Erv Troyer
Messages: 125
Registered: February 2004
Location: Lagrange, IN
Karma: 0
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| Robert Mueller wrote on Tue, 21 December 2010 14:28 |
<snip> but I'll tell you what I'll do, next summer during our tour I'll take some readings through the engine hatch with the vents open and then tape them closed with duct tape and take them again. I realize that to determine how many BTU's these vents remove from under the floor you need to know the temperature delta and the amount of air flowing through them. You have to cut a hole 3-5/8"W x 12-1/8"L which means you have a opening of 28.59 square inches. If there's anyone out there that remembers their college math and can calculate the amount of CFM that will flow through that opening at various speeds please do so as I damn sure can't!
|
Good on ya', Robert - that's the kind of test I was talking about. I'm confident that you will find that the vents DO make a difference, and this will really tell us how much.
I don't know how to calculate the CFM flowing through the vents either - one would have to know the pressure difference across the vents, plus the effect of air passing across the vents at road speeds.
Keep us posted.
Erv Troyer Lagrange, IN
74 Sequoia
reo43@aol.com
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| Re: [GMCnet] Fender Vents [message #109389 is a reply to message #109387] |
Wed, 22 December 2010 07:37 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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P.P.O. of my ex-GMC coach (since left for the Big Rally in the Sky) had installed an elaborate sensor and relay controlled axial Marine fan that exhausted out the driver side vent, that he had installed. This moved a lot of air, when the compartment got warm. Never did any sensor temp probes, but it would be interesting.
I removed the elaborate sensor system, and installed a simple switch under the dash. Engaging the fan would drop the temperature gauge quickly. I mostly used it to remove heat from the engine compartment, after parking for the night.
Tom Phipps, sans GMC
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Fender Vents [message #109407 is a reply to message #109389] |
Wed, 22 December 2010 09:27 |
shawnee
Messages: 422
Registered: February 2004
Location: NC
Karma: 0
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| tphipps wrote on Wed, 22 December 2010 08:37 |
P.P.O. of my ex-GMC coach (since left for the Big Rally in the Sky) had installed an elaborate sensor and relay controlled axial Marine fan that exhausted out the driver side vent, that he had installed. This moved a lot of air, when the compartment got warm. Never did any sensor temp probes, but it would be interesting.
I removed the elaborate sensor system, and installed a simple switch under the dash. Engaging the fan would drop the temperature gauge quickly. I mostly used it to remove heat from the engine compartment, after parking for the night.
Tom Phipps, sans GMC
|
Tom,
I am not sure if you were in the Dixielanders then, but about 15 years ago I was towed into Bean Station with a bad transmission and engine fire. It turned out the transmission self distructed and blew the hose off the vent and the fluid started a fire on the exhaust. I lost all the wiring on the engine area over that. The biggest problem was I had listened to people for some time telling me how hot the engine compartment got and finally installed one of the axial boat bilge blowers right by the distributor where I figured the heat would be the highest. I also installed a sensor that would turn the blower on when the temperature reached 170 degrees. Well, after 5 years this blower never came on until the fire. The heat then got over 170 and the blower came on and pulled the fire over the top of the engine. It melted the blower and hose exhaust down to the side of the coach and burned all the wiring insulation off.
Fortunately Bill Bramlett and Dan Hudson took over and moved me out of the pit and replaced the transmission in about three hours. I was amazed with them since they had never met before but working on the transmission they hardly said a word and handed each other wrenches they needed. Two of the finest gentlemen I have ever met. Dan passed away a couple years ago but Bill still remains a good friend to me and every one he meets.
Larry Wills, who has passed away since then, was an Electrical Engineer with NASA and also a good friend shooed me away from the engine wiring and traced back each wire to where there was a color code and run a wire back to where he could find the other end color code. I was reduced to running for parts they needed. We test run the coach up the mountain about 8 hours after they started and it worked like a charm.
I had visions of spending a week or more doing all of the work and they had me on the road that quick. It never ceases to amaze me the talent, capability, and background of people at Bean Station and in the GMC group and you never know it until you need something. For some reason the GMC seems to attract the best of people.
The key to what I was getting to is I would never put a blower in the engine compartment again. If you really want to move air through the engine area the best alternative is installing an air dam under the front from Frank Jenkins or others. It not only looks good but really works.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
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| Re: [GMCnet] Fender Vents [message #109522 is a reply to message #109239] |
Wed, 22 December 2010 23:01 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Randy,
Your right about the opening at the bottom doing majority of the
exiting, but at hidher velovity of atr comming off the fan, there is
enough turbulance to where there is a stagnent pressure at the top
rear region.
On Tue, Dec 21, 2010 at 4:38 AM, Randy <Acrosport2@hotmail.com> wrote:
>
>
> I've got to believe that the big opening beneath the engine draws more air than the little side vents do at highway speeds. When it's idling, it shouldn't get any hotter than the liquid cooling system will allow (unless there's a problem there) so I am still wondering what problem is solved by the side vents? If the fuel delivery line is insulated, additional heat there shouldn't matter, I wouldn't think. It does let more hot air out after its shut down, so I guess there's less heat radiating into the cockpit. What other benefits do the side vents have?
> --
> Randy
> 1973 26' Painted Desert
> Ahwatukee (Phoenix) AZ
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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