| [GMCnet] Auxiliary fan for onan [message #319274] |
Mon, 19 June 2017 00:38  |
ron preston
Messages: 46
Registered: November 2016
Karma: 1
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I read Richards post in the past regarding the temps of the onan
compartment, would it make any sense to install a 12 volt blower ?(maybe
thermostatically controlled) They seem to help cool the 455 compartment
but my wife hates the noise. Certainly wouldn't help the functioning of a
halon unit though.
Ron Preston
75 Glenbrook
San jose
Soon to add under dash AC from Jim K?
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| Re: [GMCnet] Auxiliary fan for onan [message #319278 is a reply to message #319274] |
Mon, 19 June 2017 06:52  |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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One of the Marine Axial fans might work well in this application. Thermostat controlled switches are easy to obtain. You could also 'roll' your own, using an Ardunio. Be sure to consider some way to detect an actual fire in the compartment. A running fan would
really add to the problem.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Auxiliary fan for onan [message #319280 is a reply to message #319274] |
Mon, 19 June 2017 07:33 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Take a look at the 'new genset' pictures in my albums on the photosite. The 23' had an auto radiator fan attached to the bay door which pressurized the com[partment. It was powered through a relay on the fuel pump.
--johnny
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] Auxiliary fan for onan [message #319282 is a reply to message #319274] |
Mon, 19 June 2017 08:27 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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It is my opinion that it would not be much help. You already have a large 12" or 13" 1800 rpm fan on the front of the generator sucking fresh air in the lower rear, then across and through the generator and engine, and blowing it out of the lower front. I'm not quite sure where you would get additional air for another fan and where you would exhaust it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Mon, 19 June 2017 10:59] Report message to a moderator |
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| Re: [GMCnet] Auxiliary fan for onan [message #319287 is a reply to message #319274] |
Mon, 19 June 2017 11:20 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Ken, the fan I had (sold the coach) blew air into the compartment at a greater rate than the genset blew it out. This means the compartment is under positive pressure relative to the outside, which means more air goes across the genset, and the genset fan pushes instead of pulling and pushing. This also helps make up for leaks in the tin around the genset. It was put it for the Junkerac which came with the coach, and I considered it essential for the heathen chinee set it left with, especially since the H C one was a contractor set removed from the frame which has an exhaust pipe going through the compartment to the outside muffler.
--johnny
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] Auxiliary fan for onan [message #319314 is a reply to message #319287] |
Mon, 19 June 2017 21:46 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Johnny, My comments were strictly about an OEM installed Onan. I have no clue what would be required or possible to lash up with some other brand in there.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Auxiliary fan for onan [message #319317 is a reply to message #319274] |
Mon, 19 June 2017 23:46 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Ron the main engine cooling blower will do more than any sux blower.
You can make it be more efficient with air deflector and oil filter Air seal
Also run Full Synthetic oil
Sent from my iPhone
> On Jun 18, 2017, at 10:38 PM, ron preston wrote:
>
> I read Richards post in the past regarding the temps of the onan
> compartment, would it make any sense to install a 12 volt blower ?(maybe
> thermostatically controlled) They seem to help cool the 455 compartment
> but my wife hates the noise. Certainly wouldn't help the functioning of a
> halon unit though.
> Ron Preston
> 75 Glenbrook
> San jose
> Soon to add under dash AC from Jim K?
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Auxiliary fan for onan [message #319318 is a reply to message #319317] |
Tue, 20 June 2017 06:22 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Remember if your foam seal around the Onan oil filter has succumbed to dust, being 40+ years old, a typical can foam cooler will easily and cheaply do the job.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Auxiliary fan for onan [message #319404 is a reply to message #319274] |
Wed, 21 June 2017 14:43 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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I have thought about adding a 'Pancake' motor type fan that would run onl when shut down to cool the compartment and help evac any vapors, but I have to agree the onan fan will move far more air while running
Those fans can be found at auto swap meets for cheap- they do pull a lot of amps for their size though.
76 Glenbrook
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