| fire extinguisher mounting for Onan and Engine Bay [message #97825] |
Mon, 30 August 2010 16:44  |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
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Those of you who have these, where did you mount them? I just got my Onan FE and couldn't find Photos of where a good place to mount it is.
I have 2 6V batteries.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: fire extinguisher mounting for Onan and Engine Bay [message #97830 is a reply to message #97827] |
Mon, 30 August 2010 17:04  |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
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Dan, I figured you'd be the one to respond first!, I'll dig through your Blog.
thanks!
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: fire extinguisher mounting for Onan and Engine Bay [message #97832 is a reply to message #97825] |
Mon, 30 August 2010 17:07 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Dan, Found the photo. SO it mounts to the Onan it self? DOesn't all that vibration affect the gauge? I got one from JimK it has a gauge on it.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: fire extinguisher mounting for Onan and Engine Bay [message #97885 is a reply to message #97825] |
Mon, 30 August 2010 22:20 |
bhayes
Messages: 263
Registered: March 2010
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Dan, your blog mentions that the fire extinguisher activates at 286 degrees. As I've been troubleshooting my Onan's stalling issues, I measured the temp on the exhaust manifold that runs across the top after I had run it under load, and it was around 500 degrees. I suppose that where you have it mounted doesn't get nearly as hot as next to the manifold. (I also wonder if my temperature probe was accurate. 500 degrees seems VERY high.)
Bryan Hayes
'76 Eleganza II
Salt Lake City, Utah
Bryan Hayes
'76 Eleganza II
Salt Lake City, Utah
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| Re: fire extinguisher mounting for Onan and Engine Bay [message #97890 is a reply to message #97885] |
Mon, 30 August 2010 22:51 |
GMCNUSA
Messages: 283
Registered: August 2006
Location: Indianapolis, IN
Karma: 0
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| Bryan Hayes wrote on Mon, 30 August 2010 23:20 |
Dan, your blog mentions that the fire extinguisher activates at 286 degrees. As I've been troubleshooting my Onan's stalling issues, I measured the temp on the exhaust manifold that runs across the top after I had run it under load, and it was around 500 degrees. I suppose that where you have it mounted doesn't get nearly as hot as next to the manifold. (I also wonder if my temperature probe was accurate. 500 degrees seems VERY high.)
Bryan Hayes
'76 Eleganza II
Salt Lake City, Utah
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Bryan
I just finished a complete removal, cleaning, new insulation and pertronix ignition install on my Onan. With the Onan drawer closed up and door down on 84 degree day both roof A/Cs running and my long probe grill therometer in the top left corner the probe after 40 minutes read 170 degrees air temp. Since its on the side over the exhaust I was surprised at that low temp. The infra red gun reads the exhaust manifold at the left side about 700 degrees if my memory is right.
Larry Dilk
Indianapolis, IN
76 Eleganza II
Patterson 455,Turbo City TBI,
Just LOVE It!
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| Re: fire extinguisher mounting for Onan and Engine Bay [message #97892 is a reply to message #97890] |
Mon, 30 August 2010 23:31 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| GMCNUSA wrote on Mon, 30 August 2010 22:51 |
| Bryan Hayes wrote on Mon, 30 August 2010 23:20 |
Dan, your blog mentions that the fire extinguisher activates at 286 degrees. As I've been troubleshooting my Onan's stalling issues, I measured the temp on the exhaust manifold that runs across the top after I had run it under load, and it was around 500 degrees. I suppose that where you have it mounted doesn't get nearly as hot as next to the manifold. (I also wonder if my temperature probe was accurate. 500 degrees seems VERY high.)
Bryan Hayes
'76 Eleganza II
Salt Lake City, Utah
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Bryan
I just finished a complete removal, cleaning, new insulation and pertronix ignition install on my Onan. With the Onan drawer closed up and door down on 84 degree day both roof A/Cs running and my long probe grill therometer in the top left corner the probe after 40 minutes read 170 degrees air temp. Since its on the side over the exhaust I was surprised at that low temp. The infra red gun reads the exhaust manifold at the left side about 700 degrees if my memory is right.
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Just to give you some reference point, my gasoline powered airplane engine has temperature probes mounted in all of the exhaust pipes approximately 4 to 5 inches from each exhaust valve.
The temperature I see at 650 RPM idle are 700 to 800 degrees F. At low altitude cruise at 2400 rpm and 70% of power I see 1500 plus degrees. I think this is about what you would see inside the exhaust of an Onan. They are similar air cooled horizontally opposed engines, only my airplane has more cylinders.
At 1500 degrees inside I can see how the pipes could easily read 700 degrees outside.
BTW, I can get the exhaust gas temp to read even higher by leaning out the mixture. I normally only do this when I'm over 5000 feet.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] fire extinguisher mounting for Onan and Engine Bay [message #97898 is a reply to message #97895] |
Tue, 31 August 2010 04:26 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| Jiffyjet2 wrote on Tue, 31 August 2010 01:44 |
I'm obviously no expert on fire extinguishers, but that bottle and it's trigger unit mounted on the outside of the Onan just doesn't look like it will do the job. It's almost like it's mounted outside a firewall. Even if the agent is discharged I doubt it would get to the fire, most probably escaping through the vents on the door. Just my opinion.
Jess Marker
Tacoma, WA
'74 Canyonlands..."The Great Pumpkin"
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That has always been a problem with Halon. It has to totally flood the area to eliminate all of the oxygen. If there is any air / oxygen left in the protected area the fire continues.
CO2 has a similar problem but if used correctly it will also cool whatever is burning and only it has to separate the combustibles from the oxygen. I does not need to flood the entire area.
In a previous life I used to plan and engineer Halon fire suppression systems for computer rooms. We had to engineer in a shut down of all HVAC to the area to eliminate outside air flow during the dump of the halon to assure complete flooding. We also had to engineer in an alarm with a 30 second delay to allow people to exit the area prior to actually triggering the halon.
My point is if I were installing halon in the Onan area I would figure out where the air comes into the Onan area with the Onan running and try to slow it down or eliminate it. I would also try to discharge the halon in the area of the incoming air in an attempt to achieve complete flooding.
A much better solution would be AFFF in both the Onan and main engine areas. It does not need to flood the entire area. It only needs to set up a surface barrier on what is burning and provide some cooling. When it dries it does not leave anything that needs to be cleaned up.
Note: I would get alcohol resistant AFFF or AR-AFFF only because a lot of you are buying E-10 gasoline and I do not know the effect of E-10 gasoline fires. Basically AR-AFFF is the same stuff as AFFF only mixed a little heavier. It is usually mixed in the 3% to 6% range. The non-alcohol stuff is mixed in the 1% to 3% range.
JMHO
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: fire extinguisher mounting for Onan and Engine Bay [message #97925 is a reply to message #97825] |
Tue, 31 August 2010 10:25 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Senior Member |
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I was thinking of rotating it 180 degrees so the nozzle is near the exhaust. It looks to me that is the most likely point of combustion. My PO seems to have replaced the foam liner there, and there was some heat burn on that telling me the exhaust leaked there. I have a totally different unit than the original, and I have made sure there are no exhaust leaks, but still as much as that sucker vibrates, I would think it could come loose there. I plan to put a steel shield on the compartment wall adjacent to the left exhaust as well.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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