| Onan Fuel Consumption [message #112112] |
Sun, 16 January 2011 02:07  |
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Well today I did a little test of the onan, I hooked it up to an outboard fuel tank which I then filled with exactly 3 gallons of fuel. I then fired the beast up and went inside, turned on a 42 inch TV and Playstation, water heater, and ran the onan for 5 hours while I played Assassins Creed brotherhood. I would guess this is approximately 1/4 to 1/3rd load. When I shut off the onan I was surprised to find a decent amount of fuel still left in the outboard tank, so using a large pyrex measuring cup, I measured the remaining fuel, there was 1 gallon and 16 ounces left! So that means the onan ran for 5 hours on 1 7/8 gallons of fuel! Not bad for a 37 year old powerplant...
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: Onan Fuel Consumption [message #112113 is a reply to message #112112] |
Sun, 16 January 2011 02:10  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Someone came up with the figure of .8 gallons per hour at full load. I have no idea of that figure is accurate or even realistic. I am just throwing it out there for you to think about in your consumption calculations.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Onan Fuel Consumption [message #112129 is a reply to message #112121] |
Sun, 16 January 2011 10:13 |
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Well it might seem I have bested those expectations. Though my onan isn't stock, running a pertronix with 27* total timing, so that is considerably more than stock, I opened the plug gap and used a hotter plug as well as leaned the mix to just where it runs super smooth. all in all I am quite satisfied, granted its not one of those hyper efficent inverter gens which will run 12 hours on a gallon of gas, but for the size and age of the unit, still impressive! Also I have the 6kw unit.
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: [GMCnet] Onan Fuel Consumption [message #112131 is a reply to message #112129] |
Sun, 16 January 2011 10:19 |
Bob Maxwell+
Messages: 75
Registered: November 2010
Location: Belén, New Mexico
Karma: 0
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Shan, it's the AC's, esp if you use 2 in high heat and or humidity like we
s'westerners do, that puts the full load on the Onan -not your regular
household items.
Bob Maxwell†
Life's journey is not to arrive at the grave safely in a well preserved
body, but rather to skid in sideways, totally worn out, shouting "...Thank
you Jesus ...what a ride!"
>>Well it might seem I have bested those expectations. Though my onan isn't
stock, running a pertronix with 27* total timing, so that is considerably
more than stock, I opened the plug gap and used a hotter plug as well as
leaned the mix to just where it runs super smooth. all in all I am quite
satisfied, granted its not one of those hyper efficent inverter gens which
will run 12 hours on a gallon of gas, but for the size and age of the unit,
still impressive! Also I have the 6kw unit.
bryant374 wrote on Sun, 16 January 2011 09:18
> For what its worth:
>
> According to the Onan literature,(see link below) fuel consumption is as
follows:
> 4kw "average fuel consumption" is 0.88gph
>
> 6kw "at load" is 1.3gph
>
>
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=8351&cat=3743
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| Re: Onan Fuel Consumption [message #112133 is a reply to message #112112] |
Sun, 16 January 2011 10:59 |
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Bob, that I understand, this test was mostly a 1/4 load test. I did turn on the water heater which the new one I have pulls 1.5kw so that was also on for the duration of this test but depending on the heat cycling was probably for an hour only....
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: Onan Fuel Consumption [message #112139 is a reply to message #112112] |
Sun, 16 January 2011 11:51 |
Oldngray
Messages: 544
Registered: August 2009
Location: Punta Gorda Florida
Karma: 0
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Senior Member |
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Some time ago I posted the following,
I tried using the Onan and the roof air instead of the Dash air, after 2 trips totally 1700 miles, I found that the difference in MPG dropped from 8.9 with the dash air to 6.8 with the Onan and roof air.
It may well be that my Onan is not set up right but it sure starts and runs nicely.
JWID
Richard MacDonald
Punta Gorda, Florida
Sold our TZE April 2015
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| Re: Onan Fuel Consumption [message #112191 is a reply to message #112139] |
Sun, 16 January 2011 22:30 |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Senior Member |
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Duce, give it a try with just the a/c on, one of them if you have 2. Thats the only time we ever use our Onan, running the a/c down the road on a real hot day.
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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