| [GMCnet] Onan gas consumption [message #92505] |
Sun, 18 July 2010 23:05  |
Charles
Messages: 455
Registered: January 2004
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Does anybody know what is the average gas
consumption of a 6000 watt Onan is per hour.
It seems like this was covered a couple years ago
but I don't find it anywhere.
Charles
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Charles Wersal
Duncanville, Texas
26 foot 1975 Glenbrook
Pandora's Box
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| Re: [GMCnet] Onan gas consumption [message #92507 is a reply to message #92505] |
Sun, 18 July 2010 23:23  |
pzerkel
Messages: 212
Registered: September 2007
Location: Salisbury, IL
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I seem to recall seeing it was about one gallon per hour. But I cannot find now where I saw that.
Paul Zerkel
'78 Eleganza II
Salisbury IL (near Springfield)
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| Re: [GMCnet] Onan gas consumption [message #92587 is a reply to message #92505] |
Mon, 19 July 2010 15:06 |
bobby5832708
Messages: 237
Registered: November 2006
Location: Winter Springs FL
Karma: 3
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Since I was going to be working on the GMC today I figured I would find out for myself what the fuel consumption of the 6000 Onan is. Here's what I did:
I used a large Belvedere vodka bottle which is 60 ounces (just under 2 quarts) to the brim. I took some fuel hose and connected it to the Onan, stuck the other end into a gas can, and got the Onan warmed up running a 13.5K Carrier lo-profile air conditioner. After a few minutes I moved the hose to the gasoline-filled vodka bottle and started the timer. The bottle was empty in 58 minutes.
I put the hose back into the gas can, refilled the vodka bottle with gasoline, and started the second air conditioner, a 13.5K Penguin. Moving the hose to the bottle and restarting the timer, with both airs running the bottle was empty in 41 minutes.
So, with one A/C running the Onan 6000 uses a half gallon an hour. With both airs running it uses a bit under 3/4 gallon an hour.
Bob Heller
2017 Winnebago 29VE
Winter Springs FL
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| Re: [GMCnet] Onan gas consumption [message #92588 is a reply to message #92587] |
Mon, 19 July 2010 15:17 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Inquiring minds want to know, how long to empty the original contents of the 2 qt bottle.  Thanks for the semi-controlled experiment, your findings seem to match what I've heard or read on the subject.
I am guessing that this is with the stock ignition system. I believe an electronic ignition may produce better results, but not to any significant extent. I installed a CDI in mine (still using Onan points) and it improved the running of the generator. Now, to finish re-building the carb.
Tom Phipps,
75 GMC Ex-Avion, with a 6k version of Mr. Onan's generator.
2012 Phoenix Cruiser model 2552
KA4CSG
[Updated on: Mon, 19 July 2010 15:18] Report message to a moderator |
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| Re: [GMCnet] Onan gas consumption [message #92595 is a reply to message #92505] |
Mon, 19 July 2010 16:47 |
bobby5832708
Messages: 237
Registered: November 2006
Location: Winter Springs FL
Karma: 3
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Tom,
Let me see if I can make this sound like a report:
We just got back home yesterday from an 8 day trip in the GMC, so the vodka consumption had noticeably increased over the last week or so. Usual consumption is about 2qt/month (one bottle) between Donna and myself, sometimes more during the time of year that air conditioning is needed. When two air conditioners are needed then the vodka and cranberry juice (or lemonade) consumption can be excessive.
The empty bottle came in handy today. I was looking for something that gasoline wouldn't dissolve and that had a small neck, unlike a can, so evaporation (and fire hazard) would be minimized.
I still have the type 1 points on the Onan. I put a standard Delco condenser on the coil negative terminal and removed the one from the breaker point box, it makes servicing the points easier with only points in the point box. I've got about 2 years on this set and the Onan still runs fine. I've got several points sets in the toolbox so I will need to use them up before converting to Pertronix or other switching device. At the current rate that will be in about 6 to 8 years.
I've noticed that when people change out the generator they mainly use Honda and Generac units. What's wrong with a new Onan? I think these old Onan power-drawer generators are pretty durable units and plan to keep mine until it needs expensive repairs. The way it's been for me so far is, yes, occasionally it breaks, but it costs peanuts to fix. When something expensive happens to this one I would definitely look to buy another Onan. This one is almost 37 years old and still going strong, hopefully Onan makes their current generators to last like this one.
Enough rambling, gotta get back to work!
Bob Heller
2017 Winnebago 29VE
Winter Springs FL
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| Re: [GMCnet] Onan gas consumption [message #92598 is a reply to message #92594] |
Mon, 19 July 2010 17:12 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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"LOL, I am thinking a 1/2 gallon milk container might be better for me.
Dan "
Ha! Or, better yet, a half gallon ice cream container!
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Onan gas consumption [message #92612 is a reply to message #92505] |
Mon, 19 July 2010 19:48 |
David L Greenberg
Messages: 899
Registered: January 2004
Location: Port St Lucie, FL
Karma: 0
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On Mon, 19 Jul 2010 15:06:36 -0500 Bob Heller <rheller@cfl.rr.com>
writes:
>
>
> Since I was going to be working on the GMC today I figured I would
> find out for myself what the fuel consumption of the 6000 Onan is.
.
>
> So, with one A/C running the Onan 6000 uses a half gallon an hour.
> With both airs running it uses a bit under 3/4 gallon an hour.
>
>
>
>
> --
> Bob Heller
> 1974 X-Canyonlands 26ft
> Winter Springs FL
Thanks Bob-You confirm exactly what I told the troops earlier today.
"The spec is in the Onan manual but as I recall it is 1/2 GPH at half
load
and 3/4 GPH at full load."
David Lee Greenberg
Port St Lucie, FL skype: david.lee.greenberg
Dedicated to the Preservation of the Classic GMC Motorhome
http://GMCmhRegistry.com
http://www.picturetrail.com/gmcregistry
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