| Stinky Onan [message #88146] |
Fri, 11 June 2010 22:23  |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Senior Member |
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I'd bet this is normal, but my Onan Stinks. I don't know if it is running rich, but it sure smells like it. It runs great, under full load or not. Jerry's got this thing setup so nice that I hate to tweak anything.
If I had an awning, I would probably suffocate.
Time for a Venturi.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: Stinky Onan [message #88187 is a reply to message #88146] |
Sat, 12 June 2010 07:43  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Chr$ wrote on Fri, 11 June 2010 23:23 |
I'd bet this is normal, but my Onan Stinks. I don't know if it is running rich, but it sure smells like it. It runs great, under full load or not. Jerry's got this thing setup so nice that I hate to tweak anything.
If I had an awning, I would probably suffocate.
Time for a Venturi.
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Chris,
Old cold flatheads (like the Onan) were notorious for aldehyde emissions (an artifact of P-poor combustion processes). Stink and make your eyes water.
These old engines will run WAY RICH, but not much lean. They do stink when they are rich.
First, try tweaking the main jet in the carburetor (the one in the bottom). An eighth of a turn may be too much. Put on all the load you can manage and then lean it out until it starts to sag.
If that does not make a mountain of difference, think about the de-carbon job. If it has been run rich, it may need it real bad.
A stack isn't a bad idea, if you can figure out how to carry it.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Stinky Onan [message #88216 is a reply to message #88187] |
Sat, 12 June 2010 09:08 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Senior Member |
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Thanks Matt. It has been chemically decarboned by Genset Jerry In Tucson.
I may ping him for ideas...
-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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