Engines that run at a very constant rpms have carbon build up issues. This is due to their never changing combustion chamber turbulence patterns. Engines that have ever changing rpm ranges don't develop these issues. This is the reason that our Onans require having the heads pulled off for carbon deposit removal. It's required after so many hours of operation. I don't remember that number of hours right now. So to keep your Onan operating properly. It's a very simple task to do. Anyone can do it. And I mean anyone. Bob Dunahugh Member GMCMI
spark aresters
- Thread starter Bob Dunahugh
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We now have a Catalitic converter with muffler.
Our original Onan emits smell from hydrocarbon that you can notice, this
CAT cuts it down 98%
> Engines that run at a very constant rpms have carbon build up issues. This
> is due to their never changing combustion chamber turbulence patterns.
> Engines that have ever changing rpm ranges don't develop these issues.
> This is the reason that our Onans require having the heads pulled off for
> carbon deposit removal. It's required after so many hours of operation. I
> don't remember that number of hours right now. So to keep your Onan
> operating properly. It's a very simple task to do. Anyone can do it. And
> I mean anyone. Bob Dunahugh Member GMCMI
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
Our original Onan emits smell from hydrocarbon that you can notice, this
CAT cuts it down 98%
> Engines that run at a very constant rpms have carbon build up issues. This
> is due to their never changing combustion chamber turbulence patterns.
> Engines that have ever changing rpm ranges don't develop these issues.
> This is the reason that our Onans require having the heads pulled off for
> carbon deposit removal. It's required after so many hours of operation. I
> don't remember that number of hours right now. So to keep your Onan
> operating properly. It's a very simple task to do. Anyone can do it. And
> I mean anyone. Bob Dunahugh Member GMCMI
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
Has anyone ever looked into SeaFoam spray for the Onan for carbon removal? I have personally seen it work wonders in a variety of engines large and small.
>
> Engines that run at a very constant rpms have carbon build up issues. This is due to their never changing combustion chamber turbulence patterns. Engines that have ever changing rpm ranges don't develop these issues. This is the reason that our Onans require having the heads pulled off for carbon deposit removal. It's required after so many hours of operation. I don't remember that number of hours right now. So to keep your Onan operating properly. It's a very simple task to do. Anyone can do it. And I mean anyone. Bob Dunahugh Member GMCMI
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> Engines that run at a very constant rpms have carbon build up issues. This is due to their never changing combustion chamber turbulence patterns. Engines that have ever changing rpm ranges don't develop these issues. This is the reason that our Onans require having the heads pulled off for carbon deposit removal. It's required after so many hours of operation. I don't remember that number of hours right now. So to keep your Onan operating properly. It's a very simple task to do. Anyone can do it. And I mean anyone. Bob Dunahugh Member GMCMI
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Water injection...
No myth, was common practice. Steam has nothing to do with it. Water injection was used to prevent Detonation at high RPM before all this computer
controlled ignition stuff came along. Had side effect of cleaner combustion chambers i guess..i never played with it but know its design purpose. We
always used ATF ( Automatic Transmission Fluid). Was common practice when engines had carburetors. Oil is not compressible (neither is water but will
rust things). The idea was to introduce fluid into the combustion chamber and knock off the carbon deposit build up. The oil would burn off and foul
the spark plug but it was being replaced anyway so did not matter. This helped a lot with the cars owned by the little old ladies who never got the
engine to full operating temperature going to the local grocery. Those engines were a mess to rebuild. The intake manifold heat risers were always
clogged up with carbon. Anyone who has done this knows carbon requires a hammer and chisel to remove. When you use ATF at high idle speed you are
essentially beating he-- out of the carbon deposits and everything else in the combustion chamber.
Reference https://www.physicsforums.com/threads/decarbonizing-an-engine-with-water-myth-or-fact.793344/
No myth, was common practice. Steam has nothing to do with it. Water injection was used to prevent Detonation at high RPM before all this computer
controlled ignition stuff came along. Had side effect of cleaner combustion chambers i guess..i never played with it but know its design purpose. We
always used ATF ( Automatic Transmission Fluid). Was common practice when engines had carburetors. Oil is not compressible (neither is water but will
rust things). The idea was to introduce fluid into the combustion chamber and knock off the carbon deposit build up. The oil would burn off and foul
the spark plug but it was being replaced anyway so did not matter. This helped a lot with the cars owned by the little old ladies who never got the
engine to full operating temperature going to the local grocery. Those engines were a mess to rebuild. The intake manifold heat risers were always
clogged up with carbon. Anyone who has done this knows carbon requires a hammer and chisel to remove. When you use ATF at high idle speed you are
essentially beating he-- out of the carbon deposits and everything else in the combustion chamber.
Reference https://www.physicsforums.com/threads/decarbonizing-an-engine-with-water-myth-or-fact.793344/
Back in the 60's when we had a piston knock so we would carefully sprinkle
water at mild rpm and it would clear it up.
> Years ago, didn't they spray water down the carb to rid of carbon buildup?
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
water at mild rpm and it would clear it up.
> Years ago, didn't they spray water down the carb to rid of carbon buildup?
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
Haven't you guys heard of the "Second gear tune-up" Onto the nearest
freeway on ramp, stuff it into second, stand on it, get off the freeway at
the next exit, over the overpass and back onto the freeway, head back to
the shop, shift into top and loaf it back to the shop. Kill it or cure it,
I am told.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
Back in the 60's when we had a piston knock so we would carefully sprinkle
water at mild rpm and it would clear it up.
> Years ago, didn't they spray water down the carb to rid of carbon buildup?
>
> _______________________________________________
> GMCnet mailing list
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
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freeway on ramp, stuff it into second, stand on it, get off the freeway at
the next exit, over the overpass and back onto the freeway, head back to
the shop, shift into top and loaf it back to the shop. Kill it or cure it,
I am told.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
Back in the 60's when we had a piston knock so we would carefully sprinkle
water at mild rpm and it would clear it up.
> Years ago, didn't they spray water down the carb to rid of carbon buildup?
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
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I don't disagree that water, or other liquids could clean some carbon off pistons in a car, or truck engine. Personally before I did anything by pouring liquids in. I'd first put an inspection camera in the spark plug hole to assess the situation. If so inclined. Do the dump of whatever. Then pull a few plugs to evaluate what happened. With generators. I've seen carbon build up that you could measure with a ruler. Many times it's in piles between the valves. I wouldn't like to think were those could end up. My inspection camera is a very important tool in my tool box. Bob Dunahugh 78 Royale Iowa
________________________________
From: Bob Dunahugh
Sent: Sunday, December 24, 2017 11:37 AM
To: gmclist
Subject: RE: spark aresters
Engines that run at a very constant rpms have carbon build up issues. This is due to their never changing combustion chamber turbulence patterns. Engines that have ever changing rpm ranges don't develop these issues. This is the reason that our Onans require having the heads pulled off for carbon deposit removal. It's required after so many hours of operation. I don't remember that number of hours right now. So to keep your Onan operating properly. It's a very simple task to do. Anyone can do it. And I mean anyone. Bob Dunahugh Member GMCMI
________________________________
From: Bob Dunahugh
Sent: Sunday, December 24, 2017 11:37 AM
To: gmclist
Subject: RE: spark aresters
Engines that run at a very constant rpms have carbon build up issues. This is due to their never changing combustion chamber turbulence patterns. Engines that have ever changing rpm ranges don't develop these issues. This is the reason that our Onans require having the heads pulled off for carbon deposit removal. It's required after so many hours of operation. I don't remember that number of hours right now. So to keep your Onan operating properly. It's a very simple task to do. Anyone can do it. And I mean anyone. Bob Dunahugh Member GMCMI
