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Onan Electronic Ignition and TriFuel... How To


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  #31  
Old 03-30-2012, 05:18:17 PM
MBB MBB is offline
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Default Re: Onan Electronic Ignition and TriFuel... How To

Yes that bearing can be easily lost The switching of shafts is not that big of a deal. Grind the top until you just see the outline of the shaft wiggle it back and forth and it comes off swap it and if you dont have a welder bring it to a place like Midas muffler or the like and they will weld it it takes bout 2 minutes. I would bring just the shaft though I welded mine.
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  #32  
Old 03-30-2012, 05:36:54 PM
bobbyz72 bobbyz72 is offline
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Default Re: Onan Electronic Ignition and TriFuel... How To

if the ball bearing is lost, its just a standard bb for a bb gun.
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  #33  
Old 11-08-2012, 01:16:10 AM
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Jim McIntyre Jim McIntyre is offline
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Default Re: Onan Electronic Ignition and TriFuel... How To

I hope no one minds if I resurrect this thread. As I read through it, I gathered that the drill location that bobbyz72 worked, but he only got about 50% power. I've also read in several threads that a better place to drill a CCK carb is as shown in the attached picture.

It looks like if I drill in the upper boss location, the hole will pop through the middle of the venturi.

I have a few questions for someone that has a CCK Gaseous fuel carb in-hand:

What hole diameter is used?

Does it break through pretty much into the middle of the venturi?

Is there a tube fitted into the hole that protrudes into the venturi?


Thanks!
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  #34  
Old 11-08-2012, 03:47:31 AM
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Photo Re: Onan Electronic Ignition and TriFuel... How To

The Marvel-Schebler VD carburetors are drilled 17/64" at the upper largest round indentation boss which is centered on the venturi. The gaseous adapter is held to the side of the carburetor by two screws.
The upper screw boss, just below the drilled opening, is tapped 8-32. The lower screw boss is tapped 12-24.
A round gasket is used between the adapter and the carburetor.
There are two needle valves in the adapter. The large needle valve is the main fuel adjustment. The small needle adjusts the idle/low speed mixture.
The adapter is tapped 1/8" pipe to feed adjusted idle fuel to the carburetor body at the drilled boss adjacent to the gasoline idle mixture needle boss. The opposite end of the 3/16"copper idle feed tube is simply a slip fit into the carburetor boss.
Whenever any carburetor is drilled for gaseous fuel it must be drilled at the venturi in order to send the proper vacuum signal to the demand regulator.
The Walbro used on some Onans, like the BFA and some NHs for example, can be drilled for gaseous fuel at the venturi, but the carburetor can no longer be used for gasoline because the only location they can be drilled is at the point where gasoline enters the venturi.
But, after removing the Walbro carburetor and the adapter from my NH, I was able to bolt on a Marvel-Schebler VD tri-fuel carburetor because the manifold was orignally designed for the Marvel-Schebler. It fits perfectly, linkage and all.
I'm in the process of assembling this portable, propane fueled, 65KW NH to replace my 4KW BF which will become my back-up to my NH.

http://www.smokstak.com/forum/pictur...pictureid=6206
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  #35  
Old 11-08-2012, 07:52:16 AM
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Default Re: Onan Electronic Ignition and TriFuel... How To

Jim this is how I did mine. See http://www.smokstak.com/forum/showthread.php?t=88052 I never did load test it all the way. I need to have my gas meter replaced it was not large enough. It was March when I was testing still cold. I made a mistake though and played with my demand regulator. Im not sure I ever got it right. The correct location is the upper boss. I got my demand regulator from uscarburetion (spelling?) The regulator I got had a remote electric primer and the metering valve already on it no need for a ball valve or gate valve. I never went back and had a larger meter installed. It runs well on gasoline and I got distracted with my jbs.
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  #36  
Old 11-08-2012, 10:12:34 AM
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Default Re: Onan Electronic Ignition and TriFuel... How To

Thanks guys. 17/64 hole is easy enough, and it will be in the middle of the venturi, as I thought.

One thing is still unclear, though. If you look down through the top of the carb at the inside of the venturi, what do you see? Just the 17/74 hole in the wall? Or is there something else, like a tube or something?
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Old 11-08-2012, 07:19:43 PM
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Default Re: Onan Electronic Ignition and TriFuel... How To

There's no tube.
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Old 11-08-2012, 08:01:12 PM
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Default Re: Onan Electronic Ignition and TriFuel... How To

That area is VERY thin. Put a big gloob of jb weld around it. For best results, your timing should be set from 19, to 21 for gasoline/natural gas, and 25 for natual gas only, because natural gas/propane burns slower. Also the heads should be cut or replaced with higher compression heads. Any desent shop and cut the heads down. Even with all of this, you still aint going to get 100% of the power.
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  #39  
Old 11-08-2012, 08:56:15 PM
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Default Re: Onan Electronic Ignition and TriFuel... How To

Quote:
Originally Posted by bobbyz72 View Post
...Even with all of this, you still aint going to get 100% of the power...
Hmm.

Now that sounds like a challenge...

lokay5 - so when you look at the inside of the venturi, all you see is the 17/64 hole? Great! That's easy...

Thanks again guys - I'll report back when I get this thing running...
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  #40  
Old 11-08-2012, 09:52:46 PM
Ted_Cool Ted_Cool is offline
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Default Re: Onan Electronic Ignition and TriFuel... How To

Good to see you back, Bobby!

Can you cut the heads down on a flat head engine just the same as you would on an OHV engine?

I haven't looked at a CCK head in quite a while...
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