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Possibilities, onan 5kw un gen mated to a Italian diesel


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  #1  
Old 12-10-2014, 01:31:43 AM
YellowLister YellowLister is offline
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Default Possibilities, onan 5kw un gen mated to a Italian diesel

I have a extra 5kw cck (un) rotor and stator removed from a cck with a rusted cylinder bore beyond repair.. was thinking about mating it to a ruggerini 2 cylinder air cooled diesel engine removed from a 10kw (at 3000 rpm) 50 hertz 3 phase gen with shorted windings.. the diesel should make 12 to 14 hp at 1800 rpm

The un gen is exciter cranked.. while the diesel has its own starter and battery charging system..

I wondering if the un gen end would be ok running with the dc brushes removed as there not needed.. I guess I could use the gen end to start the diesel if its capable of doing so.. but would rather not go that route..

anyone have any idea if that is a possibility? or ever tried something like this?

today I checked to see if the gen end would match up to the diesel engine.. and it actually would perfectly to my surprise.. even the bell housing bolts line up to the old bolt holes for the old 3 phase gen end..

another question.. since the un gen uses a stop start "relay", once the engine is running it pulls in and supply's dc power for the ignition and to charge the battery.. If this is removed would the ac part still work correctly when the diesel is started..

I guess I have a lot of tinkering to do..

thoughts> ideas?? yes I know its like putting a Italian tractor engine in a old chevy truck.. but it sure would be cool..
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Old 12-10-2014, 09:20:17 AM
Ted_Cool Ted_Cool is offline
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Default Re: Possibilities, onan 5kw un gen mated to a Italian diesel

I think you should probably leave the DC brushes right where they are.

I'm pretty sure the DC output is used as the field current.

It sounds like a fun project! I'd love to see it if you get it done.
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Old 12-10-2014, 10:25:58 AM
Joe33 Joe33 is offline
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Default Re: Possibilities, onan 5kw un gen mated to a Italian diesel

I have two Ruggerini powered Italian tractors with 2 cyl air cooled engines.

In your configuration as a generator I would think the Ruggerini would last forever plus a long time after that…

I machined an oil filter adapter that replaces the expensive Italian filter with an off the shelf NAPA unit.

Sounds like a great project...keep us posted.
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Old 12-10-2014, 08:12:41 PM
hoppyhunts hoppyhunts is offline
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Default Re: Possibilities, onan 5kw un gen mated to a Italian diesel

I am also interested in your project. I have a useable 10kw Ruggerini powered unit, that absolutely screams at 3600rpm. Makes one wonder how long it can take it, but it does!! Being able to match up a UN head to it, and turn the RPM's down to a reasonable level, appeals to me too. I happen to know where there is another Ruggrini powered 8.5kw unit with a burnt out gen head, that I might be able to acquire for a project. Please keep us posted.
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Old 12-10-2014, 08:49:44 PM
YellowLister YellowLister is offline
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Default Re: Possibilities, onan 5kw un gen mated to a Italian diesel

it will be awhile.. the rotor shaft on the onan part is larger than the output shaft on the diesel engine.. so ill have to machine up a adapter.. good thing I have a friend with a full machine shop..
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Old 12-10-2014, 10:23:06 PM
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Jim McIntyre Jim McIntyre is offline
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Default Re: Possibilities, onan 5kw un gen mated to a Italian diesel

Can you get the data sheet for your engine? I'd want to see if the timing needs to be tweaked in going from 3000 to 1800 rpm. Also, I'd be a little concerned that the governor performance would degrade at the lower speed...
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Old 12-10-2014, 10:33:20 PM
YellowLister YellowLister is offline
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Default Re: Possibilities, onan 5kw un gen mated to a Italian diesel

it has the adjustable throttle by a twistable adjustment on the instrument panel.. or by hand on the injection pump lever itself.... it idles fine and will rev up pretty good..
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Old 12-10-2014, 10:50:28 PM
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Default Re: Possibilities, onan 5kw un gen mated to a Italian diesel

Of course it runs at 1800, but how's the governor droop? Unfortunately, no way to tell without being able to apply full load to the engine...
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Old 12-10-2014, 11:57:51 PM
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Default Re: Possibilities, onan 5kw un gen mated to a Italian diesel

only one way to find out.. there's a 8kw belt driven gen on craigslist for 125 I might buy and call it a day.. I also have a older onan 3kw that would tell a story.. see if I can load it up with that one and see what happens..

they all spin at 3600.. but I have some pulleys so the engine can run at about 2100 rpm
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Old 12-11-2014, 12:32:28 AM
Joe33 Joe33 is offline
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Default Re: Possibilities, onan 5kw un gen mated to a Italian diesel

I have copies of the parts and service manuals for the Ruggerini RD200 engine if it should ever get to that..

I rebuilt one of my engines just a few days after I brought the tractor home...something about the engine running while the tractor was inverted in a creek had a negative effect on the valve train...
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