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Onan 4.0 BGE electronic conversion


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  #11  
Old 03-16-2017, 10:46:43 PM
len k len k is offline
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Default Re: Onan 4.0 BGE electronic conversion

Both cylinders fire at same time, waste spark system. It fires every time a piston is close to TDC , whether it's just before the power stroke or just before finishing the exhaust stroke.

Given the way it's designed ignition doesn't know which cylinder is ready for power stoke. And way it's designed the swing of magnets past ignition modual is same for both power strokes. So don't see why it would vary between cylinders given the way it's designed.

Suspect they don't know what there talking about.
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Old 03-16-2017, 10:49:17 PM
deno deno is offline
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Default Re: Onan 4.0 BGE electronic conversion

I suspected it had to do with mechanical delays of a pushrod timing system and points. Whereas a magnetic or hall effect sensor wouldn't have that issue.
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Old 03-16-2017, 11:02:07 PM
len k len k is offline
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Default Re: Onan 4.0 BGE electronic conversion

If points cam is on valve camshaft that would imply each points cam is off a little. Would think standard machine shop accuracy would yield better matched cams than that.

On the other hand 1-2 deg error is close enough on timing, don't think your going to be able to detect any noticeable performance difference.
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Old 03-16-2017, 11:04:13 PM
deno deno is offline
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Default Re: Onan 4.0 BGE electronic conversion

I am going to do the upgrade. Is it a good idea to uograde the coil, or any other related parts?

waiting for a parts list from that thread.
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Old 03-16-2017, 11:08:39 PM
len k len k is offline
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Default Re: Onan 4.0 BGE electronic conversion

I'ld say a coil is a coil, just make sure your ignition electronics can supply current coil draws. If not may need to add a resistor in series with coil.

Could try using a hi- energy coil. When cars did that starting became MUCH easier and faster. I was considering a Chevy modual and Saturn coil for my JB , but turned out the old JB coil was good., so I abandoned the idea. It was a cost saving issue, I had the coil and junkyards have good cheap parts here.
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  #16  
Old 03-17-2017, 06:02:32 PM
deno deno is offline
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Default Re: Onan 4.0 BGE electronic conversion

Do you have an idea why it would surge from 125-135 volts back and forth? If I increase the idle screw, it seems to smooth out. However then my voltage is around 140+.

I've torn out the old charging system in the bottom half of the floor panel inside the cabin. Right now I am using a Schumacher SE-1555A, and was thinking it put out 55A continuous. But in the small print only found on the face of the unit, it's 60 sec on, 120 sec off cycling.

I want to order a $200 PD9260C, and their support says it does 60A continuously (up to).

Concerned about the idle not being consistent. It's the governor doing it. Any adjustment or ??
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Old 03-17-2017, 06:36:30 PM
len k len k is offline
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Default Re: Onan 4.0 BGE electronic conversion

In your 4 kw BGE spec C output voltage is proportional to rpm. It's has a transformer AC "regulator". It doesn't really regulate voltage, just boosts rotor excitation as load increases to keep voltage from sagging.

Usually rpm hunting is caused by a dirty carb, Try taking it apart and cleaning it.
Although I've been able to stop minor hunting on a Generac by making main jet richer.

You don't adjust the carb idle stop screw to bring up rpm, you adjust the governor.
Service Manual has instructions on how to adjust the carb (idle jet, main jet, and idle stop) and governor.

I don't know much about inverts, others here do. Some don't like voltage and HZ varying a lot.



Manuals numbers and link to them.

BGE-BGEL spec a-c SERVICE--(5-89)--- 965-0530.pdf
BGE, BGEL PARTS--spec A-E---965-0232.pfd.pdf
BGE-BGEL--INSTALL---965-0630.pdf
BGE-NHE OPERATOR---965-0176.pdf

http://www.twinslan.net/~n0nas/manuals/onan/

Last edited by len k; 03-17-2017 at 07:49:22 PM.
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