| Re: [GMCnet] Onan ignition questions [message #322591 is a reply to message #322584] |
Thu, 24 August 2017 06:21   |
Jim Miller
Messages: 501
Registered: March 2008
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> On Aug 23, 2017, at 11:22 PM, Ken Burton wrote:
>
> I watched the points open and close with a test light.
> One thing I have not done yet is to disconnect the condenser / capacitor across the points.
Hi Ken,
Capacitors are notorious failure items — always always consider them early on in the ignition troubleshooting process. In addition to its role of quenching the arc across the points when they open, the condenser forms half of an LC network between the coil primary and itself. As the points open and the magnetic field in the coil collapses it sends some energy back into the primary and this LC network on the primary side serves to temporarily store that energy and “push” it back into the coil where it contributes to the secondary’s discharge voltage.
Also consider that RFI filter that attaches to the coil - if your unit still has it; I’ve seen these act up as well.
I’ve used JimK’s coils as well as some dual-tower Denso’s that I’ve scavenged off of modern small engines - they all work fine - and several of the ones I’ve scavenged have had 30-40kOhm secondaries. I would argue that the inductance characteristics of the coil’s primary and secondary is of more import than the resistance.
Jim Miller
1977 Eleganza
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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