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Old 01-14-2020, 05:24 PM
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where does the spark go?

What happens if the spark doesnt make it to the plug, and doesnt leak out anywhere? Does that destroy the coil?

I had some bad wires.Spark was leaking out here and there. I replaced them all. When I checked the cap, which is only a few months old, there was white build up on all the contacts. Is that because of the malfunctioning system? I had never seen a cap that looks quite like that.

I didnt run like that for long, but I started wondering about what types of damage could be caused by a malfunctioning system ? In general.

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Old 01-14-2020, 07:07 PM
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The short answer is 'to the path of least resistance' .

A fouled plug will use it up in resistance, a bad wire will either fire out through the insulation, or cause a cross fire to the next distributor term. If the primary and secondary winding are good, it will spark somewhere.
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Old 01-14-2020, 08:25 PM
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To ground somewhere. On must remember, for the spark to jump the gap on the plug takes a large amount of energy. If there is a path to ground anywhere in the ignition system, the spark energy will take the path of least resistance.

Keith
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Old 01-15-2020, 01:08 PM
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Thanks y'all.

One more question.
What happens when you pull the coil wire, and crank it over?

That seems to be a common way of keeping an engine from starting when working on something. Is that a bad idea?
If so , whats the best way to disable an ignition system, or keep the engine from
starting?
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Old 01-15-2020, 01:12 PM
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Crank it too much and the wire swells up with the sparks gathering up on the end until it splits open, they fall out onto the floor and when you walk around with socks on they cling to your feet and jump the nearest door knob.
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Old 01-15-2020, 01:52 PM
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When you crank the engine and do not want the plugs to fire, always disconnect the 12v primary wire that is connected to the positive (+) post on the coil. If you have a separate coil. Do not pull any secondary wires from the distributor cap. High secondary Voltage created by the coil must have somewhere to go (terminate) or you will degrade the coil.

When you disconnect the positive connection on the coil, that will disable the entire ignition system.
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Old 01-15-2020, 06:29 PM
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I pull the secondary wire from the coil at the distributor cap and ground it to the head, intakeor block which ever it reaches to. For HEI I just pull the primary connector on the side of the cap which cuts off the 12 volt supply.

These are usually the most convenient solutions.

Bogie
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