A quick question:
If a set of ignition leads with a specified resistance of 5K Ohms, all increase to 6K Ohms would this be enough to stop the engine starting when cold, but perhaps keep a hot engine running?
Thanks in advance
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An even quicker answer:
No.
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Another No. But ignition leads are usually different lenghts so either you have carbond conductor leads all the same length or copper leads but fixed resistor plug caps. But the answer is still no. Regards Peter
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Yet another No.
It's the order of resistance that's important, not the exact value.
5K or 6K it really wouldn't make any difference, 10K probably wouldn't matter, but 100K could well cause problems.
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When I did mobile tuning we regarded anything under 20k as acceptable,a few inches difference in length makes no difference.King leads failed most,generally doing more work than the other four(or more).
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This is a very valid question. Carbon leads normally have a nominal resistance of 15Kohms per metre, so 6k for the average lead is about right. However what happens in these leads over time is that they break down inside and form spark gaps internally which in-turn leads to arcing on cold damp conditions, causing missfiring and/or loss of power.
Its always a good test of leads to start the engine on a cold dark night and look in the darkness for this arcing.
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Just for information. The resistance of carbon leads depends on the car and the make of leads. a Pug 106 has 1.2 to 1.5 per 300mm ( ft ) and of course the resistance of the lead is proportional to it's length. Regards Peter
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