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Mustang Technical Discussion > Pre 1973 > electronic ign > Community Forums > Mustang Forum Australia - Mustang Tech

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123abc
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how much voltage can electronic ign take or how bigger coil is the question I have a large race coil with I think 50,000 or 60,000 volt in the shed my large capacity coil crapped out and I have a new one spare


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boofhead
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The key is the ohms of the coil the ignition can drive and go from there.


I will someday think of something clever to say.

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hybrid
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boofhead wrote
The key is the ohms of the coil the ignition can drive and go from there.


Spot on. The output voltage is irrelevant. If the input resistance of the coil is too low for the system, you may burn it out through over current.


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123abc
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s the new coil is a 3ohm the old one is a 1.4 ohm I can use the 3.0


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hybrid
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Yes, higher resistance is fine as far as current draw goes.
It's definitely the coil?

A 1.4ohm coil will burn out an igniter if it's not designed for it.


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123abc
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the 1.4 ohm is the original spec coil for the dizzy the spare is a3ohm im just checking that it wont burn anything out going up in ohms range


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hybrid
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Ohms law says current = Volts / Resistance

So if you increase resistance for the same voltage, you will lower the current.
However, power = volts x current

So if you have less current for the same voltage, you have less power.
So you may not have as good a spark, but that depends on the design of the new coil too, so just try it and see how it goes.


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123abc
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I see so the higher the number in ohms the higher the resistance well if the systems designed for 1.4 I will go and get another coil tomorrow

cheers


Last edited by 123abc on Sat Jun 24, 2017 6:19 pm; edited 1 time in total

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hybrid
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Yes, ohms is a measure of resistance.


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