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Spark plug voltage?

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Hello all! I would like 2 know the voltage that runs throu the ignition system/spark plugs. I remember reading it somewhere b4 but cant remember xactly. If u know please dont hesitate. Thnks!
 

Trevor loves holden.

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Spark plugs usually require voltage of 12,000–25,000 volts or more to "fire" properly, although it can go up to 45,000 volts.
 

Immortality

Can't live without smoky bacon!
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I believe the stock ignition system goes up to about 40,000 volts. Aftermarket ignition systems can go a lot higher.
 
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