Voltage builds first, BEFORE it is sent to the spark plugs. The current does only ONE thing. It EATS your plug electrodes up.
This is why CD/elctronic ignitions are favored today.... Very high voltage of SHORT duration and low current. When they do wear and get bigger gaps, the HIGHER voltage can still jump the wider gap. Bob Urban ++++++++++++++++++++++++++++++++++++++++++++++++++ > > I wonder if the voltage matters? Maybe it's the current > capability that counts. Isn't the voltage only going > to rise to the point where the spark occurs? If there > is a plug connected, does the voltage really get anywhere > near 25,000 volts? I don't think it does. 5000 maybe? > > My arc welder doesn't have enough voltage to jump much > of a gap, but when it does, a really good high-current > arc results. On the other hand, if I shuffle my feet > across the floor, I can build up a hell of a charge > that can jump a quarter inch, but the current capability > is small, so the spark is barely visible. >
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