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The energy for the spark is stored in the ignition coil.
As I understand it, the spark lasts longer if the gap is smaller. And if the gap is enlarged the voltage between the gap gets higher before the spark jumps and the spark duration is shorter.
I think the spark energy is the same in both cases.
Once I verified this with a scopemeter. I had different gaps in different cylinders and I could see that the gap affected to spark burn time.
I'd also like to know what affect it has to FE
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