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Re: Smaller Plug Gap vs. Larger..Pros and Cons..?
Expanding upon Curtis' response...you need 2 components to make a good spark. a) a good firing voltage and b) a good spark line after it fires. The firing voltage is controlled by the gap, since it is the widest air gap in the system (or better be). The firing line is the duration of the spark. You only get so much voltage as the coil fires. By widening the gap, you use more voltage to fire the plug and thus shorten the duration of the spark. If you shorten the duration too much, you'll have incomplete burns. Too little gap results in poor ignition as Curtis mentioned. You need the scope mentioned to see the difference. Keep in mind that the spark WILL find a path to ground every time. If not across the plug, somewhere prior to it.
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