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From what i understand the hotter the spark the quicker the flame front in the combustion chamber and therefore more power and fe because the ecu has to reduce fuel to compensate for the increased burn speed(the engine can't handle an instant explosion to much force on the piston/rod and it can only move so fast) And the fine tip'd iridium spark plugs are better i think because they allow more vapor around them to increase the burn rate also. You might get better results with a higher voltage coil.
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