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Originally Posted by Mougoo
...I didnt change the cap and rotor yet due to the fact every fall and spring I polish the contacts using a dremel with a fine wire wheel.(makes it last longer and causes great conductivity)...
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It's not just the corrosion that reduces conductivity, but also wear of the cap and rotor. When the gap between rotor and distributor starts growing, the energy required to jump this larger gap is taken away from the spark plug.... not a big deal on a healthy ignition system, but considering the great lengths people go to increase the spark energy at the spark plug, this merits consideration.