Experts Say No Copper-Core Spark Plugs with Distributorless Ignitions

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Auto­lite engi­neers say back­yard mechan­ics and some tech­ni­cians may use cop­per-core spark plugs on dis­trib­u­tor­less igni­tion sys­tems (DIS). They say the plugs may work well in the begin­ning but are not suit­able for DIS needs and are like­ly to fail pre­ma­ture­ly. They rec­om­mend using dou­ble plat­inum or irid­i­um-enhanced plugs.