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Spark Plugs: Fact and Fiction

High-Performance Spark Plug Selection Can Be Boiled Down To Four Basic Steps

Photography by Marlan Davis

Car Craft, February, 2009

4

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  SplitFire’s patented V-shaped ground electrode enhances combustion efficiency. Becaus

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  Most domestic engines use 14mm plug threads with reaches (lengths), as measured from the e

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  The “cap-end” (rear portion) of most modern plugs has been lengthened to provide

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  Once the domain of weird surface-gap plugs, some Top Fuel dragsters have switched to a Cha

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  A projected-nose plug (right) yields a broader heat range than a regular-gap plug (left),

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  Wide gaps increase power and mileage if the ignition system is up to the job. Generally, s

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  Compare the cool Champion RC12YC projected street plug (left) to the icicle C57HCX NASCAR

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  If your application originally called for 3/4-inch