Manufactures Proprietary Terms
  • Autolite HT Plugs


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  • Test Results and Media
  • Autolite's spark plug change walk-through

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  • Displacement Conversion Chart


  • Center Electrodes
  • Iridium

  • Fine wire

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  • Necked down


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  • Sidewire Technology

  • Cut back ground

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  • Resistor


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  • Plug Problems
  • Breakage

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  • Plug Properties
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  • DIS


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  • Manufacturer's Numbering System
  • Autolite


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    Necked down center electrode
    Necked down center electrode

    Traditional center electrode
    Traditional center electrode

    Necked down center electrodes operate on the same principles as fine wire electrodes. These will typically perform better than a traditional plug. There are two reasons for this. First is because a smaller center electrode requires less voltage to jump the gap. This means fewer misfires, which will be seen in higher mileage and more horsepower. The second reason is, a smaller center electrode reduces quenching.
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