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Racing Plugs
  • NGK Racing Plug Recommendations

  • Choosing A Racing Plug

  • Installation Guide

  • 2007 NGK Racing Plug Catalog

  • NGK U.S. Racing Plug Chart


    • Special Plug Features
  • Bi-Hex


    • Conversion Charts
  • Displacement Conversion Chart

  • NGK Racing Wires

  • Heat Range Interchange (NGK-Denso-Champion- Bosch)


    • Center Electrodes
  • Fine wire

  • Ultra-fine

  • Taper cut

  • V-Power


    • Ground Electrodes
  • Double Fine Electrode

  • trapezoid

  • Cut back ground

  • Tapered cut

  • Angled ground strap

  • Multi-ground

  • Supplementary gap

  • Intermittent discharge

  • Semi-surface discharge

  • Surface discharge


    • Resistor Types
  • Resistor

  • Inductive resistor


    • Precious Metal Types
  • Platinum

  • Gold palladium

  • Iridium


    • Plug Problems
  • Breakage

  • Erosion

  • Lead Erosion

  • Lead Fouling

  • Normal Plug Wear

  • Overheating

  • Shadowing

  • Corona Stain

  • Fouling

  • Bridging

  • Deposits

  • Pre-ignition

  • Flashover

  • Quenching


    • Plug Properties
  • Thread

  • Reach

  • Hex

  • Terminal

  • Seat

  • Center electrode

  • Ground electrode

  • Copper core

  • Diameter


    • Ignition Anachronism
  • Wasted Spark Ignition

  • Radio Frequency Interference

  • RFI

  • ISO

  • JIS

  • Distributorless Ignition System

  • DIS

  • Capacitor Discharged Ignition


    • Glow Plugs
  • Quick-start type

  • Standard sheathed type

  • QGS sheathed type

  • Self-regulating sheathed type

  • After Glow

  • Ceramic Glow Plugs


    • Oxygen Sensors
  • Signal

  • Planar

  • Air Fuel Sensor

  • Flanged

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  • 1 Wire

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  • Cross Count

  • stoichiometric

  • air/fuel ratio

  • Lambda Sensor

  • Titania

  • Universal Oxygen Sensor

  • Zirconia

  • Wide Band Oxygen Sensor

  • 5 Wire Oxygen Sensor

  • Reading old oxygen sensors

  • Oxygen Sensor Diagnostic Testing

  • NTK OE Identical Oxygen Sensor Installation Instructions

  • NTK Universal O2 Sensor Installation Instructions


    • Manufacturer's Numbering System
  • NGK


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    		Surface and semi-surface discharge firing tips are less sensitive to voltage requirement increases due to gap growth(wear). Note the concave cut on the ground electrodes for even Gap growth (wear). In addition, this type of construction aids in burning away the carbon which can act as a bridge between the center electrode and plug shell. This bridging can cause plug misfire.
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