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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

  • Melting

  • 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

  • CDI


    • 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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  • 3 Wire

  • 4 Wire

  • 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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    		Just as putting a board in front of a flashlight will block the light from everything behind that board, so the ground electrode can block a portion of the air fuel mixture from exposure to the spark. Thus a variety of ground electrode designs are available (fine wire ground, cut back ground, angled ground, Surface Air Gap, etc) all help to reduce shadowing.
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