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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

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  • 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

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  • Plug Problems
  • Breakage

  • Erosion

  • Lead Erosion

  • Lead Fouling

  • Melting

  • Normal Plug Wear

  • Overheating

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  • Deposits

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  • Plug Properties
  • Thread

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  • Ignition Anachronism
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  • Glow Plugs
  • Quick-start type

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  • After Glow

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  • Oxygen Sensors
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  • Cross Count

  • stoichiometric

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  • Lambda Sensor

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  • Universal Oxygen Sensor

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  • 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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    Performance Chart
    Performance Chart

    Voltage and Temerature
    Voltage and Temerature

    Glow Plug
    Glow Plug

    A QGS sheathed glow plug heats up extremely quickly. However, a special QGS control device is needed. There are two different, non-interchangeable types of quick-start glow plugs. The first type has one heating coil with a low resistance which is designed for an extremely high current flow. The second type has both a heating and a control coil. This guarantees that the resistance increases with temperature and therefore provides a certain degree of temperature control. These glow plugs have very short preheating times and improve the cold start performance. Safety information: If the voltage is generated for too long and the temperature is too high, the glow plugs can melt and crack. Therefore the control device or relay must either reduce or completely switch off the current flow as soon as a temperature of about 900°C is reached.
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