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

  • Non-Flanged

  • 1 Wire

  • 2 Wire

  • 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


  •    

        Not all spark plugs are created equal. Some spark plugs can improve performance, while others offer long life. Some can make your lawnmower easier to start, while others resist fouling. For most of the applications you look up at this site, whether its for a car, boat, lawnmower or generator, you will find the prices for a plug as low as $2 or as high as $12 (although we stock some hand made Japanese racing plugs which have a retail price of $100 per plug). So why spend $12 for a spark plug when a $2 plug will screw in and start your car? Well, to be honest, if you are just tuning up your car to pass smog so you can sell it, it isn’t cost effective to purchase the highest quality iridium or platinum plug. But if you are planning on keeping that car or the outboard motor you’re tuning up, the plug you choose can improve ease of starting, acceleration, fuel economy, as well as how soon you have to change them again. In short, there are horsepower and mileage improvements available from different spark plugs. To help you decide which plug is best for you we have categorized according to quality level and construction features. We have also explained and illustrated the differences in what may appear to be similar plugs. Whichever NGK part you’re looking for, NGK.com will become your source for NGK products. 97% of our orders, placed by 3 P.M. PST, ship the same day, with no back orders! That is why we’re the first choice for consumers and installers worldwide.
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