Manufactures Proprietary Terms
  • Champion Stainless Steel Marine

  • Champion PowerSport

  • Truck Plug

  • EZ Start

  • Autolite HT Plugs

  • Co-Gen


  • Racing Plugs
  • NGK Racing Plug Recommendations

  • Choosing A Racing Plug

  • Installation Guide

  • 2007 NGK Racing Plug Catalog

  • Autolite Racing Charts

  • NGK U.S. Racing Plug Chart


  • Special Plug Features
  • Bi-Hex


  • Test Results and Media
  • SRT-4 Dyno Results

  • Pulstar Dyno Results

  • NGK Dyno Results

  • E3 in the news

  • Pulstar Plugs in the Media

  • Autolite's spark plug change walk-through

  • Autolite's tune-up safety tips


  • Conversion Charts
  • Displacement Conversion Chart

  • DENSO Aftermarket Performance Cylinder Head Application Chart

  • NGK Racing Wires

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


  • Center Electrodes
  • Fine wire

  • Ultra-fine

  • Tapered point

  • Taper cut

  • Necked down

  • V-Power


  • Ground Electrodes
  • V-trimmed

  • Sidewire Technology

  • Double Fine Electrode

  • Surface Air Gap

  • Binary

  • Mono

  • trapezoid

  • Cut back ground

  • Fine wire ground

  • Wedge shaped ground

  • Inverted V-tip

  • Tapered cut

  • Trimmed side electrode

  • Angled ground strap

  • U-groove

  • Multi-ground

  • Supplementary gap

  • Intermittent discharge

  • Semi-surface discharge

  • Surface discharge


  • Resistor Types
  • Resistor

  • Inductive resistor

  • Q-type suppressor

  • CDI resistor


  • Precious Metal Types
  • Yttrium

  • Platinum

  • Gold Palladium

  • Iridium


  • Plug Problems
  • Doughnut

  • Lead Erosion

  • Breakage

  • Lead Fouling

  • Shadowing

  • Fouling

  • Bridging

  • Deposits

  • Pre-ignition

  • Flashover

  • Quenching


  • Plug Properties
  • Thread

  • Reach

  • Hex

  • Terminal

  • Seat

  • Center electrode

  • Ground electrode

  • Copper core

  • Diameter


  • Ignition Anachronism
  • Radio Frequency Interference

  • RFI

  • ISO

  • JIS

  • Distributorless Ignition System

  • DIS

  • Capacitor Discharged Ignition

  • CDI


  • Glow Plugs
  • Sheathed Glow Plug

  • Preheating

  • After glow

  • Quick-start type

  • Standard sheathed type

  • QGS sheathed type

  • Self-regulating sheathed type

  • NGK Glow Plug Chart

  • Glow Plug Fault Diagnosis

  • Ceramic Glow Plug

  • Twin Coil Glow Plug

  • Single Glow Plug Design

  • Long Post Heating Glow Plug


  • Oxygen Sensors
  • Planar

  • Air Fuel Sensor

  • Signal

  • Flanged

  • Non-Flanged

  • 1 Wire

  • 2 Wire

  • 3 Wire

  • 4 Wire

  • stoichiometric

  • air/fuel ratio

  • Cross Count

  • Lambda sensor

  • Titania

  • Universal Oxygen Sensor

  • Zirconia

  • Wide Band Oxygen Sensor

  • 5 Wire Oxygen Sensor

  • Reading old oxygen sensors

  • Oxygen Sensor Diagnostic Testing

  • OE Identical Oxygen Sensor Installation Instructions

  • Universal O2 Sensor Installation Instructions


  • Manufacturer's Numbering System
  • NGK

  • Champion

  • Denso

  • Autolite

  • Splitfire

  • Bosch


  • Post Release Articles
  • K&N HP Gains - 1996-2007 Lotus Elise/Exige

  • K&N HP Gains - 1996-2008 Ford Mustang GT

  • K&N HP Gains - 2004-2008 Scion xB

  • K&N HP Gains - 2005-2007 Chevy Corvette

  • K&N HP Gains - 2005-2008 Chrysler 300C

  • K&N HP Gains - 2007 Hummer H3

  • K&N HP Gains - 2007 Nissan 350Z

  • K&N HP Gains - 2007 Scion tC

  • K&N HP Gains - 2007 Shelby Ford Mustang GT 500

  • K&N HP Gains - 2007-2008 Toyota Tundra

  • K&N HP Gains - Ford F-Series Trucks

  • K&N HP Gains - GM Diesel

  • K&N HP Gains - Honda Fit Performance Add-Ons

  • K&N New Product Release - 2005-2008 Mercedes Diesel

  • K&N New Product Release - 2007 Mini Cooper S

  • K&N New Product Release - 2007-2008 Mercedes AMG

  • K&N New Product Release - 2008 Hummer H3

  • K&N New Product Release - Lexus IS220

  • K&N New Product Release - Nissan Sentra 2.5L L4

  • K&N New Product Release - 2006-2008 BMW 3-Series

  •    

        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, Denso, Bosch, Champion, Autolite or Splitfire, Pulstar, or E-3 you’re looking for, SparkPlugs.com will become your source for spark plugs. 95% of our orders, placed by 3 P.M. PST, ship the same day, with no backorders! That is why we’re the first choice for consumers and installers worldwide.
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    Sun City, CA 92586
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