Sparkplugs Technical

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Spark plugs FAQ
A collection of frequently asked spark plug questions. Please check to see if your enquiry is answered in our FAQ before mailing for help.
About Iridium Spark plugs
Information about NGK Iridium IX, Iridium IX-LPG, Denso Iridium Power and Iridium Tough Plugs. A summary of technical information and the differences between the various Iridium plug types.
Technical glossary
A list of terms relating to the structure and build of sparkplugs
NGK Standard to Iridium cross reference

A list of NGK standard copper or platinum parts and their close Iridium IX equivalents.
Manufacturer's cross reference
A list of Bosch, Denso and Champion parts cross referenced to their NGK standard equivalent parts
NGK Symbol code
Detail of the NGK sparkplug part numbering systems. Can be used to identify plug characteristics when given a part number.
Champion Symbol Code
Detail of the Champion sparkplug part numbering system.
Denso Symbol Code
Detail of the Denso sparkplug part numbering systems
NGK Plug Cap Symbol Code
Detail of NGK's sparkplug cap part numbering system.
Sparkplug failure analysis
Examples of sparkplug failures which provide a visual diagnostic aid to identifying engine running problems.
Torque Settings

Important information regarding appropriate torque settings for plug installation

Gap Settings
Equivalent Metric <--> Imperial gap sizes. (Inches to mm and vice versa)
Tuning Considerations
Suggestions to help you identify the correct part for your modified or tuned vehicle. Nitrous Oxide, increased boost, remapping etc.

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