Ngk Racing Spark Plug Heat Range Chart

As a result more heat stays in the ceramic firing end and less is dissipated to the engine.

Ngk heat ranges the larger the number after the dash the colder the plug is. The heat rating is a measure of the amount of heat dissipation the heat range of a spark plug is the range in which the plug works well thermally. Well below you will find a heat range cross reference chart that shows comparisons between 5 major brands of spark plugs. The spark plug heat range has no relationship to the electrical energy transferred through the spark plug.

They don t provide any more voltage to the spark plug tip. Some manufacturers numbering systems are opposite the other for champion autolite and bosch the higher the number the hotter the plug. Lower numbers indicate a hotter type higher numbers indicate a colder type. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat.

The heat rating of each ngk spark plug is indicated by a number. However according to an autolite reference chart autolite 86 has the same heat range as 2244 and autolite 303 is a hotter plug than 2974. A hotter heat range spark plug has an insulator design with a longer heat flow path to the metal shell of the plug. The heat rating of each ngk spark plug is indicated by a number.

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It can be a pain when you need a new spark plug but you don t know how your current heat range translate to a new brand. Typically the heat range for ngk spark plugs varies from 2 11. The heat range numbering system used by spark plug manufacturers is not universal. Ever wonder how spark plug heat ranges convert across brands.

Example a r5671a 7 a good street strip plug is a cold plug where a r5671a 10 is a very cold plug used for large 400hp and up nitrous and other power adder applications. Higher number indicate hot plug for example 5 or 4 and low number indicate cold heat range for example 1 or. In reality most racing spark plugs are just colder heat ranges of the street versions of the spark plug. This number indicates the thermal characteristics of a spark plug or how hot or cold a spark plug is.

The heat range of a spark plug is the range in which the plug works well thermally. The term hot cold is commonly used to describe whether a spark plug heats up easily. Therefore it is impossible to chart an autolite heat range hierarchy let alone a standardized comparison to other spark plug brands. Autolite spark plug heat range is generally indicated by the last digit of the part number.

Their internal construction is no different in ngk s case as all of our spark plugs must conform to the same level of quality controls than most standard spark plugs. For example a 10 heat range in champion is not the same as a 10 heat range in ngk nor the same in autolite.