With modern sophisticated engines, new ceramics and superior alloys for spark plugs, the job of selecting a plug for a specific engine has become more critical. 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. In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. The part number you have entered is unknown or incorrect. The heat range is defined as a plug’s ability to dissipate heat. High performance engines on the other hand produce a large amount of heat, hence a high heat range (or cold) spark plug such as a 10 heat range needs to be used to resist the heat developed by the engine. Heat Ranges When it comes to racing, choosing a spark plug within the correct heat range is vital. Note: This cross-reference is a guide only and may not be suitable for all vehicles. 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. However, sparks don’t just simply ignite. These NGK spark plug charts explain how NGK's numbering system works. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. It takes a high amount of precision to create spark plugs that perform their task well and are extremely resistant in doing so. 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. Selecting an incorrect heat range for your application may cause fouling of the spark plug if too cold, or possibly severe catastrophic engine failure if too hot for the application. Example: R5671A-10 has a heat range of 10. We are not NGK Spark Plugs USA. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. This means the spark plug will heat up easily and reach its optimal operating temperature. Heat range - It's important to choose a racing plug with a heat range that keeps the electrode at an optimum temperature under even the most torturous racing conditions. Part Number: NGK-93400 Not Yet Reviewed NGK.com specializes in hard to find NGK products. In reality, most “racing” spark plugs are just colder heat ranges of the street versions of the spark plug. Spark Plug, Racing, Tapered Seat, 14mm Thread, 25mm Reach, Heat Range 8, With Resistor, Each. An IATF 16949:2016 & ISO 9001:2015 Certified, An ISO 14001:2015 & ISO 45001:2018 certified Co. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. View full size version of NGK spark plug numbering chart. Call us at 713-459-6977. The heat range numbering system used by spark plug manufacturers is not universal. The spark plug temperature remains too low and causes deposits to build up on the firing end; the deposits offer an electrical leakage path that gives rise to loss of sparks. As a result, more heat stays in the ceramic firing end and less is … It is important to remember that spark plugs do not create heat, they can only remove heat. Spark Plug specification is subject to change without notice. Some NGK Racing Plugs are also available in half heat ranges. The spark plug temperature rises too high and induces abnormal combustion (pre-ignition): this leads to melting of the spark plug electrodes as well as piston seizure and erosion. NGK Spark Plugs (U.S.A.), Inc. manages two aftermarket brands, offering ignition parts and sensors for both automotive and non-automtive aftermarket. 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