The heat range is defined as a plug’s ability to dissipate heat. The heat range numbering system used by spark plug manufacturers is not universal. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. NGK Spark Plugs pioneered the use of a copper cored electrode in 1958, which enables a spark plug to heat up quickly and also dissipate heat quickly giving an ultra wide heat range. NGK Spark Plug Numbering Systems Wondering what the numbers and letters on an NGK spark plug mean? Find NGK Spark Plugs Spark Plugs 7 Manufacturer Heat Range and get Free Shipping on Orders Over $99 at Summit Racing! LTD. All Rights Reserved |, Conditions when Spark Plug should be Changed. They range from COLD through MEDIUM; and HOT to EXTREMELY HOT. When a spark plug absorbs heat produced from combustion, the heat is transferred through the centre electrode and insulator nose to the metal shell, which then transfers the heat into the engine casing and circulating coolant. Rules for selecting the correct plug are to follow manufacturer’s specifications. Depending on the engine modifications you’ve made, you’ll need to take a few extra factors into consideration before settling on the right spark plugs. NGK Spark Plug Heat Rating. One of the most important—and most misunderstood—factors in choosing aftermarket spark plugs is the heat range. EXCEPTION: NGK Racing Plugs: (Any NGK plug that begins with the letter “R”) For NGK Racing Plugs, the heat range is located AFTER the hyphen. All applications, illustrations and technical information detailed on this site have been assembled based on the latest information available. 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. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Heat Range Reference. They don’t provide any more voltage to the spark plug tip! And remember : A higher heat-range number does not improve engine performance, it increases the plug's ability to dissipate heat. The relationship between the spark plug temperature and vehicle speed and heat range is expressed with a graph like that in the figure. 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. From the high-tech Ruthenium HX™ to the industry standard OE-style spark plugs, NGK drives the future of spark plug engineering. Racing Spark Plugs ; Typically the heat range for NGK Spark Plugs varies from 2-11. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. View full size version of NGK performance plug numbering chart. Conversely, a high heat range (or cold) spark plug has a short thick insulator nose which will dissipate heat much easier (above right). Heat Ranges When it comes to racing, choosing a spark plug within the correct heat range is vital. 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. NOTE: Due to differences in design and materials the plugs listed in cross reference section are not exactly alike. 2544 is the coldest plug in that plug family, and 2546 is the hotest. A colder plug would be # R5671A-11 (heat range 11), a hotter plug would be # R5671A-9 (heat range 9). It must do this in precise and controlled manner so the spark plug will: Stay cool enough to avoid pre-ignition and/or electrode destruction due to detonation. COLD MEDIUM HOT Racing Plug Number Old Racing Plug Number Champion NGK b6hs 4510 - - br6hix 3419 b7es 1111 - - br7eix 6664 b7hs 5110 - - br7hix 7067 b8es 2411 b8evx (disc'd) 7051 br8eix 5044 b8evx (disc'd) 7051 n/a - br8eix … NGK Heat Ranges - The larger the number after the … Selecting the Right Heat Range. 12 page guide by Champion Sparking Plug Co. Ltd.'s Competition Department, 1973. Don't just ask for a spark plug, insist on NGK. The world leader in spark plug technology for over 80 years. Please refer to our application listings for full details. While every precaution has been taken in the compilation of this information, NGK Spark Plug (Australia) Pty Ltd takes no responsibility for inaccuracies that may occur within it. All NGK Glow Plugs are manufactured to the highest level of quality to ensure quick and consistent starts NGK Resistor Caps The cover body is made of sturdy phenolic resin that endures high heat … To view the products that are specifically suited to your vehicle, simply select the appropriate options below. Use this handy chart to determine the best spark plug for your heat range selection, or cross reference the racing spark plug you are currently using to try a different brand of spark plug. NGK.com specializes in hard to find NGK products. A colder plug would be # R5671A-11 (heat range 11), a hotter plug would be # R5671A-9 (heat range 9). These factors include spark plug seat design, thread length and diameter, and reach. View full size version of NGK spark plug numbering chart. A hotter heat range spark plug has an insulator design with a longer heat flow path to the metal shell of the plug. ngk spark plug upgrade chart original plug stock no. It takes a high amount of precision to create spark plugs that perform their task well and are extremely resistant in doing so. Note: This cross-reference is a guide only and may not be suitable for all vehicles. The part number you have entered is unknown or incorrect. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. Racing Heat Range and Tuning Guide. The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. 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. NGK Spark Plugs (U.S.A.), Inc. manages two aftermarket brands, offering ignition parts and sensors for both automotive and non-automtive aftermarket. 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. 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. The spark plug temperature remains too low and causes deposits to build up on the firing end; the deposits provide an electrical leakage path that gives rise to a reduction of spark. In reality, most “racing” spark plugs are just colder heat ranges of the street versions of the spark plug. It must do this in a precise and controlled manner so the spark plug will: Stay cool enough to avoid pre-ignition and/or electrode destruction due to detonation. NGK spark plugs push the limits of performance and innovation, bringing the most advanced technology to today’s high-efficiency engines. Heat Range Cross Reference Table | … Heat Range Cross Reference Chart: Ever wonder how spark plug heat ranges convert across brands? We are not NGK Spark Plugs USA. Introduction. 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. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. The spark plug works as a heat exchanger by pulling unwanted thermal energy away from the combustion chamber, and transferring the heat to the engine’s cooling system. Autolite engineers have developed plugs in many heat ranges to suit all engine applications. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. A low heat range (or hot) spark plug typically has a long thin insulator nose which will heat up easily however will not dissipate readily to the metal shell (above left). 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. As a result, more heat stays in the ceramic firing end and less is … Some NGK Racing Plugs are also available in half heat ranges. Several factors influence the heat range of a spark plug, although typically the insulator nose design provides an indication of the heat range of a spark plug. Call us at 713-459-6977. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. 2544 is the coldest plug in that plug family, and 2546 is the hotest. 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. 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 term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or whether it provides resistance to heating up (cold). It is essential to use a spark plug that fits a specific engine and its conditions of use. Product linkage to vehicles or equipment from this publication are considered under normal conditions of use, fitted by a professional. These NGK spark plug charts explain how NGK's numbering system works. To contact them, click here. Typically the heat range for NGK Spark Plugs varies from 2-11. For example, R6120-85 has a 8.5 heat range and R6120-105 has a 10.5 heat range. platinum upgrade stock no. The spark plug firing end temperature must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. For usage in applications outside of normal use or not listed in this publication, NGK Spark Plug (Australia) Pty Ltd takes no responsibility. Numbering system used by spark plug brands cross-reference is a guide only and may be! Thread length and diameter, and reach assembled based on the latest technology in spark brands! Task well and are extremely resistant in doing so prevent fouling from cold through MEDIUM ; and to. 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