NGK Spark Plug Numbering Systems Wondering what the numbers and letters on an NGK spark plug mean? Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. To view the products that are specifically suited to your vehicle, simply select the appropriate options below. It takes a high amount of precision to create spark plugs that perform their task well and are extremely resistant in doing so. However, sparks don’t just simply ignite. Racing Heat Range and Tuning Guide. 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). The heat range numbering system used by spark plug manufacturers is not universal. Don't just ask for a spark plug, insist on NGK. Part Number: NGK-93400 Not Yet Reviewed Heat Range Cross Reference Table | … We offer the latest technology in spark plug design & performance that can help you improve your engine performance & fuel economy. We are not NGK Spark Plugs USA. 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. These are displayed as a 2 or 3 digit number after the hyphen. The world leader in spark plug technology for over 80 years. For usage in applications outside of normal use or not listed in this publication, NGK Spark Plug (Australia) Pty Ltd takes no responsibility. 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. 2544 is the coldest plug in that plug family, and 2546 is the hotest. They don’t provide any more voltage to the spark plug tip! 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 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. 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. Spark Plug specification is subject to change without notice. The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. Generally, low power engines such as lawn mowers don’t produce a large amount of heat, hence use a low heat range (or hot) spark plug such as a 4 heat range. A colder plug would be # R5671A-11 (heat range 11), a hotter plug would be # R5671A-9 (heat range 9). 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 … Autolite engineers have developed plugs in many heat ranges to suit all engine applications. LTD. All Rights Reserved |, Conditions when Spark Plug should be Changed. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. NOTE: Due to differences in design and materials the plugs listed in cross reference section are not exactly alike. 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. For example, R6120-85 has a 8.5 heat range and R6120-105 has a 10.5 heat range. This means the spark plug will heat up easily and reach its optimal operating temperature. A colder plug would be # R5671A-11 (heat range 11), a hotter plug would be # R5671A-9 (heat range 9). In identical spark plug types, the difference from one full heat range to the next is the ability to remove 70°C to 100°C from the combustion chamber. 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. 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. 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. ngk spark plug upgrade chart original plug stock no. 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. View full size version of NGK spark plug numbering chart. Find NGK Spark Plugs Spark Plugs 7 Manufacturer Heat Range and get Free Shipping on Orders Over $99 at Summit Racing! 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 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. Product linkage to vehicles or equipment from this publication are considered under normal conditions of use, fitted by a professional. 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 … 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. 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. 502, Fifth Floor, JMD Pacific Square, Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. 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. 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. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. 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. Racing Spark Plugs ; Typically the heat range for NGK Spark Plugs varies from 2-11. An IATF 16949:2016 & ISO 9001:2015 Certified, An ISO 14001:2015 & ISO 45001:2018 certified Co. The spark plug firing end temperature must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. 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. And remember : A higher heat-range number does not improve engine performance, it increases the plug's ability to dissipate heat. Racing Spark Plugs ; Typically the heat range for NGK Spark Plugs varies from 2-11. Heat Range Reference. To contact them, click here. NGK.com specializes in hard to find NGK products. 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. Example: R5671A-10 has a heat range of 10. COLD MEDIUM HOT Racing Plug Number Old Racing Plug Number Champion NGK Selecting the Right Heat Range. Example: R5671A-10 has a heat range of 10. Call us at 713-459-6977. The part number you have entered is unknown or incorrect. Use, fitted by a professional the measure of how fast the spark plug technology for over 80 years over... ” spark plugs plug has an insulator design with a longer heat flow path to the spark plug range. Developed plugs in many heat ranges When it comes to Racing, Tapered Seat, 14mm Thread, 25mm,... A “ heat range is expressed with a graph like that in the figure Typically heat... Find NGK spark plugs varies from 2-11 that plug family, and reach to... Of 10 and 2546 is the measure of how fast the spark plug fits. Appear to be the same but have a different heat range hierarchy, let alone a comparison... Plugs ( U.S.A. ), Inc. manages two aftermarket brands, offering ignition and... 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