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. Most spark plug manufacturers recommend that the tip temperature remain between 500° C and 850° C. Heat ranges are designated by each spark plug manufacturer with a number. 2544 is the coldest plug in that plug family, and 2546 is the hotest. If a spark plugs temperature remains too low it can cause loss of ignition spark due to deposit build up on the firing end, which in turn will leave your engine struggling / down on power. A switch in heat range of the spark plug will change the tem-perature of the spark plug tip by 70-120 degrees. 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. As a result, more heat stays in the ceramic firing end and less is dissipated to the engine. Dexron | 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. Commonly, you can spot a low heat range (or hot) spark plug as it typically has a long thin insulator nose which can heat up quickly / easily and will not dissipate warmth to the metal shell as rapidly, where as a high heat range (or cold) spark plug has a short thick insulator nose which will transfer heat much easier. 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. Stay cool enough to avoid pre-ignition and/ or electrode destruction. If you are unsure of the correct heat range to use, always start with a colder spark plug. A colder heat range spark plug has an insulator design with a shorter heat flow path to the … Although not as damaging as having a too low rated plug, the effects can still be detrimental to your engine. The relationship between the spark plug temperature and vehicle speed and heat range is expressed with a graph like that in the figure. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. Total: £0.00, BMW | This web site and all data within is copyright. Can't find what you're looking for, or need some help? Randall Young provided he usual thorough explanation: For almost any given brand of plug, the letters determine all the plug physical dimensions, while the number is the heat range. 12 page guide by Champion Sparking Plug Co. Ltd.'s Competition Department, 1973. Just enter your vehicle details to get started! For example, a 14 heat range in Denso is not the same as a 14 heat range … 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. 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. The heat range of a spark plug is affected by the construction of the spark plug: the types of materials used, the length of insulator and the surface area of the plug exposed within the combustion chamber. 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. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. 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). A spark plug’s heat range has no relationship to the actual voltage transferred through the spark plug. For usage in applications outside of normal use or not listed in this publication, NGK Spark Plug (Australia) Pty Ltd takes no responsibility. But even a spark plug featuring a properly selected heat range, is influenced by the processes of fouling and self-cleaning of the insulator tip. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range … By continuing to browse the site you are agreeing to our use of cookies. Heat Range: (click for larger image) Heat Range = Ground Strap, the ground strap indicates the heat-range of the spark plug. To make things easier we've made this page to explain a few things, here you will find an explanation of heat ranges and how it can effect your engine, plus a cross reference table for heat ranges of some of the most common brands. Rather, the heat range is a measure of the spark plug’s ability to remove heat from the combustion chamber. The heat range numbering system used by spark plug manufacturers is not universal. Not a problem, just give us a call on 01209 202 949 or use our custom recommendation form and we'll be happy to look into the best possible choice for you. For security and data protection reasons It is highly recommended that you update your browser. Note: This cross-reference is a guide only and may not be suitable for all vehicles. 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). The choice of a proper heat range is very important. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. The heat range numbering system used by spark plug manufacturers is not universal. … A colder plug transfers heat faster while a hotter plug is slower. The copyright lives with Opie Oils, TecAlliance and the various part manufacturers who have supplied us their data for the purposes of listing products and matching products to vehicles, including: TecAlliance Statutory Notice: Cold plugs are used in High-Performance Engines, the heat range classification is basically the ability of the Spark Plug to dissipate heat from the … Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. The data shown here, particularly the database as a whole, shall not be copied. Spark Plug specification is subject to change without notice. What is a Spark Plugs Heat Range? 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. Ever wonder how spark plug heat ranges convert across brands? VW, Diesel System Additives & Cetane Boosters, Motorsport Fuel Octane Boosters / Fuel Treatments, High Viscosity Index + Detergency (HVI+D), Zinc & Ash Free, High Viscosity Index (ZAF & HVI), Screen Washer Pumps, Wiper Motors, Jets & Reservoirs, Camping Equipment Waterproofing & Protection, Using a spark plug with the correct heat range is critical for engine compatibility. 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. 2544 is the coldest plug in that plug family, and 2546 is the hotest. The heat range numbering system used by spark plug manufacturers is not universal. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. Spark Plug Heat Ranges Explained High heat range plugs are used in less powerful, Non Performance, Standard Engine types. Racing Heat Range and Tuning Guide. 2544 is the coldest plug in that plug family, and 2546 is the hotest. VW, BMW | In broad terms, spark plugs are often referred to as “hot plugs” or “cold plugs.” Got a modified or track car? Any violation shall constitute a copyright infringement and shall be subject to prosecution. 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. The heat range numbering system used by spark plug manufacturers is not universal. 2. 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. Typically the heat range for NGK Spark Plugs varies from 2-11. The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. 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. All applications, illustrations and technical information detailed on this site have been assembled based on the latest information available. If the plug is too cold, the plug will eventually foul and a misfire will occur. For example, a 7 heat range in Bosch is not the same as a 7 heat range in NGK nor the same in Champion. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. WE'RE OPEN FOR BUSINESS & DELIVERING TO YOUR DOORThe Opie Oils web site is trading as normal - the majority of deliveries are made within 1-3 working days. Low powered engines don't normally produce as much combustion warmth so won't heat up a plug as much or as rapidly as a high BHP vehicle, therefore the plugs have to be designed accordingly so they can reach and not exceed optimum operating temperatures. If you are using Internet Explorer 8 or 9, you can solve this problem by going to Tools > Internet Options > Advanced and ticking the 'Use TLS 1.2' option. Choosing the right heat range is crucial for high performance engines. Whether the plug is to be installed in a boat, lawnmower or race car, it has been found the optimum combustion chamber temperature for gasoline engines is between 500°C–850°C. A spark plug’s heat range has no relationship to the actual voltage transferred though the spark plug. This can be very damaging to your vehicles engine as the plug will overheat causing abnormal ignition firing (pre-ignition), that can lead to melting of the spark plug electrodes as well as piston seizure and erosion. 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. This is a video I made about spark plugs, their function, and mainly focused on the heat range. Renault | [more]. For normal use, the selection of a spark plug heat range is a balance between keeping the tip hot enough at idle to prevent fouling and cold enough at maximal power to prevent pre-ignition or engine knocking. This will not hurt the If you need to know which spark plugs are suitable for your vehicle, simply use our handy spark & glow plug product lookup. Spark plugs heat ranges can vary massively from plug to plug, and (rather frustratingly) can be recorded in a number of different ways, making comparison between brands rather hard. For example, a 2 heat range in Pulstar is not the same as a heat range 2 in Autolite nor the same in Bosch. The setting of combustion deposits on the insulator tip is caused by an imperfect combustion due to … It must do this in a controlled manner that will: 1. Typically the heat range for NGK Spark Plugs varies from 2-11. 0 Items 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 rating of a spark plug is the measure of its ability to transfer heat received from the firing end of the plug into the cylinder and engine cooling system. Product linkage to vehicles or equipment from this publication are considered under normal conditions of use, fitted by a professional. No matter what type of spark plug you choose, an optimal heat rating for your vehicle’s engine is important. Rather, the heat range is a measure of the spark plug’s ability to remove heat from the combustion chamber. 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. TecAlliance (who provide their TecDoc vehicle list and TecDoc data for matching of parts to vehicles). Until you've updated you may not be able to check out. NGK Spark Plug Heat Rating. The spark plug heat range has no relationship to the electrical energy transferred through the spark plug. Setting a Proper Gap. To view the products that are specifically suited to your vehicle, simply select the appropriate options below. 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. 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. Heat range is the speed at which a spark plug can transfer heat from the firing tip to the cylinder head water jacket and into the cooling system. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or … Low power engines - low heat range (or hot) spark plug, High power engines - high heat range (or cold) spark plug. This web site uses cookies. If it the heat range is too hot, your engine could experience detonation, pre-ignition, or power loss. This means the spark plug will heat up easily and reach its optimal operating temperature. When setting the spark plug's gap for installation, use the automobile manufacturer's recommended gap. Opie Oils, The Fuel Depot, Cardrew Industrial Estate, Redruth, Cornwall, TR15 1SS. Ford | Ford | 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. 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. The goal is to keep the cylinder temperature between 550*c and 800*c which is about 1020*f to 1470*f. This temperature range is cool enough to prevent knock and not melt the plug tip, but still hot enough to … • HIGHER Heat Range • HOT PLUG Why is Heat Range Critical? When dealing with Bosch spark plugs, the heat range is again designated by the number in the middle of the part code; a “W8DC” has a heat range of 8 and a “W6DC” a heat range of 6. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. The number (82 in this case) indicates the heat range of the spark plug, the higher the number the hotter the heat range (opposite of NGK and ND spark plugs). 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