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. Low power engines - low heat range (or hot) spark plug, High power engines - high heat range (or cold) spark plug. 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. Product linkage to vehicles or equipment from this publication are considered under normal conditions of use, fitted by a professional. 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. 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. If you are unsure of the correct heat range to use, always start with a colder spark plug. 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. He also added that the Triumph 6 cylinder engine uses a 14mm with .750 reach. 2544 is the coldest plug in that plug family, and 2546 is the hotest. NGK Spark Plug Heat Rating. 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. 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. As a result, more heat stays in the ceramic firing end and less is dissipated to the engine. This web site and all data within is copyright. The setting of combustion deposits on the insulator tip is caused by an imperfect combustion due to … 2544 is the coldest plug in that plug family, and 2546 is the hotest. Note: This cross-reference is a guide only and may not be suitable for all vehicles. A spark plug’s heat range has no relationship to the actual voltage transferred though the spark plug. Ford | This is a video I made about spark plugs, their function, and mainly focused on the heat range. NGK platinum plug = BPR6EVX. 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 … Please refer to our application listings for full details. 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. 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. It must do this in a controlled manner that will: 1. 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. 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. The spark plug heat range has no relationship to the electrical energy transferred through the spark plug. No matter what type of spark plug you choose, an optimal heat rating for your vehicle’s engine is important. Total: £0.00, BMW | Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. 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: TecAlliance (who provide their TecDoc vehicle list and TecDoc data for matching of parts to vehicles). 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. The data shown here, particularly the database as a whole, shall not be copied. For security and data protection reasons It is highly recommended that you update your browser. The term heat range refers to the speed with which a plug can transfer heat from the combustion chamber to the engine head. If you need to know which spark plugs are suitable for your vehicle, simply use our handy spark & glow plug product lookup. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range … 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. Typically the heat range for NGK Spark Plugs varies from 2-11. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. Opie Oils, The Fuel Depot, Cardrew Industrial Estate, Redruth, Cornwall, TR15 1SS. … 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. 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. 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. Renault | The heat range numbering system used by spark plug manufacturers is not universal. 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. • HIGHER Heat Range • HOT PLUG Why is Heat Range Critical? 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. The Data User shall refrain from copying and disseminating the data or the database as a whole and / or from causing such acts to be carried out by third parties, without TecDoc's prior consent. Typically the heat range for NGK Spark Plugs varies from 2-11. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or … 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 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. Any violation shall constitute a copyright infringement and shall be subject to prosecution. This means the spark plug will heat up easily and reach its optimal operating temperature. Setting a Proper Gap. For example, a 7 heat range in Bosch is not the same as a 7 heat range in NGK nor the same in Champion. The heat range numbering system used by spark plug manufacturers is not universal. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. 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. And may not be suitable for your vehicle ’ s heat range is a measure of fast. 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