Can't find what you're looking for, or need some help? 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. If it the heat range is too hot, your engine could experience detonation, pre-ignition, or power loss. Just enter your vehicle details to get started! Opie Oils, The Fuel Depot, Cardrew Industrial Estate, Redruth, Cornwall, TR15 1SS. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range … 2544 is the coldest plug in that plug family, and 2546 is the hotest. The heat range of a spark plug is the range in which the plug works well thermally. Product linkage to vehicles or equipment from this publication are considered under normal conditions of use, fitted by a professional. Heat Range: (click for larger image) Heat Range = Ground Strap, the ground strap indicates the heat-range of the spark plug. Racing Heat Range and Tuning Guide. 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. Opie Oils has a simple lookup that can find the correct spark plugs for your vehicle in seconds. A spark plug’s heat range has no relationship to the actual voltage transferred though 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. As a result, more heat stays in the ceramic firing end and less is dissipated to the engine. It must do this in a controlled manner that will: 1. Got a modified or track car? 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. Introduction. Dexron | 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 each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. 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 heat range numbering system used by spark plug manufacturers is not universal. 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. The term heat range refers to the speed with which a plug can transfer heat from the combustion chamber to the engine head. 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 is a video I made about spark plugs, their function, and mainly focused on the heat range. Well, below you will find a “heat range cross reference chart” that shows comparisons between 5 major brands of spark plugs. 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. A switch in heat range of the spark plug will change the tem-perature of the spark plug tip by 70-120 degrees. 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. Ford | VW, BMW | The spark plug heat range has no relationship to the electrical energy transferred through the spark plug. Renault | 2544 is the coldest plug in that plug family, and 2546 is the hotest. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. All applications, illustrations and technical information detailed on this site have been assembled based on the latest information available. 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. NGK platinum plug = BPR6EVX. Spark Plug Heat Ranges Explained High heat range plugs are used in less powerful, Non Performance, Standard Engine types. Spark Plug specification is subject to change without notice. Setting a Proper Gap. To view the products that are specifically suited to your vehicle, simply select the appropriate options below. Run hot enough to burn off combustion Typically the heat range for NGK Spark Plugs varies from 2-11. 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. 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. 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 relationship between the spark plug temperature and vehicle speed and heat range is expressed with a graph like that in the figure. For example, a 2 heat range in Pulstar is not the same as a heat range 2 in Autolite nor the same in Bosch. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. This web site uses cookies. Until you've updated you may not be able to check out. 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 Any violation shall constitute a copyright infringement and shall be subject to prosecution. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. 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 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. 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. 0 Items For example, a 7 heat range in Bosch is not the same as a 7 heat range in NGK nor the same in Champion. [more]. The heat range numbering system used by spark plug manufacturers is not universal. 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. The data shown here, particularly the database as a whole, shall not be copied. He also added that the Triumph 6 cylinder engine uses a 14mm with .750 reach. 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. Ford | NGK Spark Plug Heat Rating. 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. Low power engines - low heat range (or hot) spark plug, High power engines - high heat range (or cold) spark plug. Generally, if a plug has a hotter heat rating it's simply not as thermally resistant as a cooler graded plug. 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. The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. 12 page guide by Champion Sparking Plug Co. Ltd.'s Competition Department, 1973. … 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. 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. 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). 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. 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. What is a Spark Plugs Heat Range? If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. If you need to know which spark plugs are suitable for your vehicle, simply use our handy spark & glow plug product lookup. 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