Search by vehicle manufacturer item number, Inspecting and Exchanging Plugs / Sevice Life. 0 Items NGK spark plugs use a heat range index ranging from 2 to 12 with 2 being the hottest spark plug and 12 being the coldest. Starting with part # RCJ7Y (heat range 7), a colder plug would be # RCJ6Y (heat range 6), a hotter plug would be # RCJ8Y (heat range 8). For security and data protection reasons It is highly recommended that you update your browser. 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. There are restrictions on the temperatures at which spark plugs can be used: the lower limit is the self-cleaning temperature and the upper limit is the pre-ignition temperature.A spark plug only … Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug … 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. Ford | Heat Range Reference. This web site and all data within is copyright. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Follow this link for more information on Determining Correct Spark Plug Heat Range. platinum upgrade stock no. Opie Oils, The Fuel Depot, Cardrew Industrial Estate, Redruth, Cornwall, TR15 1SS, revised opening times and delivery schedules. Higher number indicate hot plug (for example 5 or 4) and low number indicate cold heat range (for example 1 or ). Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. Ever wonder how spark plug heat ranges convert across 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. Conversely, a high heat range (or cold) spark plug has a short thick insulator nose which will dissipate heat much easier (above right). The spark plug heat range has no relationship to the electrical energy transferred through the spark plug. 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: Until you've updated you may not be able to check out. HAPPY NEW YEAR! Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug … 2544 is the coldest plug in that plug family, and 2546 is the hotest. That is why it is necessary to select spark plugs with the appropriate heat range for the engine characteristics, running conditions, etc. The heat range of a spark plug is its ability to transfer heat from the combustion chamber to the cylinder head. 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. Well, below you will find a “heat range cross reference chart” that shows comparisons between 5 major brands of spark plugs. Generally, if a plug has a hotter heat rating it's simply not as thermally resistant as a cooler graded plug. This web site uses cookies. Got a modified or track car? iridium upgrade stock no. Low heat range spark plugs have center electrode temperatures that rise easily and even at low-speed, they easily reach the self-cleaning temperature, so carbon is not deposited easily on the insulator section. Can't find what you're looking for, or need some help? Too hot of a plug will cause preignition, engine knock, and finally detonation. 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. Ford | The heat that the electrode section of the spark plug receives due to combustion is dispersed through the path in the figure. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug … Explanation of a Spark Plugs Heat Range from NGK Spark Plugs USA. 2. Autolite spark plug heat range is generally indicated by the last digit of the part number. When the heat rating is too high: 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 … The relationship between the spark plug temperature and vehicle speed and heat range is expressed with a graph like that in the figure. Copyright ©2018 DENSO CORPORATION. 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. 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 heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder … Just enter your vehicle details to get started! Also, since the heat release path from the insulator leg section to the housing is long, heat dispersal is low and the temperature of the center electrode rises easily. The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. • HIGHER Heat Range • HOT PLUG Why is Heat Range Critical? The world leader in spark plug technology for over 80 years. Low heat range plugs have long insulator leg sections and the surface area affected by the flame and the gas pocket capacity are large. 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. The optimal temperature to remove carbon deposits from the tip of the spark plug is 450º - 500ºC. 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. On the other hand, high heat range spark plugs have center electrode temperatures that do not rise easily, so they are unlikely to reach the pre-ignition temperature even at high speed. Also since the heat release path from the insulator leg section to the housing is short, heat dispersal is high and the temperature of the center electrode does not rise easily. All rights reserved. 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. Therefore, the insulation between the insulator and the housing falls, electricity leaks occurs, the spark across the gap is incomplete, causes ignition failures. 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. Choosing the right heat range is crucial for high performance engines. Run hot enough to burn off combustion deposits that … This is largely determined by the temperature of the gas inside the combustion chamber and the spark plug design. Heat Range Cross Reference Table | Technical Specs Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug … 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. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon … Denso: Denso indicates the heat range in the middle of the plug number. [15] Heat Range - The middle number indicates the heat range of the spark plug, the higher the number the hotter the heat range. Spark Plug Heat Range Cross Reference . - Chris LaCouture, E3 Spark Plugs Engineer As a result, more heat stays in the ceramic firing end and less is dissipated to the engine. Getting the correct heat range when you purchase new performance plugs for your vehicle is critical! Resistor Stock No. For example, SK20PR-A11 has a heat range of 20. The letters refer to the center electrode material, projection … The difference between one heat range to the next represents the … Autolite ® Spark Plug Heat Range Chart Tabla de grados térmicos de bujías Autolite ® A B C D E F G H I J. THREAD IRIDIum XP Too cold and the spark plug will cold foul resulting in an engine misfire. Conversely, a high heat range (or cold) spark plug has a short thick insulator nose which will dissipate heat much easier (above right). If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon … Opie Oils Limited (all other content, including but not limited to lubricant advice & recommendations). We offer the latest technology in spark plug design & performance that can help you improve your engine performance & fuel economy. Opie Oils has a simple lookup that can find the correct spark plugs for your vehicle in seconds. 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. 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. Therefore, this type of spark plug is generally used for high speed, high output engines. Notes. [YC] Firing End Design - The letters after the heat rating indicates a special spark plug construction feature called the firing end design. However, the Bosch rating system is the opposite of NGK’s in that a low number represents a colder plug (2 is the coolest) and a … Don't just ask for a spark plug, insist on NGK. 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. By continuing to browse the site you are agreeing to our use of cookies. When the center electrode temperature is 500°C or lower, free carbon generated when the fuel does not combust completely is deposited on the surface of the insulator. Stay cool enough to avoid pre-ignition and/ or electrode destruction. It must do this in a controlled manner that will: 1. The data shown here, particularly the database as a whole, shall not be copied. NOTE: Due to differences in design and materials the plugs listed in cross reference section are … 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. Although not as damaging as having a too low rated plug, the effects can still be detrimental to your engine. A hotter heat range spark plug has an insulator design with a longer heat flow path to the metal shell of the 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. Explanation of a Spark Plugs Heat Range from NGK Spark Plugs USA. 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 plug upgrade chart original plug stock no. Heat range is the measure of how fast the spark plug tip dissipates combustion heat. 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. 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. Well, below you will find a “heat range cross reference chart” that shows comparisons between 5 major brands of spark … March 2014. Total: £0.00, BMW | pgr7a 3200 n/a - igr7a 6687 plfr6a-11 7654 n/a - ilfr6t11 4904 pltr6a-10g 3587 n/a - iltr6a-13g * 3789 plzfr6a-11s 5987 n/a - ilzfr6d11 1208 plzkbr7a-g (disc'd) 5843 n/a - ilzkbr7b8dg 95770 A = Thread Diameter = 14 mm G = Reach = .708" Conical Seat S = Plug Characteristic = Suppressor (Carbon) F = Plug Characteristic = Conical Seat 3 = Heat Range = Cold (Stock) 2 = Tip Configuration = Extended (Power) Tip C = Plug Characteristic = Copper Core Electrode The heat range measurement is determined by several factors; the length of the ceramic centre insulator nose … This is most commonly done by changing the contact area of the porcelain insulator nose to the shell … Low power engines - low heat range (or hot) spark plug, High power engines - high heat range (or cold) spark plug. 2544 is the coldest plug in that plug family, and 2546 is the hotest. In these instances, a colder plug may be needed. It is the measure of how fast the spark plug tip dissipates combustion heat. 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 heat transfer pulls heat out of the combustion chamber and at the same time away from the spark plug tip. The heat range is determined by the insulator nose length and its ability to absorb and transfer combustion heat, the gas volume around the insulator nose, and the materials/construction of the center electrode and porcelain insulator.In identical spark plug types, the difference from one heat range to the next is the ability to … A spark plug’s heat range has no relationship to the actual voltage transferred though the spark plug. The heat range of a spark plug is the range in which the plug works well thermally. 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. This temperature of 500°C is called the self-cleaning temperature because above this temperature the carbon is naturally burnt away completely by combustion. Renault | For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the … Spark plugs with a high degree of heat dispersal are called high heat range (cold type) and those with a low degree of heat dispersal are called low heat range (hot type). 2544 is the coldest plug in that plug family, and 2546 is the hotest. Choosing the right heat range is crucial for high performance engines. Non-Resistor Stock NO. The degree to which a spark plug disperses the heat it receives is called its "heat range". The relationship between the spark plug temperature and vehicle speed and heat range is expressed with a graph like that in the figure. Example a R5671A-7 (a good street/strip plug) is a cold plug where a R5671A-10 is a very cold plug used for large 400hp and up nitrous and other power adder applications) 14mm HOT 3/4" Reach RFN14LY 82 5/8" Hex RCN12LYC 412 Extended Gap COLD 14mm .884" Rch. Spark plugs may physically appear to be the same but have a different heat range based on the insulator design or shape. When the heat rating is too high: 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 … 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. Rather, the heat range is a measure of the spark plug’s ability to remove heat from the combustion chamber. Any violation shall constitute a copyright infringement and shall be subject to prosecution. If you need to know which spark plugs are suitable for your vehicle, simply use our handy spark & glow plug product lookup. There are restrictions on the temperatures at which spark plugs can be used: the lower limit is the self-cleaning temperature and the upper limit is the pre-ignition temperature.A spark plug only functions completely when its center electrode temperature is between these temperatures of about 500°C and 950°C. VW, BMW | We have revised opening times and delivery schedules over the festive period. When the center electrode reaches 950°C or higher, pre-ignition (early ignition) occurs, meaning that the electrode serves as a heat source and ignition occurs without a spark. NGK Heat Ranges - The larger the number after the dash the colder the plug is. On the other hand, high heat range plugs have short insulator legs and the surface area affected by the flame and the gas pocket capacity are small. 2544 is the coldest plug in that plug family, and 2546 is the hotest. Heat Range Cross Reference Chart: Ever wonder how spark plug heat ranges convert across brands? Therefore, output falls and this can reach the level of electrode wear and insulator damage. 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. TecAlliance (who provide their TecDoc vehicle list and TecDoc data for matching of parts to vehicles). Resistor Stock No. The number at the end of the part indicates the gap. Dexron | Call us at 713-459-6977. 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