NGK.com specializes in hard to find NGK products. Our NGK cross reference includes over 80,000 records! In identical spark plug types, the difference from one heat range to the next is the ability to remove approximately 70°C to 100°C from the combustion chamber. A very expensive heat range test can be performed however a more viable option is to start with a colder heat range spark plug and perform some testing. Where is E3? Where is E3? Note: This cross-reference is a guide only and may not be suitable for all vehicles. Modern exhaust after treatment systems require control in regard. Resistor Caps. Part Number. One advantage of the 'IX' range is the use of a very fine-wire centre electrode (0.6 mm diameter), which requires less voltage to create a spark, beneficial when using a low powered ignition system. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. The world’s largest OE oxygen sensor manufacturer now offers a full line of premium technical sensors for the aftermarket, featuring more than 6,800 SKUs. Spark Plug Heat Range Cross Reference . HEAT RANGE CHART Page 3 of 3 NON- PROJECTED TRUCK PLUG PLUGEZ START STAINLESS TRUCK STEEL 14mm .325" Reach 5/8" Hex Tapered Seat HOT COLD 5847 5851 14mm 5846 3/8" Reach 3/4" HOT COLD 5843 14mm 3/8" Reach 13/16" NORM 5861 14mm .460" Reach 5/8" Hex 5942 Tapered Seat HOT COLD 4113 4019 14mm 1/2" Reach 13/16" **Surface Gap HOT COLD 593 3 593 … Explanation of a Spark Plugs Heat Range from NGK Spark Plugs USA. Per car qty. (besides fouling), Can break insulators or break off ground electrodes, Pre-ignition most often leads to detonation, Plug tip temperatures can spike to over 3000°F during the combustion process (in a racing engine). This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. Multiple tools are available to find part dimensions and features. iridium upgrade stock no. So, fuel delivery should be increased. The information contained in this guide applies to all types of internal combustion engines: two stroke engines, rotary engines, high performance/racing engines and street vehicles. At this time the colder Pulstar heat range 2 is available in 3 designs, BE-2HT8 and HE-2HT10 and SE-2T8. This is called “Thermal Performance”, and is determined by the heat range selected. Installation Guide on how to install. Part# NGK STK # NGK # Comp. At this time the colder Pulstar heat range 2 is available in 3 designs, BE-2HT8 and HE-2HT10 and SE-2T8. Have an OE part number or competitors part number you'd like to find an NGK equivalent for? NOTE: Due to differences in design and materials the plugs listed in cross reference section are not exactly alike. The heat range measurement is determined by several factors; the length of the ceramic centre insulator nose and its’ ability to absorb and transfer combustion heat, the material composition of the insulator and centre electrode material. The spark plug cannot create these conditions, but it must be able to cope with the levels of heat…if not, the performance will suffer and engine damage can occur. Technical. Using the NGK Cross Reference. Please check specific vehicle application and owner’s manual. Heat range; Electrode gap; HEAT RANGE. 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) Spark plugs are designed to operate in a temperature range of 450 – 870°C, when an engine is modified (generally to produce more power which produces more heat) in turn the engine and subsequent spark plug temperatures increase. A hot spark plug maintains a higher internal operating temperature to burn off oil and carbon deposits, and has no relationship to spark quality or intensity. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. This is called “Electrical Performance.”. Hot spots will allow the air/fuel mixture to pre-ignite. The resulting shock wave causes an audible pinging sound. The last digit in an Autolite part number represents the heat range within a plug family. 4. Heat Range Conversion Chart Learn More . A spark plug can deliver a weak spark (or no spark at all) for a variety of reasons…defective coil, too much compression with incorrect plug gap, dry fouled or wet fouled spark plugs, insufficient ignition timing, etc. Racing Heat Range and Tuning Guide. Learn More . The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or … 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 most critical factor for a spark plug that needs to be considered when an engine is modified is HEAT RANGE. Yes. As the piston is being forced upward by mechanical action of the connecting rod, the pre-ignited explosion will try to force the piston downward. A projected style spark plug firing tip temperature is increased by 10°C to 20°C. This is detonation. If the heat range is too cold, the spark plug will be unable to properly self-clean by burning off carbon deposits. bpr6es. Spark plugs may physically appear to be the same but have a different heat range based on the insulator design or shape. Using the NGK Cross Reference. The temperature of the spark plug’s firing end must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. Please refer to our application listings for full details. 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. Careers at NGK : Join our team. (Engine temperature can affect the spark plug’s operating temperature, but not the spark plug’s heat range). The spark plug has two primary functions: Spark plugs transmit electrical energy that turns fuel into working energy. 70°-100° C, Increases in firing-end temperature are proportional to engine speed and load. platinum upgrade stock no. NGK have plenty of accessories goods for your needs. 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. It is important to remember that spark plugs do not create heat , they can only remove heat. The temperature at this point is where the accumulated carbon and combustion deposits are burned off. NGK PULSTAR DENSO CHAMPION BOSCH; HOTTER: 2 9: 18, 19 ... COLDER: 12 37 Where is Autolite? Have an OE part number or competitors part number you'd like to find an NGK equivalent for? Higher Compression Ratios/Forced Induction elevates spark plug tip and in-cylinder temperatures, To remove heat from the combustion chamber, The materials/construction of the centre electrode and porcelain insulator, Rich air/fuel mixtures cause tip temperature to drop, causing fouling and poor drivability, Lean air/fuel mixtures cause plug tip and cylinder temperature to increase, resulting in pre-ignition, detonation, and possibly serious spark plug and engine damage, It is important to read spark plugs many times during the tuning process to achieve the optimum air/ fuel mixture. For example, take the 254x plug series. Like a patient’s thermometer, the spark plug displays symptoms and conditions of the engine’s performance. Choosing the right heat range is crucial for high performance engines. Wondering what the numbers and letters on an NGK spark plug cap mean? The insulator nose length is the distance from the firing tip of the insulator to the point where insulator meets the metal shell. 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. Using the Reverse Engineering Tool. The borderline between the fouling and optimum operating regions (500°C) is called the spark plug self-cleaning temperature. Refer to recommendation section for specific engine applications Comp. Spark plugs are one of the most misunderstood components of an engine. The heat range of a spark plug is the range in which the plug works well thermally. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. As mentioned a spark plug operates in the range temperature 450 – 870°C, at 450°C carbon deposits being to burn off and if a plug may have a very black insulator nose at a lower temperature. Autolite's numbering system does not have a standardized heat range identifier. NGK lists a design symbols chart in the front of every spark plug catalog. Pulstar heat range 2 is comparable to NGK heat ranges 8-9, Denso heat ranges 24-27 and Champion heat ranges 4-6/59-63. What is Heat Range? As humidity increases, air intake volume decreases. Should I Gap My NGK Plugs? ... Heat Range Conversion Chart Learn More . An example of an NGK racing plug is R5671A-11. Glow Plugs Glow plug construction. #na. Spark plugs are the “window” into your engine (your only eyewitness to the combustion chamber), and can be used as a valuable diagnostic tool. Air/fuel mixture should be leaner, depending upon ambient temperature. Finding and Comparing NGK Part … Numerous questions have surfaced over the years, leaving many people confused. ), adding forced induction (Nitrous, Turbo charging or Supercharging), As compression increases, a colder heat range plug, higher fuel octane, and careful attention to ignition timing and air/fuel ratios are necessary. NGK.com specializes in hard to find NGK products. 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. Plug gap. Failure to select a colder spark plug can lead to spark plug/engine damage, Advancing ignition timing by 10° causes tip temperature to increase by approx. same heat range. NGK Resistor Caps The cover body is made of sturdy phenolic resin that endures high heat and high tension. ngk spark plug upgrade chart original plug stock no. Bearing in mind that the insulator nose length is a determining factor in the heat range of a spark plug, the longer the insulator nose, the less heat is absorbed, and the further the heat must travel into the cylinder head water journals. The colder type removes heat more quickly, and will reduce the chance of pre-ignition/detonation and melting or damage to the firing end. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. Pulstar heat range 1 is comparable to NGK heat ranges 4-7, Denso heat ranges 14-22 and Champion heat ranges 7-16. Then, it's transferred to the coolant passages. Exhaust gas temperature sensors. Due to differences in design and material, plugs in cross reference From there, it's transferred to the cylinder head. The exception to this is racing plugs. We are not NGK Spark Plugs USA. The heat range numbering system used by spark plug manufacturers is not universal. Choosing the right heat range is crucial for high performance engines. NGK Part # NGK Stock # 41-932 PZTR5A-15 7862 41-983 PTR4B-15 5146 41-985 IZTR5B11 1465 MR42LTS BPR6EFS 3623 MR43LTS TR5 2238 MR43T BR6FS 4323 MR44T YR5 7052 Note: This cross chart is for reference only. Since the insulator tip is the hottest part of the spark plug, the tip temperature is a primary factor in pre-ignition and fouling. It is important to remember that spark plugs do not create heat, they can only remove heat. 12 page guide by Champion Sparking Plug Co. Ltd.'s Competition Department, 1973. iridium upgrade stock no. Rather, the heat range is a measure of the spark plug’s ability to remove heat from the combustion chamber. E3 does not have a standardized heat range identifier. Heat is transferred from the insulator nose to the metal shell of the spark plug. This may lead to pre-ignition/detonation and expensive engine damage. We are not NGK Spark Plugs USA. Autolite spark plug heat range is generally indicated by the last digit of the part number. 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 Charts & Tools Charts & Tools; FAQs FAQs; Non-Automotive Non-Automotive; Product Information Product Information; Vehicle Maintenance Vehicle Maintenance; Learning Center. NGK.com specializes in hard to find NGK products. Some owners successfully use the modern NGK Iridium 'IX' range of spark plugs in conjunction with magneto ignition systems. Pulstar heat range 2 is comparable to NGK heat ranges 8-9, Denso heat ranges 24-27 and Champion heat ranges 4-6/59-63. The NGK range of resistor caps provide the perfect connection. 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. Learn More . A colder heat range is necessary when the engine is modified for performance, subjected to heavy loads, or is run at high rpms for a significant period of time. Heat Range Conversion Chart. If the tip temperature is lower than 500°C, the insulator area surrounding the centre electrode will not be hot enough to burn off carbon and combustion chamber deposits. The rate of heat transfer is determined by: A spark plug’s heat range has no relationship to the actual voltage transferred though the spark plug. i all details. Be the first to know about sales and promotions, NGK Spark Plug Resistor Cover Numbering System, Finding and Comparing NGK Part Specifications. The heat range measurement is determined by several factors; the length of the ceramic centre insulator nose and its’ ability to absorb and transfer combustion heat, the material composition of the insulator and centre electrode material. Part# NGK STK # NGK # 44 3510 B6S 41-963 7740 PTR5C-13 45FFS 6222 BPR5HS 45 3210 B4 41-965 2467 PTR5A-13 45L 3112 B4L 46 3210 B4 41-974 7862 PZTR5A-15 45NS 7832 BP5ES Result is lower combustion pressures and temperatures, causing a decrease in the spark plug’s temperature and a reduction in available power. Heat range is controlled by the length of the insulator nose. As air temperature falls, air density/air volume becomes greater, resulting in leaner air/fuel mixtures. 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. As temperature increases, air density decreases, as does intake volume, and fuel delivery should be decreased. Explanation of a Spark Plugs Heat Range from NGK Spark Plugs USA Part# NGK STK # NGK # Comp. With a full line of spark plugs, coils, and wire sets, NGK covers 95% of import and domestic vehicles on the market. The firing end appearance also depends on the spark plug tip temperature. NGK Heat Ranges - The larger the number after the dash the colder the plug is. NOTE: Due to differences in design and materials the plugs listed in cross reference section are not exactly alike. 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. When traveling at a consistent high rate of speed, or carrying/pushing very heavy loads, a colder heat range spark plug should be installed. Below is a list of some of the possible external influences on a spark plug’s operating temperatures. To contact them, click here. The stock number is 6596. Heat rating and heat flow path of NGK Spark Plugs. A sufficient amount of voltage must be supplied by the ignition system to cause it to spark across the spark plug’s gap. If the tip temperature is higher than 850°C the spark plug will overheat which may cause the ceramic around the centre electrode to blister and the electrodes to melt. Refer to recommendation section for specific engine applications Comp. Part# NGK STK # NGK # 44 3510 B6S 41-963 7740 PTR5C-13 45FFS 6222 BPR5HS 45 3210 B4 41-965 2467 PTR5A-13 45L 3112 B4L 46 3210 B4 41-974 7862 PZTR5A-15 45NS 7832 BP5ES 40TS 5034 R5674-7 41-980 7740 PTR5C-13 45S 3332 … Example: R5671A-10 has a heat range of 10. Autolite has 2544, 2545 and 2546 available. Select your vehicle --> eng 19241622 & 20bf1475. 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