Spark plug heat ranges chart - NGK’s performance and heat dissipation capacity cannot beat that of Champions. Conductivity. Champion Spark Plug is better and has higher conductivity than NGK. NGK spark plugs have better and higher conductivity. Size. Tread Diameter:0.551. Gap Size: 0.40 inch. Type. Copper plus spark plug.

 
Sep 15, 2022 · The optimum spark plug heat range is between 5000 C to 8000 C (or between 900 0 F to 1500 0 F) If the spark plug is operating at a temperature below the optimum range, then you will start noticing carbon deposits. If, on the other hand, the spark plug temperature is too high, there will be pre-detonation. The air-fuel mixture will start burning ... . Georgia.com reviews

Jan 31, 2018 · This process involves making a pull (on a dyno or a pass), and shutting down the engine ASAP so the reading isn't tainted by idle time. Then the plugs are pulled and inspected. After a change is ... Step 1: Get the tools and the new spark plug (as per the desired heat range of 7 or 6) Step 2: Allow time for the vehicle to cool down. Step 3: Disable the connectivity with the battery. Step 4: Depending on your vehicle’s design, remove the coil-on-plug connectors or spark plug wires.Home | Bosch Automotive Aftermarket5- Code 5 defines the heat range of the spark plug. The lower the number, the hotter the spark plug will be. Code 5 defines that it is a moderate spark plug with a medium hit range. Here are some of the other meaning you should know regarding the heat range of the spark plug-. NGK Heat range.The contrast with state institutions is glaring, even though many of them have a much better academic reputation. Like many government-run entities, public universities in India of...An example is: DPR5EA-9; 2887. DPR5EA-9 is the part number and 2887 is the stock number. The exception to this is racing plugs. An example of an NGK racing plug is R5671A-11. Here, R5671A represents the plug type and -11 represents the heat range. The stock number is 6596. NGK lists a design symbols chart in the front of every spark plug catalog.If the spark plug heat range is too hot, pre-ignition can occur. A switch in heat range of the spark plug will change the tem-perature of the spark plug tip by 70-120 degrees. If you are unsure of the correct heat range to use, always start with a colder spark plug.ACCEL HP Spark Plugs are made with a Copper core which is a better conductor than Platinum and Iridium. They deliver a stronger spark especially in high performance applications where high combustion pressures are present. Copper is much better at dissipating heat than other materials which lessens the chance of a misfire.The AC Delco Spark Plug Decoder Table Prefix and suffix letters are used to identify a specific type plus the numbers relate to thread size and heat range. For example, the R45TS spark plug shown is: · R - Resistor · 4 - 14 mm Thread · 5 - Heat Range (range 1-5 start with a 3) · T - Taper Seat (No T for a gasketed plug)NGK.comHeat Range ; 16, 5, 12,11 ; 20, 6, 10,9 ; 22, 7, 8,7 ; 24, 8, 6,63,61 ...For a spark plug to function properly, it must have a tip temperature high enough to burn off carbon deposits (self-cleaning) and avoid fouling, while remaining low enough to avoid overheating the ceramic firing end and pre-ignition. For most vehicles, the factory recommended heat range is sufficient; however, on some modified or special-use ... An example is: DPR5EA-9; 2887. DPR5EA-9 is the part number and 2887 is the stock number. The exception to this is racing plugs. An example of an NGK racing plug is R5671A-11. Here, R5671A represents the plug type and -11 represents the heat range. The stock number is 6596. NGK lists a design symbols chart in the front of every spark plug catalog. SPARK PLUG TROUBLE TRACER CHART • Appearance: Centre and/or ground electrodes are rounded and the gap is excessive • Cause: General wear (spark plug has come to the end of its life). However, the greyish tan/white colour indicates that the plug is the correct heat range and also that the fuel/ignition systems and engine are generally in …Onan Spark Plugs: Both the 4K & 6K use the same heat range spark plug. Plug gap for both is .020” Cummins Onan spark plugs are part# 167-0262-99 <$7. The X-‐7525B service manual Section 24C page28 calls for the use of an AC Delco R46S spark plug. Possible spark plugs that cross for AC DELCO R46S:Spark Plug Thread Size: 14mm . Spark Plug Reach (in.): 0.750 in. Spark Plug Reach (mm): 19.05mm . Shorty Spark Plug: No . Resistor: No ... These replacement spark plugs are available in colder heat ranges than most plug manufacturers to support modified engines. They feature a cut background electrode, which improves ignitibility and faster ...Have supercharged or turbocharged your engine. Use nitrous oxide or methanol. Have modified the air/fuel mixture or ignition timing for your engine. Drive at high speeds for extended periods, such as when racing. To shop around for colder heat range spark plugs, please check out Carpart.com.au.If you’re a car owner, you may have come across the term “spark plug replacement chart” when it comes to maintaining your vehicle. A spark plug replacement chart is a useful tool t...Vehicle. Spark Plug Heat Ranges Explained & Cross Reference Table. Learn what a spark plugs heat range means & use our cross reference table. Using a spark plug … Heat Range. Temperature curves of spark plugs with different heat-range code numbers at full load in the same engine. j Spark plug with high heat-range code number (“hot plug”). Large insulator nose area absorbs more heat, low heat dissipation. —————— Heat-absorbing surface. - - - - - - Thermal conduction path. 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 heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. Effect of Selecting Wrong Heat Range. 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. 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.Object moved to here.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). This …Most spark plug manufacturers recommend that the tip temperature remain between 500° C and 850° C. Heat ranges are designated by each spark plug …Critical factors involved in choosing the correct spark plug heat range include: 1. Air/Fuel Mixture: Lean air/fuel ratios raise cylinder-head temperatures, requiring a colder plug. Rich air/fuel ...Principle Applications & Specifications. Passenger Cars & Light Trucks 2011 - 1996. Passenger Cars & Light Trucks 1995 - 1960. Recreational Vehicles - Motorcycles. Commercial Equipment - Lift Trucks. Small Engine - Power Equipment Engines. Installation Bulletin for High Thread Series Spark Plugs.Low-power engines – low heat range or spark plugs. High-power engines – high hot range or cold spark plugs. Thermal range reference diagram. As we mentioned above, NGK spark plugs have a heating range ranging from 2-11. Let’s take a look at the heat range chart with complete information about that number.E3 Racing Spark Plugs incorporate the Edge-to-Edge patented DiamondFIRE technology design that directly sends the spark travel towards the air-fuel mixture which maximizes the burn. The result is a faster flame kernel, a more complete combustion, greater power and higher fuel efficiency. These spark plugs produce excellent heat transfer, with ...NGK BKR8EIX (Iridium) Denso IK24 (Iridium) Bosch FR5DTC (Copper) Bosch F5DPOR (Platinum/Side Fire)*. * - Many members have found real good luck with the Bosch F5DPOR's. Below is a quick cross-reference list for all the plugs listed above in Heat Range: ** - Audi/VW Factory 1.8T/2.7T Heat Range.Feb 8, 2010 ... Spark plug temperatures can reach in excess of 3000 °F. ... mixture, which occurs when excessive heat and cylinder pressure causes the air/fuel ...Heat Range Chart Cross reference . Cold Hot. Brisk. 8. 10. 12. 14. 15. 17. NGK. 10. 9. 8. 7. 6. 5. Denso. 31. 27. 24. 22. 20. 16Frequently Asked Questions - Explanation of NGK heat ranges in spark plugsYou will have the basic understanding whether it is a hot or cold spark plug of 5 majors spark plug brands. Heat range reference chart of some popular brands. …ACCEL HP Spark Plugs are made with a Copper core which is a better conductor than Platinum and Iridium. They deliver a stronger spark especially in high performance applications where high combustion pressures are present. Copper is much better at dissipating heat than other materials which lessens the chance of a misfire.A single car has around 30,000 parts. Most drivers don’t know the name of all of them; just the major ones yet motorists generally know the name of one of the car’s smallest parts ...www.ngk.comThe spark plug heat range does NOT control the temperature at which the engine runs; fitting a ‘cold’ plug will not make an overheating engine run colder, nor will fitting a ‘hot’ plug make a cool-running engine run warmer. ... For more information, have a look at this NGK spark plug reference chart. When dealing with Bosch spark plugs ... To prevent pre-ignition and overheating the optimum spark plug tip temperature generally needs to be below about 800°C (1472°F). So there we have the optimum temperature range for our spark plug – somewhere between around 500 to 800°C (932°F to 1472°F). E3.102 is a 14mm, 0.750” reach plug with a 5/8” hex and a gasket seat. It is built to have a cold heat range, non-resistor, and is used a variety of racing applications. E3.102 is a heat range hotter than E3.101. E3 racing plugs are fitted with its patented DiamondFIRE ground electrode, which is secured with two legs to the shell.268 posts · Joined 2022. #21 · Aug 13, 2022. Here, put "champion rule for spark plug heat range" in google. "According to Champion Spark Plugs, for normally aspirated, gasoline-fueled engines, a good rule of thumb is to go about one heat range colder for each full point in compression ratio increase from 9:1 through about 12.5:1, and two heat ...Spark Plug Thread Size: 14mm . Spark Plug Reach (in.): 0.750 in. Spark Plug Reach (mm): 19.05mm . Manufacturer Heat Range: 12 . Shorty Spark Plug: ... Champion racing spark plugs position the spark approximately 1/16 in. into the combustion chamber and feature colder heat ranges that use a shortened ground electrode. This is designed to …This is a *basic* table of approximate spark plug heat range equivalents from manufacturers NGK, Denso and Champion. Note that Champion have further additional …Dec 24, 2020 · Low power engines – low heat range or hot spark plug. High power engines – high heat range or cold spark plug. Heat Range Reference Chart. As we mention above, the heat range for NGK spark plugs varies from 2-11. Let’s take a look on the heat range chart where there is full information about the number. Money's picks for the best plug-in hybrid SUVs in 2023, including top choices for value, handling, safety, technology and features. By clicking "TRY IT", I agree to receive newslet...Spark Plug Thread Size: 14mm . Spark Plug Reach (in.): 0.750 in. Spark Plug Reach (mm): 19.05mm . Shorty Spark Plug: No . Resistor: No ... These replacement spark plugs are available in colder heat ranges than most plug manufacturers to support modified engines. They feature a cut background electrode, which improves ignitibility and faster ...Oil appears in the spark plug well when there is a leaking valve cover gasket or when an O-ring weakens or loosens. Each spark plug has an O-ring that prevents oil leaks. When the ...Spark Plug Thread Size: 14mm . Spark Plug Reach (in.): 0.750 in. Spark Plug Reach (mm): 19.05mm . Shorty Spark Plug: No . Resistor: No ... These replacement spark plugs are available in colder heat ranges than most plug manufacturers to support modified engines. They feature a cut background electrode, which improves ignitibility and faster ...Incorrect spark plug heat range, a loose spark plug, improper ignition timing, or a lean air/fuel ratio are all potential contributors to an overheated engine. You need to change the spark plug. Source: golfmk7. 5. Lead Fouling. Yellowish-brown deposits on the insulator nose are a telltale sign of lead fouling.A conventional copper electrode replacement for an AC Delco #10 Rapid Fire platinum tip spark plug is a AC Delco R43T spark plug. If you want one step hotter than AC Delco R43T, you can use AC Delco R44T. An AC Delco R45T spark plug is two steps hotter than a AC Delco R43T spark plug. Usually, an AC Delco spark plug that is only one step hotter ...Sep 15, 2022 · The optimum spark plug heat range is between 5000 C to 8000 C (or between 900 0 F to 1500 0 F) If the spark plug is operating at a temperature below the optimum range, then you will start noticing carbon deposits. If, on the other hand, the spark plug temperature is too high, there will be pre-detonation. The air-fuel mixture will start burning ... The numbers on spark plugs indicate properties such as spanner width and design, heat rating, thread length, construction features and electrode distances. Different manufacturers ...The contrast with state institutions is glaring, even though many of them have a much better academic reputation. Like many government-run entities, public universities in India of...AGSF32C - Short name: SP447. Recommended for 1993 Cobra, GT40 Heads. 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.Spark plugs with a hotter heat range will burn off carbon deposits more easily than a colder plug. “As an example, an Autolite copper 105 versus an XP Iridium 105 will have identical ceramic temperatures and the carbon burn off will be the same,” says Reeves. A spark plug’s reach is defined as the length of the threads.The correct temperature for plugs is selected at the engine design and testing stage and is determined by combustion temperatures. Brisk Spark Plugs Temperature Scale, heat range, Cross Reference Chart, NGK, DENSO, BOSCH, CHAMPION, hot plug, cold plug, what temperature plug, selecting right plugs, plugs overheating, fouling plugs, misfire, … A spark plug's heat range is the degree to which it disperses heat. Find out what the appropriate heat range is for your particular spark plug! Sep 14, 2009 · Explanation of a Spark Plugs Heat Range from NGK Spark Plugs USA Object moved to here.Onan Spark Plugs: Both the 4K & 6K use the same heat range spark plug. Plug gap for both is .020” Cummins Onan spark plugs are part# 167-0262-99 <$7. The X-‐7525B service manual Section 24C page28 calls for the use of an AC Delco R46S spark plug. Possible spark plugs that cross for AC DELCO R46S:Boosted/nitrous engines may use a 8, 9 or 10 heat range plug depending on levels of boost/nitrous. A 7 heat range is usually a safe starting point for pump gas ...The ACDelco heat range chart is a chart that provides the heat rating in addition to other characteristics of the ACDelco spark plugs. The heat rating indicates the thermal characteristic of the spark plug, or how hot or how cold the spark plug is. The chart details the plug identification table. It consists of possible spark plug prefix values ...deposits will not burn off the tip and the spark plug will foul. If the spark plug heat range is too hot, pre-ignition can occur. A switch in heat range of the spark plug will change the temperature of the spark plug tip by 70-120 degrees. If you are unsure of the correct heat range to use, always start with a colder spark plug.Ford Engines + Motorcraft®Plugs = Optimum System Performance. Upper center core. • Nickel-plated for better corrosion resistance. Full ground strap. • For better heat transfer within the combustion chamber. Scavenging area. • Allows more carbon build-up before misfires occur. Insulator Thicker for better misfire prevention. High-Strength ...Do you know how to read and understand the NGK spark plug numbering systems? If not, you can visit this webpage to learn the meaning and function of each letter and number in the NGK spark plug codes. You will also find a handy chart that shows the different types and features of NGK spark plugs, such as iridium, platinum, nickel, and more. Whether … Heat Range Chart Tableau des températures de bougies Tabla de Rango Térmico Reach/Portée/Alcance Projection/Prolongé/Proyección Hex Size/Hexagonal/Hexágono Here's a breakdown of the two main types: Cold Spark Plugs: These plugs feature a shorter porcelain insulator and ground strap, allowing heat to dissipate quickly. Cold spark plugs are ideal for high-performance applications or vehicles with increased cylinder pressure. Hot Spark Plugs: Conversely, hot spark plugs have a longer porcelain ...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 heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. Effect of Selecting Wrong Heat Range. They don’t. the spark plug heat range only indicates the rate at which the spark plug dissipates its firing end heat to the engine. Selecting a spark plug with the proper heat range will ensure that the tip will maintain a temperature high enough to prevent fouling, yet be cool enough to prevent pre-ignition. While there are many things that ... 22577 posts · Joined 2007. #4 · Jan 2, 2020. Champion uses a completely different heat range scale/plug numbering system than Autolite or NGK, that is why is looks so different. That is also why you need to use a heat range/crossover interchange chart to compare plugs. You can't compare them directly just using the numbers on the plug.Heat Range Reference. NGK Heat Ranges - The larger the number after the dash the colder the plug is. 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) Autolite Heat Ranges - The larger the last digit in the part number, …Step 1: Get the tools and the new spark plug (as per the desired heat range of 7 or 6) Step 2: Allow time for the vehicle to cool down. Step 3: Disable the connectivity with the battery. Step 4: Depending on your vehicle’s design, remove the coil-on-plug connectors or spark plug wires.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). This is largely determined by the temperature of the gas inside the combustion chamber and the spark plug design.Object moved to here.Ask An Expert: Heat range is one of the most important and often misunderstood factors when choosing the correct spark plug for your engine.Let our DENSO exp... temperature of the tip of the spark plug. If the heat range is too cold, the deposits will not burn off the tip and the spark plug will foul. If the spark plug heat range is too hot, pre-ignition can occur. A switch in heat range of the spark plug will change the temperature of the spark plug tip by 70-120 degrees. 22577 posts · Joined 2007. #4 · Jan 2, 2020. Champion uses a completely different heat range scale/plug numbering system than Autolite or NGK, that is why is looks so different. That is also why you need to use a heat range/crossover interchange chart to compare plugs. You can't compare them directly just using the numbers on the plug.Nitrous (one step colder) Heat Range: 10. Gap: Consult ignition mfg. Plug: NGK 5672A-10 (stock number 7942); Autolite AR50; Denso IQ31 (stock number 5323) Nitrous (two steps colder) Heat Range: 11. Gap: Consult ignition mfg. Plug: Denso IQ34 (stock number 5324) LT1 w/ Trick Flow & Edelbrock Heads.Principle Applications & Specifications. Passenger Cars & Light Trucks 2011 - 1996. Passenger Cars & Light Trucks 1995 - 1960. Recreational Vehicles - Motorcycles. Commercial Equipment - Lift Trucks. Small Engine - Power Equipment Engines. Installation Bulletin for High Thread Series Spark Plugs.NGK Spark PlugsThe ACDelco heat range chart is a chart that provides the heat rating in addition to other characteristics of the ACDelco spark plugs. The heat rating indicates the thermal characteristic of the spark plug, or how hot or how cold the spark plug is. The chart details the plug identification table. It consists of possible spark plug prefix values ...HEAT RANGE CHART - COPPER PLUS SPARK PLUG / STOCK NUMBER Thread Size Heat Range Non-Resistor Stock No. Resistor Stock No. Non-Resistor Stock NO. Resistor Stock No. 14mm HOT 3/4" Reach RFN14LY 82 5/8" Hex RCN12LYC 412 Extended Gap COLD 14mm .884" Rch. NORM RC11ZYC4 311 5/8" Hex HOT RN14MC5/RN16YC5 …A good rule of thumb: use one heat range colder for every 75–100hp added. 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 heat range numbering system used by spark plug manufacturers is not universal.E3.102 is a 14mm, 0.750” reach plug with a 5/8” hex and a gasket seat. It is built to have a cold heat range, non-resistor, and is used a variety of racing applications. E3.102 is a heat range hotter than E3.101. E3 racing plugs are fitted with its patented DiamondFIRE ground electrode, which is secured with two legs to the shell.

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spark plug heat ranges chart

Heat Range: (click for larger image) Heat Range = Ground Strap, the ground strap indicates the heat-range of the spark plug. If the "color" of the ground strap "changes" too close to the ground strap's end, (which is above the center electrode), then the heat-range is "too cold" , meaning that the strap is loosing heat too quickly to the base ring, and is not able …Use the proper tools to install your spark plugs, a 5/8" or 13/16" spark plug socket. Also be sure that the socket is sitting correctly on the plug before applying torque. Incorrect tools or crooked tools could crack the spark plug. - Dick Podiak, E3 Spark Plugs Engineer. Inspect all parts of the ignition system for wear or damage (spark plug ...Vehicle. Spark Plug Heat Ranges Explained & Cross Reference Table. Learn what a spark plugs heat range means & use our cross reference table. Using a spark plug …The Solana Foundation is working to integrate AI into its network with a ChatGPT plug-in developed by Solana Labs. As the artificial intelligence market continues to heat up, a num...The spark plug heat range has no relationship to the electrical energy transferred through the spark plug. The heat range of a spark plug is the range in which the plug works well thermally. The heat rating of NGK spark plugs is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. ...Last updated on 03/08/2022. This is a comparison of a cold heat range plug (left) versus a much hotter heat range plug (right). Notice how the distance between the ceramic and the spark plug shell on the hotter plug requires heat to travel a farther distance, which maintains more heat in the spark plug. A hotter heat range plug is preferable ...5- Code 5 defines the heat range of the spark plug. The lower the number, the hotter the spark plug will be. Code 5 defines that it is a moderate spark plug with a medium hit range. Here are some of the other meaning you should know regarding the heat range of the spark plug-. NGK Heat range.Yamaha's YZF-R6 has been a favorite among track-day riders and racers. Praised for its agility and lightweight frame, the R6 has earned a reputation for performance. While the bike...ACDelco Spark Plugs feature only high-quality parts to help ensure durability and consistent performance: Electrodes built on a foundation of iridium, platinum or copper. 100% copper cores. Spark plugs are protected with one-piece ceramic insulators. We offer a full line of ACDelco Spark Plug products. Whether you are choosing from our iridium ...Advertisement You have your fire pit and a nice collection of wood. The only thing between you and a nice evening roasting s'mores is a spark. There are many methods for starting a...Tenneco's Champion ® Industrial Spark Plugs is an industry-leading brand name and technology servicing all applications and markets throughout the world. Champion was the first to pioneer ignition products for industrial applications and, for over 100 years, is still driving the market in product excellence. Champion's industrial products ...Step 1: Get the tools and the new spark plug (as per the desired heat range of 7 or 6) Step 2: Allow time for the vehicle to cool down. Step 3: Disable the connectivity with the battery. Step 4: Depending on your vehicle’s design, remove the coil-on-plug connectors or spark plug wires.Take a look at the chart for the range of Champion offerings. Please note that the numbers don’t indicate degrees; they’re product codes to give an indication of the heat range. The higher the number, the hotter the plug, and the lower the number, the colder the plug.A conventional copper electrode replacement for an AC Delco #10 Rapid Fire platinum tip spark plug is a AC Delco R43T spark plug. If you want one step hotter than AC Delco R43T, you can use AC Delco R44T. An AC Delco R45T spark plug is two steps hotter than a AC Delco R43T spark plug. Usually, an AC Delco spark plug that is only … However, because of more exposure to high temperature combustion gases and because ground electrode becomes longer, heat resistance and durability decrease. The higher the level of tuning, the greater the need is to use a less projecting type. As the level of tuning is increased, so does the need for higher heat range. Firstly, consider the heat range. A colder spark plug, such as the HD-6R12 plug, is ideal for high-performance engines or those running at higher RPMs. ... A spark plug chart helps in choosing the right spark plug for your application, whether it’s Iridium spark plugs or standard plugs. It ensures that during service, when using a torque ...The world leader in spark plug technology for over 80 years. Don't just ask for a spark plug, insist on NGK. Menu Close. Products . Part finder Close. NGK / NTK. History ; Worldwide ; FAQ ; Contact ; ... Spark Plug Heat Ranges. You might also like. NGK Spark Plug Australia Changes Corporate Name to Niterra Australia . NGK Spark Plug Australia ...and material, plugs produced by various manufacturers do not have exactly the same heat range. Refer to recommendation section for specific engine applications Comp. Part# NGK STK # NGK # Comp. Part# NGK STK # NGK # 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 B4LThe heat ranges may be drastically different between two different plugs, and engine damage or poor performance may result. See your local installer or retailer for details. (Bold mine.) The prefix “41” stands for the manufacturer’s product line (e.g., 41 = spark plug) Numbers after the prefix indicate the type of spark plug and also the ....

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