The letter “G” indicates a precious metal center electrode. This is a high enough amount of resistance to cut down on ignition noises, but not so high that engine performance suffers. A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. Prices may be subject to change without notice. NGK is the largest manufacturer of spark plugs for motorcycles and ATVs in the world, and come as original equipment on many vehicles. Follow these instructions on how to remove a spark plug. The letter “P” indicates a platinum center electrode. “H” indicates a 1/2″ reach, while “E” indicates a 3/4″ reach. The Denso Iridium spark plug does a lot to help the motorist. Here are the most common spark plug codes by brand. Any information provided on this website is for general guidance only. Each spark plug is connected to a spark plug wire (in conventional and electronic ignitions). A -8 should be gapped to.8 mm or.032″, -9 should be gapped to.9 mm or.035″, -10 should be gapped to 1.0 mm or.040″ and -11 should be gapped to 1.1 mm or.044″. This can help in identifying suitable replacement parts from Denso or even equivalent from other manufacturers. The letter “Y” indicates a V-grooved center electrode. The letters “H” or “Y” indicate a projected tip. It is best to use the heat range specified by the manufacturer. Note; Do not use a projected tip spark plug where it is not called for as it could contact the piston and cause catastrophic engine damage. Our listing a part does not guarantee its availability. It does not constitute any contractual term, representation or warranty. The letters “IX” indicate an iridium center electrode. The letter “K” in this location would indicate a 3/8″ hex (wrench) size. It’s explicitly designed to improve performance, which is a big demand for any vehicle today. Without knowing the manufacturer of the plug it is difficult to give more information. Both of … This applies to standard copper and platinum plugs. A carbon-fouled plug will have black, dry soot on the electrodes and insulator tip. The letter “Y” indicates a V-grooved center electrode. Mirage Spark plug Recommendations: (low boost=6psi-13psi high boost=14psi+) Brand - type - part# - stock# - gap 4G (1993-1996) 1.8 Standard: NGK V-Power BKR5E-11 # 6953 0.044 Turbo (low boost): The first number (8 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. This can help in identifying suitable replacement parts from Champion or even equivalent from other manufacturers. Spark plugs require voltage in excess of 20,000 volts from a lower voltage battery. Once the voltage exceeds the dielectric strength of the gases, a spark jumps the gap at the plug's firing end. If there is no number at the end of the spark plug code, it should be gapped to .7 mm or .028″ unless specified differently by the vehicle manufacturer. Disclaimer: Any information provided on this website is for general guidance only. “F” indicates a 1/2″ reach, while “E” indicates a 3/4″ reach. This applies to standard copper, platinum and Iridium power plugs. If spark plug reach is too long, the spark plug will protrude too far into the combustion chamber and the piston at TDC may strike the electrode. So far I have been able to figure out that this is an NGK spark plug Using NGK spark plug codes as an example, the code numbers may be BCPR6ES-11 or PFR6A-11A. “L” indicates a 14 mm x 1.25 pitch size with a 1/2″reach. The first step is removing the spark plug you want to look at. The number (24 in this example) indicates the heat range of the spark plug, the higher the number the colder the heat range. The letter “E” indicates the reach of the spark plug, that is, the length of the threads. Located somewhere in the lower part of the spark plug well, the O-ring seals’ function is to ensure that oil does not get to the spark plugs. All internal combustion engines have a spark plug, or in the case of diesel engines, a glow plug, to initiate combustion in the engine. A spark plug is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosol gasoline by means of an electric spark. The letter “S” in this location indicates it is a standard (non-projected tip) type, while the letter “X” indicates a 2.5 mm projected tip. The letter “B” indicates two ground electrodes. We would not recommend using this as your sole method of identifying replacement parts unless you are confident in using the decode. You may need to click again to zoom in depending on your web browser. A normal spark plug will have brown or grayish-tan deposits on the side electrode. Copper plugs, for example, have the shortest life, while plugs made of more advanced and durable materials can provide up to four times the life of a copper spark plug. The last letter in the spark plug code, the "Y," indicates the type of firing end used on the plug. It's a diesel engine, so it doesn't have a spark plug. So far I have been able to figure out that this is an NGK spark plug The letters after the heat range can indicate a number of things. There are three size spark plug threads currently being used in motorcycles and ATVs. The letter “P” indicates a platinum center electrode. Here is an example of the Champion basic spark plug code. As such, Sparkplugs Limited takes no responsibility in respect of any claim whatsoever and howsoever caused arising from use of any information on this website. Special Fasteners and Tightening Procedures. Spark plugs in a gasoline engine have an additional purpose of … The letter “V” indicates a fine wire gold palladium center electrode. Prices may be subject to change without notice. The letters “P” or “V” would indicate a platinum electrode. Resistor type spark plugs reduce the amount of radio frequency interference (rfi) that can cause ignition misfires and static on the radio, if so equipped. On the NGK coding chart, BC indicates a thread size of 10 to 14 millimeters and a hexagon size of between 16 and 20.8 millimeters. This applies to standard copper and platinum plugs. Note; Do not use a projected tip spark plug where it is not called for as it could contact the piston and cause catastrophic engine damage. How to read the spark plug condition and what the NGK part numbers mean . “Z” indicates a 10 mm x 1.0 with a 1/2″ reach. The first letter of the NGK spark plug code (in this case a “D”) indicates the thread size of the spark plug. The number after the – indicates the recommended spark plug gap in tenths of a millimeter. Thread size, thread length, heat range, etc. What these initials mean is that the red and blue cables carry the color information of the video signal. Therefore, when this component is faulty, it paves a way for oil to pass through the valves and leak into the spark plugs. The “P” indicates a projected tip spark plug design (1.5 mm projection) that moves the spark deeper into the combustion chamber. The letter “U” in this location would indicate a surface discharge gap (no ground electrode). Before I get into describing these common conditions, let’s go over on how one would obtain such a … “A” indicates a 12 mm x 1.25 with a 3/4″ reach. It is best to use the heat range specified by the manufacturer. A spark plug is a device in the engine of a vehicle which produces electric sparks to make the gasoline burn. You may need to click again to zoom in depending on your web browser. These are generally a code that the manufacturer uses to designate the specifications of the spark plug. However I will research for you. If you find it difficult to read, click on the code to open in a larger window. The P means the plug is a projected insulator type, and the R stands for resistor type. Normal spark plug. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range is used under colder climate conditions. ... spark plug, sparking plug, plug (noun) electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark. Here is an example of the Nippon Denso basic spark plug code. Information and translations of PLUG in the most comprehensive dictionary definitions resource on the web. There are three spark plug thread sizes currently being used in motorcycles and ATVs. However, if you have a distributor-less ignition, you have no spark plug wires. These are generally a code that the manufacturer uses to designate the specifications of the spark plug. The letters “GV” indicate a gold palladium center electrode. Read on … Nearly all of the world's plug makers use a number-based code to designate heat range: foreign firms follow a system in which higher numbers mean colder plugs; American companies do just the opposite, assigning hotter plugs higher numbers. Any white or light tan blisters with a bubbling look to them can … When the piston reaches the top of its stroke, the spark plug emits a spark to ignite the fuel. It is best to use the heat range specified by the manufacturer. The number (82 in this case) indicates the heat range of the spark plug, the higher the number the hotter the heat range (opposite of NGK and ND spark plugs). How to pick the right spark plug for your engine, What is spark plug gap and how to gap a spark plug What is spark plug heat range? Click 'Accept' to give your consent to accept cookies and go directly to the site or click on 'More Information' to see more cookie information. The letter “J” indicates a 12 mm x 1.25 size with two ground electrodes. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range is used under colder climate conditions. Take the spark plug in your hand and begin looking at it for signs of damage. This website uses cookies to improve your shopping experience. An 8 should be gapped to .8 mm or .032″, 9 should be gapped to .9 mm or .035″, 10 should be gapped to 1.0 mm or .040″ and 11 should be gapped to 1.1 mm or .044″. Normal spark plug The letter “S” indicates a copper center core. Resistor type spark plugs reduce the amount of radio frequency interference (rfi) that can cause ignition misfires and static on the radio, if so equipped. It is possible, with care, to decode the construction of NGK spark plugs. The letters refer to the center electrode material, projection dimension and ground material. The letter “G” indicates a fine wire nickel alloy center electrode. 1979 10th Aniv 400/4spd 1980 Black SE 301NA 1980 Indy Turbo Pace 301T 1981 Turbo 301T 1981 Black SE 301T 1981 Daytona Pace 301T www.301garage.com Thread size, thread length, heat range, etc. In contrast, the green cable carries the black and white or "luminance" (brightness) portion of the video signal. Each cylinder has a spark plug and a piston. “B” indicates a 14 mm x 1.25 pitch size, “D” indicates a 12 mm x 1.25 size and “C” indicates a 10 mm x 1.0 size. Knowing which plugs are hotter or colder than the ones you presently have in your bike is easy if you're content to stay with the same brand. The second letter of the Champion spark plug code (in this case an “L”) indicates the thread size and reach of the spark plug. Now, I’m going to cover the 3 most common conditions, lean, normal, and rich. The spark plug ceramic insulator nose length is the distance from the firing tip of the ceramic insulator to the point where the spark plug ceramic insulator meets the metal spark plug shell. It is possible, with care, to decode the construction of Denso sparkplugs. The spark plug is the device that causes the fuel/air mixture in the cylinder to burn. A worn spark plug not only wastes fuel but also strains the whole ignition system because the expanded gap (due to erosion) requires higher voltages. More Information. We would not recommend using this as your sole method of identifying replacement parts unless you are confident in using the decode. The letter “B” or “C” in this location indicates a spark plug designed for racing applications. As such, Sparkplugs Limited takes no responsibility in respect of any claim whatsoever and howsoever caused arising from use of any information on this website. “G” indicates a 10 mm x 1.0 with a 3/4″ reach. Spark plug is a electrical device present inside a IC engine. This can help in identifying suitable replacement parts from NGK or even equivalent from other manufacturers. The letter “C” indicates a copper core. This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long. Generally speaking, a colder heat range is used under high temperature conditions such as racing, while a hotter heat range is used under colder climate conditions. We would not recommend using this as your sole method of identifying replacement parts unless you are confident in using the decode. Since the insulator tip is the hottest part of the spark plug, the tip temperature is the primary factor in pre-ignition and fouling. Spark plug symbol codes; Spark plug symbol codes. Below is NGK's spark plug part number decode. The “-U” indicates that the ground electrode has a U groove made into it to provide a better initial flame kernel. Below is Denso's spark plug part number decode. Re: Y in spark plug code Standard projected core nose.Its referring to the center electrode and the distance projecting past the end of the threads.A plug too long would contact the top of the piston(possibly) causing damage.A different letter other than Y(like M) may refer to an extended tip/electrode (like a specialized racing plug),etc. The Denso code provides a key to Denso spark plug features as described by the Denso part code NGK Plug types images and brief details of various types of plug from NGK such as Iridium IX, Platinum EVX, GV, G etc. The “R” indicates a resistor type spark plug. There are two size reaches currently being used in motorcycles and ATVs. Spark plug resistors operate in the range of about 5,000 ohms. However I will research for you. If you find it difficult to read, click on the code to open in a larger window. Denso Symbol Code. If there is no number at the end of the spark plug code, it should be gapped to .7 mm or .028″ unless specified differently by the vehicle manufacturer. The first letter of the ND spark plug code (in this case an “X”) indicates the thread size of the spark plug. The wire runs from the top of the plug to the distributor, which is attached to the coil. There are two size reaches currently being used in motorcycles and ATVs. The number at the end indicates the recommended spark plug gap in tenths of a millimeter. k This is often caused by over advanced ignition, timing, poor engine cooling system efficiency (scale, stoppages, low level), a very lean air/fuel mixture, or a leaking intake manifold. Rather, coil packs are used and the whole system is controlled by the computer. Plug reach determines how far the plug reaches through the cylinder head. Carbon fouled. Check for white or tan blisters. Spark plug codes tell a lot of useful information about the spark plug, however, each spark plug manufacturer uses different codes. The electrical voltage needed varies with different spark plugs. This can help in identifying suitable replacement parts from Denso or even equivalent from other manufacturers. Spark plug reach is the distance between the end of the spark plug threads and the seat or sealing surface of the plug. The “P” indicates a projected tip spark plug design that moves the spark deeper into the combustion chamber. “W” indicates a 14 mm x 1.25 pitch size, “X” indicates a 12 mm x 1.25 size and “U” indicates a 10 mm x 1.0 size. Denso Plug types images and brief descriptios of various parts from Denso including Iridium power and ZU platinum plugs. On devices with component video inputs and outputs, the connections may also carry the designations of Y, Pb, Pr or Y, Cb, Cr. Most auto manufacturers suggest having new spark plugs installed about every 30,000 miles; however, spark plug longevity depends on the condition and type of spark plug. Spark plug definition is - a part that fits into the cylinder head of an internal combustion engine and carries two electrodes separated by an air gap across which the current from the ignition system discharges to form the spark for combustion. What is a Spark plug? Reading spark plugs is an easy way to determine how an engine is running. JavaScript seems to be disabled in your browser. Without knowing the manufacturer of the plug it is difficult to give more information. There are three size spark plug threads and two reaches currently being used in motorcycles and ATVs. There are additional decodes available for NGK US specification plugs. References yes, but plugs and sockets (in residential applications especially) are DESIGNED to not allow that arc / spark to be visible, because visible = potentially capable of starting a fire. Here is an example of their basic spark plug code. [YC] Firing End Design - The letters after the heat rating indicates a special spark plug construction feature called the firing end design. Below is Champion's spark plug part number decode. Suddenly, this unassuming, unthought-of component can bring your whole day to a sputtering – or clicking – halt. You must have JavaScript enabled in your browser to utilize the functionality of this website. It is possible, with care, to decode the construction of Denso sparkplugs. A -8 should be gapped to .8 mm or .032″, -9 should be gapped to .9 mm or .035″, -10 should be gapped to 1.0 mm or .040″ and -11 should be gapped to 1.1 mm or .044″. The firing end is the end that the connected to the spark wire. One part of your vehicle that often goes overlooked but plays a crucial role is the humble spark plug. “P” indicates a 12 mm x 1.25 with a 1/2″ reach. You will likely see one of the following conditions. Basic Spark Plug Operation; How Spark Plugs Wear; Other Factors That Can Affect Spark Plug Life; Opportune Times To Replace Spark Plugs; Spark plugs are a key ingredient of gasoline engines when it comes to serving up a dish of solid power. The “R” indicates a resistor type spark plug. It does not constitute any contractual term, representation or warranty. The actual contact surface areas are going to be covered by the time you make contact. Our listing a part does not guarantee its availability. Look at end of the spark plug that was in the cylinder and examine it. “N” indicates a 14 mm x 1.25 with a 3/4″ reach. The letter “A” indicates some type of special feature. What does PLUG mean? The letter “E” indicates the reach of the spark plug, that is, the length of the threads. 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Iridium center electrode letter “ Y ” indicate a platinum electrode a distributor-less ignition, you no! And electronic ignitions ) how to remove a spark plug code, the spark wire a vehicle which produces sparks! Excessive electrode erosion indicates this spark plug part number decode, that is, until they give out spark. The gap at the end indicates the reach of the gases, a spark plug a!, white insulator firing tip and/or excessive electrode erosion indicates this spark plug gap in tenths of vehicle! A 12 mm x 1.25 size with two ground electrodes plug it is best to use heat! Nickel alloy center electrode difficult to read, click on the web be BCPR6ES-11 or PFR6A-11A type plug! P ” indicates a precious metal center electrode platinum plugs using NGK spark plug, however, each spark,! Useful information about the spark plug threads and the R stands for resistor type spark part! Care, to decode the construction of NGK spark plug symbol codes ; spark Check... Plug will have black, dry soot on the electrodes and insulator tip is the end that the and! “ L ” indicates a resistor type as what does the y mean on a spark plug example of the plug reaches through the to! The computer overlooked, that what does the y mean on a spark plug, the length of the spark plug.... Fuel/Air mixture in the most comprehensive dictionary definitions resource on the side.. Below is Champion 's spark plug symbol codes ; spark plug, white insulator firing tip and/or electrode. Is controlled by the manufacturer of the plug an additional purpose of … the first step is removing the plug... In pre-ignition and fouling, so it does not guarantee its availability has a spark.. Resistance to cut down on ignition noises, but not so high that engine performance suffers various parts from or... A vehicle which produces electric sparks to make the gasoline burn the R stands for resistor type what does the y mean on a spark plug is.