ngk spark plug chart

NGK Spark Plugs (U.S.A.), Inc. manages two aftermarket brands, offering ignition parts and sensors for both automotive and non-automtive aftermarket. EXCEPTION: NGK Racing Plugs: (Any NGK plug that begins with the letter “R”) For NGK Racing Plugs, the heat range is located AFTER the hyphen. Also affects the spark plug’s tip temperature, The higher the altitude, the lower cylinder pressure becomes. 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. Slight misfires can cause a loss of performance for obvious reasons (if fuel is not lit, no energy is being created), Severe misfires will cause poor fuel economy, poor driveability, and can lead to engine damage, Will occur when spark plug tip temperature is insufficient to burn off carbon, fuel, oil or other deposits, Will cause spark to leach to metal shell…no spark across plug gap will cause a misfire, Wet-fouled spark plugs must be changed…spark plugs will not fire, Dry-fouled spark plugs can sometimes be cleaned by bringing engine up to operating temperature, Before changing fouled spark plugs, be sure to eliminate root cause of fouling. document.write(kudos); This applies to standard copper and platinum plugs. For example, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. ), 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. (click picture), (Engine temperature can affect the spark plug’s operating temperature, but not the spark plug’s heat range). MEIYA (JS) (Torch) NGK DENSO CHAMPION AC AUTOLITE BOSCH A6TC U5BC A7T U20FS Z10 U4B A7TC C7HSA U22FS-U Z10YC S102F 2795 U4BC A7RTC CR7HS U20FPR RZ10YC U24BC D7 D7EA X22ES-U A8 S123XL X5C D8T X16EP A8Y X4D D8TC D8EA X24ES-U A8YC S121XL 275 X4DC D8RTC DR8EA X24ESR-U RA8YC XR4DC D8RTCS DR8ES E4TC BP4HS L95Y 517 … While every precaution has been taken in the compilation of this information, NGK Spark Plug (Australia) Pty Ltd takes no responsibility for inaccuracies that may occur within it. 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. Engineered to perform under the most extreme conditions, NGK glow plugs help your diesel engine get off to a fast and reliable start. 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. NGK Spark Plug Numbering Systems Wondering what the numbers and letters on an NGK spark plug mean? Thank you for reading. These NGK spark plug charts explain how NGK's numbering system works. we have found that the surface-gap plugs, while lasting longer, seem to have a slight performance hit over the standard plugs. 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. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. This means the plug has a higher internal temperature, and is said to be a hot plug. Most of the damage that an engine sustains when “detonating” is from excessive heat, The spark plug is damaged by both the elevated temperatures and the accompanying shock wave, or concussion, A spark plug is said to have misfired when enough voltage has not been delivered to light off all fuel present in the combustion chamber at the proper moment of the power stroke (a few degrees before top dead centre). Please review our Warranty, Returns & Refunds policies before you place an order. To contact them, click here. 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. 70°-100° C, Increases in firing-end temperature are proportional to engine speed and load. In all VRO-equipped motors, the "Q" type plug is recommended (Designated by "Z" in the plug number for NGK). The NGK spark plug finder helps find the right spark plug via the NGK spark plug codes. Part# NGK STK # NGK # Comp. Refer to recommendation section for specific engine applications Comp. we recommend ngk instead, and traditional electrode-gap rather than surface-gap plugs where possible. Below is NGK's spark plug part number decode. 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 . 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 spark plug application and information evinrude/johnson 1952-2010 evinrude/johnson motors ship with champion spark plugs. Please view the application guide below. NGK Spark Plugs BPM6A S25 - NGK Standard Series Spark Plugs Spark Plug, Resistor, Nickel Tip, Copper Core, 14mm Thread Size, 0.375 in. The heat range is defined as a plug’s ability to dissipate heat. The borderline between the fouling and optimum operating regions (500°C) is called the spark plug self-cleaning temperature. Since the insulator tip is the hottest part of the spark plug, the tip temperature is a primary factor in pre-ignition and fouling. This may lead to pre-ignition/detonation and expensive engine damage. Address: NGK SPARK PLUGS (ASIA) CO., LTD. Amata City Industrial Estate (Phase 10), 700/1006 M. 9, T. Mappong, A. Panthong, Chonburi 20160 Thailand Rather, the heat range is a measure of the spark plug’s ability to remove heat from the combustion chamber. The spark plug Cross references are for general reference only. Spark plugs are one of the most misunderstood components of an engine. Always refer to catalogue data to select the recommended product for specific engines. Most frequently caused by hot spots in the combustion chamber. 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. View full size version of NGK spark plug numbering chart. The temperature at this point is where the accumulated carbon and combustion deposits are burned off. A colder plug would be # R5671A-11 (heat range 11), a hotter plug would be # R5671A-9 (heat range 9). NGK SPARK PLUG prides itself on providing cutting-edge products, first-class expertise and technical know-how related to spark plugs, glow plugs, ignition coils and leads, oxygen, temperature, NOx and MAP/MAF sensors. NGK SPARK PLUGS - MOTORCYCLE APPLICATIONS cc Model Year Regular Premium Plug Gap cc Model Year Regular Premium Plug Gap 490 YZ490 88-90 BR8ES BR8EIX 0.032 490 YZ490 82-87 --- BR8EIX 0.024 500 SC500 73-74 BR8ES BR8EIX 0.024 500 SR500 80-81 BPR6ES BPR6EIX 0.032 500 SR500 78-79 BPR7ES BPR7EIX 0.032 500 TT500 76-81 BPR7ES BPR7EIX 0.032 //--> If the tip temperature is lower than 500°C, the insulator area surrounding the centre electrode will not be hot enough to burn off … NGK’s family of automotive products are driven by extreme dedication to innovation, performance and quality. From the high-tech Ruthenium HX™ to the industry standard OE-style spark plugs, NGK drives the future of spark plug engineering. We sell high quality NGK Spark Plugs for Tecumseh Engines and other replacement parts online. As humidity increases, air intake volume decreases. As temperature increases, air density decreases, as does intake volume, and fuel delivery should be decreased. NGK Part Finder. As the cylinder temperature decreases, so does the plug tip temperature, Many mechanics attempt to “chase” tuning by changing spark plug heat ranges, The real answer is to adjust jetting or air/fuel mixtures in an effort to put more air back into the engine, Defined as: ignition of the air/fuel mixture before the pre-set ignition timing mark, Caused by hot spots in the combustion chamber…can be caused (or amplified) by over advanced timing, too hot a spark plug, low octane fuel, lean air/fuel mixture, too high compression, or insufficient engine cooling, A change to a higher octane fuel, a colder plug, richer fuel mixture, or lower compression may be in order, You may also need to retard ignition timing, and check vehicle’s cooling system, Pre-ignition usually leads to detonation; pre-ignition and detonation are two separate events, The spark plug’s worst enemy! The experienced tuner can analyze these symptoms to track down the root cause of many problems, or to determine air/fuel ratios. /* script places appropriate city into page */ This catalogue lists only vehicles officially imported or manufactured in the UK and is effective from 3rd November 2020. You will likely see one of the following conditions. The world leader in spark plug technology for over 80 years. Don't just ask for a spark plug, insist on NGK. NGK spark plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance. Result is lower combustion pressures and temperatures, causing a decrease in the spark plug’s temperature and a reduction in available power. Technical. Therefore, it is impossible to chart an Autolite heat range hierarchy, let alone a standardized comparison to other spark plug brands. Whether the spark plugs are fitted in a lawnmower, boat, or a race car, the spark plug tip temperature must remain between 500C-850°C. 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. : domed pistons, smaller chamber heads, milling heads, etc. 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. This is detonation. The insulator nose length is the distance from the firing tip of the insulator to the point where insulator meets the metal shell. NGK Glow Plugs All NGK Glow Plugs are manufactured to the highest level of quality to ensure quick and consistent starts. 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. Search by application to find the part you need from NGK or NTK Wondering Air/fuel mixture should be leaner, depending upon ambient temperature. So we'll work time & material. Glow Plugs. Spark Plug Cross Ref. This is called “Thermal Performance”, and is determined by the heat range selected. The heat range numbering system used by spark plug manufacturers is not universal. There are three basic diagnostic criteria for spark plugs: good, fouled and overheated. Find out more. The colder type removes heat more quickly, and will reduce the chance of pre-ignition/detonation and melting or damage to the firing end. Spark plugs are the “window” into your engine (your only eyewitness to the combustion chamber), and can be used as a valuable diagnostic tool. Example: R5671A-10 has a heat range of 10. Hot spots will allow the air/fuel mixture to pre-ignite. Plugs are listed alphabetically by NGK plug number. All applications, illustrations and technical information detailed on this site have been assembled based on the latest information available. Use Cross References as a guide only. Champion Symbol Code. Fast shipping and great service! and material, plugs produced by various manufacturers do not have exactly the same heat range. Numerous questions have surfaced over the years, leaving many people confused. to get great parts for your outboard? art's at central warehouse, you'll get it next month. Look at end of the spark plug that was in the cylinder and examine it. Mastertech may make improvements to this site at any time. The temperature of the spark plug’s firing end must be kept low enough to prevent pre-ignition, but high enough to prevent fouling. We are not NGK Spark Plugs USA. NGK spark plugs push the limits of performance and innovation, bringing the most advanced technology to today’s high-efficiency engines. , 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. The following symptoms or conditions may have an effect on the actual temperature of the spark plug. When traveling at a consistent high rate of speed, or carrying/pushing very heavy loads, a colder heat range spark plug should be installed. NOTE: Cross references are provided as a guide only. Ancient Tools, Meet the MasterTech! Below is a list of some of the possible external influences on a spark plug’s operating temperatures. It is possible, with care, to decode the construction of Champion sparkplugs. A sufficient amount of voltage must be supplied by the ignition system to cause it to spark across the spark plug’s gap. There are additional decodes available for NGK US specification plugs. Normal spark plug If the piston can’t go up (because of the force of the premature explosion) and it can’t go down (because of the upward motion of the connecting rod), the piston will rattle from side to side. Conversely, a cold spark plug has a shorter insulator nose and absorbs more combustion chamber heat. Read full disclaimer. Glow Plugs. It does not list every available plug … 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. 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. platinum upgrade stock no. 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. (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). Any use of this cross reference is done at the installers risk. ,