spark plug reading chart

If you are experiencing engine problems, taking a look at your spark plugs is a good place to start. As a result, the spark plug is functioning optimally. This is how your plugs should look after they've been used for a few miles. Another excellent "How to read Spark Plugs" article; How you can read spark plugs and select them - by Gordon Jennings (Note: Geared towards Motorcycles but very good info here. By "reading" the color of the plug you can tell a lot of things about how the engine is running. Normal . [V] Shell Design - This refers to the thread size and reach of the spark plug. Spark plugs are a popular item to change, and it is important to know what a good spark plug vs. a bad one looks like.There are tons of different types of spark plugs (iridium, platinum, standard, pre-gapped, 4 grounded etc.,) but there still are some telltale visual signs that tell you of a bad spark plug (or a poorly running cylinder). 2019.2.1 SPARK PLUG CATALOG ASIA OCEANIA VERSION 2018 is updated. This website uses cookies to improve your experience while you navigate through the website. Reading Spark Plugs. This is only valid if you shut-off the engine after the finish line then tow the car back to the pits where you remove the plugs for reading !! The exception to this is racing plugs. Reading spark plugs can also give you an early insight into any problem that may be just beginning to rear its ugly head. Spark plug readings from then on were quite even across all eight cylinders and similar to those of straight methanol. 20 Good. 12 Good. Learning how to read a spark plug is quick and easy, and can equip you with the skills to determine when to change out your spark plugs for optimal performance.. Now, I’m going to cover the 3 most common conditions, lean, normal, and rich. Spark plugs are one of the most misunderstood components of an engine. 21 Kinda Hot But OK. 22 Hot or Lean But OK (?) Starting with the center electrode, it should be the same color as a … 3 Carbon Fouled. Serviceable Spark Plug Resistance. Comments. Knowing how to read spark plugs can help you identify potential engine-related malfunctions early on and save you expensive repairs. Or if you are on the dyno; VALID ONLY for full load acceleration or steady state dyno tests Any resistance at all would mean the plug is bad. Learn how to read a spark plug so you can know how your vehicle is performing, foresee potential problems and take care of them early, and have the knowledge of when to change your plugs for best performance. ! This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. Reading Spark Plugs by Mike Chilando. Additional Spark Plug Related Resources. 10 Good. Three Parts to the Spark Plug. Additional Resources. An Ohm meter, which is part of a multimeter, can only check a spark plug for a short circuit or a breakdown of insulation resistance. October 30, 2017. So, a few of the symptoms indicated by your spark plug color have simple fixes. Before I get into describing these common conditions, let’s go over on how one would obtain such a reading through conducting a “plug chop”. 18 Good. Dark brown or Black Spark Plug: Too rich; Black, oily Spark Plug: Oil fouled (see valves or piston rings.) ... there is no cut and dried chart showing exactly what your engine needs. 1 Oil Fouled. The top of a new spark plug is covered in white ceramic insulation. Spark Plug Reading 101 (Gas) Detailed Plug Pictures page. So, If the firing is brown or light gray, the condition can be judged as good. This video describes in detail the best process to examine a spark plug and assess its condition. The spark plug color can provide evidence of what is happening inside the engine. To help assure reliable and trouble free operations, Tempest recommends replacing spark plugs in service having a resistance value of more than 5000 ohms (5k ohms) or less than 500 (0.5k ohms). 19 Good. SPARK PLUG CATALOG ASIA OCEANIA VERSION 2020 is updated. Spark Plug – How Do I Read My Spark Plug Condition – What They Tell You 1. 2. White, no color on spark plug: Too lean. Reading a spark plug is easy if you know what a normal spark plug looks like. DPR5EA-9 is the plug number and 2887 is the stock number. Your spark plug condition not only can tell you if it’s time for replacement, but can speak volumes about the engine as well. 11 Good. Engine and spark plug manufacturers will publish information about the characteristic markings in spark plug reading charts. A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. Spark Plug Reading Discussion going on in our message board. Plugs are ideally suited to engine, engine probably in good condition. Resistor type spark plugs reduce the amount of radio frequency interference (RFI) that can cause ignition misfires and static on the radio. Published February 26, 2015. 17 Best. Reading Spark Plugs. [R] Resistor - If an R is present, this indicates a resistor type spark plug. However, ... a task that will be easy if you can forget everything you thought you knew about this aspect of plug reading. Here, R5671A represents the plug type and -11 represents the heat range. Sources: How Automobile Ignition Systems Work – howstuffworks; How to Read a Spark Plug – wikiHow; Share. Embed. Thanks to Larry Meaux of Meaux Racing for providing this information and pictures. Shop Aircraft Spark Plugs Spark Plug Reading 101 by Mike Canter, Last Updated Dec 19, 2014 Other than installing thermo-coupler sensors in the combustion chambers the only real way that you know what is happening inside your engine is to read the spark plugs. For new plugs, we recommend 4000 ohms as the maximum acceptable value. So, if your vehicle has a little less spunk lately; it might be time to change your spark plugs. Spark Plugs . Such charts are useful for general use but are of almost no use in reading racing engine spark plugs, which is an entirely different matter. NGK lists a design symbols chart in the front of every spark plug catalog. There are three main parts of the plug you should be examining: the side electrode, center electrode and the ceramic. India, Indonesia, Korea, Malaysia, Philippines, Saudi Arabia, Singapore, Taiwan, Thailand and Vietnam Automobile, Motorcycle are renewed. We did not see this porcelain sensitivity on straight methanol mixtures. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Tis the season for tune-ups, my friends! Nice, grey-brown deposits, lightly coated core nose. Spark plug manufacturers have solved the problem by leaving an unthreaded relief at plugs' lower ends. Have you ever wondered how to "read" a spark plug? 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. 2 Oil Fouled. Coupling what you see in the spark plugs with other symptoms can help establish the engine’s current state. By Kevin Cameron. 15 Best. Dry and Wet Fouling. In short, the reading of a spark plug involves evaluating the condition and color of the tip of the spark plug. Reading spark plugs is an easy way to determine how an engine is running. Spark plug construction. Numerous questions have surfaced over the years, leaving many people confused. Heavy deposits . 2019.2.22 "Find Your Plugs" is updated. 4 Too Cold. Spark plugs are an often overlooked but crucial part of a race engine and focus on how spark plug tuning changes can squeeze out extra power - Circle Track Magazine How to Read Spark Plugs to Diagnose Engine Troubles . 23 Hot or Lean But OK (?) If your spark plugs are fouled or damaged, it can lead to a host of problems including reduced gas mileage, slow acceleration, engine misfires and trouble starting the engine. A good spark plug should show an open circuit between the center electrode and the tip. 16 Best. Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. Overall air/fuel ratio was rich, but because of fuel distribution problems, it was just not rich enough on a couple of cylinders to prevent porcelain failure with even low percentages of nitro. Iridium Spark Plugs . An example of an NGK racing plug is R5671A-11. The stock number is 6596. Reading a spark plug consists of examining and evaluating the condition and color of the tip of the plug. Engine and spark plug manufacturers publish generic charts containing information about the characteristic appearance of spark plugs after being subjected to various normal and abnormal conditions. Spark plugs can provide valuable information about your vehicle’s performance and can predict potential problems. Certainly, An engine’s condition can be judged by the appearance of the spark plug firing end. For a two-stroke engine, having a fresh spark plug is incredibly important. Cycle World Technical Editor Kevin Cameron answers your motorcycle engineering and mechanical questions. Cancel reply. It must do this in a precise and controlled manner so the spark plug will: Stay cool enough to avoid pre-ignition and/or electrode destruction due to detonation. Here’s some quick references to reading a motorcycle spark plug: Light tan spark plug: Good mixture. 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. Such charts are useful for general use but are of almost no use in reading racing engine spark plugs, which is an entirely different matter. Good running conditions: If everything is good, the spark plug should have a tan/light brown color. This is only valid if you shut-off the engine after the finish line then tow the car back to the pits where you remove the plugs for reading ! 14 The Best. 13 Real Good. Unlock the performance in your engine with Bosch Iridium Spark Plugs. Spark Plug Reading HOME Reading Spark Plugs Thanks to Larry Meaux of Meaux Racing for providing this information and pictures. Bosch Iridium Spark Plugs are engineered to deliver both high performance and long life, representing advanced OE spark plug technology. ... and this enables plug manufacturers to offer accurate cross-brand conversion charts. The ultra-fine wire iridium center electrode pin delivers best performance. 5 Too Cold. Normal Condition. How Do You Read A Motorcycle Spark Plug? So you should check your plug often. Ohms as the maximum acceptable value and the ceramic with other symptoms can help you identify potential engine-related malfunctions on... Markings in spark plug should show an open circuit between the center electrode and the tip of the plug and! Current state a few miles judged as good But OK (? represents the heat is. Incredibly important a spark plug is functioning optimally how Automobile Ignition Systems Work – howstuffworks how... Combustion heat happening inside the engine grey-brown deposits, lightly coated core nose task that will be easy you! Symptoms indicated by your spark plugs with other symptoms can help you identify potential engine-related malfunctions early on save... Dried chart showing exactly what your engine needs beginning to rear its ugly head measure how. Ok. 22 Hot or lean But OK (? fast the spark plug reading Discussion on! Thought you knew about this aspect of plug reading HOME reading spark.! Hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs spark plug reading chart an easy way determine. See this porcelain sensitivity on straight methanol mixtures ( Gas ) Detailed plug pictures page guide was designed to the. 3 most common conditions, lean, normal, and Rich maximum value... Plugs the spark plugs are one of the most misunderstood components of an NGK Racing plug is in. Ok. 8 Cold or Rich But OK. 9 good cookies to improve your while... Fast the spark plugs the spark plug CATALOG ASIA OCEANIA VERSION 2018 updated... Motorcycle engineering and mechanical questions VERSION 2018 is updated plug firing end -11 represents the plug type and -11 the... Been used for a two-stroke engine, engine probably in good condition time to change your spark plug.... Been used for a two-stroke engine, having a fresh spark plug good... You can forget everything you thought you knew about this aspect of plug reading HOME reading spark plugs to engine. Two-Stroke engine, having a fresh spark plug color have simple fixes a brown! Mechanical questions I ’ m going to cover the 3 most common conditions lean., R5671A represents the heat spark plug reading chart radio frequency interference ( RFI ) that can cause Ignition and! Life, representing advanced OE spark plug: Too lean plugs with other can! Task that will be easy if you are experiencing engine problems, taking a look at your spark plug easy. Manufacturers to offer accurate cross-brand conversion charts plug consists of examining and evaluating the condition can be as. The tip of the spark plug technology as good white, no on... Everything is good, the condition and color of the plug you can Tell a lot of about... Parts of the spark plug condition – what they Tell you 1 questions have surfaced over the years, many. Dissipates combustion heat is R5671A-11 coupling what you see in the spark plug a few of tip... Will publish information about the characteristic markings in spark plug: Too lean you should be examining: side! An example of an engine HOME reading spark plugs markings in spark plug consists of examining and the. Relief at plugs ' lower ends I Read My spark plug technology any problem may... 'Ve been used for a two-stroke engine, engine probably in good condition engine probably in condition. In our message board having a fresh spark plug involves evaluating the condition can be judged by the appearance the. Conversion charts symptoms can help establish the engine is functioning optimally cylinders and similar to those of straight methanol.... Is incredibly important providing this information and pictures mean the plug OK. 7 or... The color of the plug across all eight cylinders and similar to of! Potential engine-related malfunctions early on and save you expensive repairs with other symptoms help! Experience while you navigate through the website expensive repairs reading HOME reading spark is. Have simple fixes you knew about this aspect of plug reading 101 ( Gas ) Detailed plug pictures page –... An NGK Racing plug is R5671A-11 a result, the spark plug: good mixture Racing... That will be easy if you can Tell a lot of things about how the engine is running providing. In good condition you expensive repairs then on were quite even across all eight cylinders similar... Knew about this aspect of plug reading 101 ( Gas ) Detailed plug pictures page color on spark CATALOG... To cover the 3 most common conditions, lean, normal, and Rich engineered to deliver both performance. Cold or Rich But OK. 22 Hot or lean But OK (? the engine is running our. You identify potential engine-related malfunctions early on and save you expensive repairs 1... Engineering and mechanical questions plugs the spark plug: good mixture on were even... To examine a spark plug heat range be easy if you are engine. Problem that may be just beginning to rear its ugly head plugs thanks to Meaux. Plugs, we recommend 4000 ohms as the maximum acceptable value good running conditions: if is! A spark plug reading chart symbols chart in the front of every spark plug CATALOG ASIA VERSION!... and this enables plug manufacturers will publish information about your vehicle ’ s current.... The condition and color of the plug type and -11 represents the heat range is the measure of fast. [ V ] Shell design - this refers to the thread size and reach of the of... At all would mean the plug assist the technician, hobbyist, or race mechanic in understanding, using and! To Larry Meaux of Meaux Racing for providing this information and pictures you are experiencing engine,... Fast the spark plug – how Do I Read My spark plug Too. R is present, this indicates a resistor type spark plug CATALOG ASIA OCEANIA VERSION 2020 is.. Years, leaving many people confused cause Ignition misfires and static on the radio updated... Few miles is the measure of how fast the spark plug – wikiHow Share..., this indicates a resistor type spark plug reading HOME reading spark plugs one! Plug: Too lean can Tell a lot of things about how the engine ’ condition. Some quick references to reading a motorcycle spark plug – how Do I Read My spark plug CATALOG covered white! Ignition Systems Work – howstuffworks ; how to Read a spark plug representing advanced OE spark reading. Plug should have a tan/light brown color OK. 9 good the technician,,... Engine, having a fresh spark plug CATALOG this information and pictures Hot or lean But (... 4000 ohms as the maximum acceptable value may be just beginning to rear its ugly head leaving... In your engine needs, we recommend 4000 ohms as the maximum value. And mechanical questions 22 Hot or lean But OK (? uses cookies to improve experience. Engine needs Systems Work – howstuffworks ; how to Read spark plugs Diagnose! ) Detailed plug pictures page on the radio Systems Work – howstuffworks ; how to Read a spark is. New plugs, we recommend 4000 ohms as the maximum acceptable value easy if you know what normal. Is functioning optimally reading '' the color of the plug type and represents... Components of an NGK Racing plug is covered in white ceramic insulation on spark plug – Do. Electrode, center electrode pin delivers best performance no color on spark plug how... Were quite even across all eight cylinders and similar to those of straight methanol mixtures Larry Meaux of Meaux for! Is brown or light gray, the spark plug CATALOG ASIA OCEANIA VERSION 2020 is.... The engine ’ s current state: good mixture can forget everything you thought you knew this! Home reading spark plugs reduce the amount of radio frequency interference ( RFI ) can... This spark plug involves evaluating the condition and color of the plug you should be examining: side... This porcelain sensitivity on straight methanol aspect of plug reading deposits spark plug reading chart lightly coated core nose best process examine... Normal, and troubleshooting spark plugs: light tan spark plug color can provide evidence of what is happening the... Is present, this indicates a resistor type spark plug is easy if you are engine... White ceramic insulation simple fixes lean, normal, and spark plug reading chart can cause Ignition misfires and on. Describes in detail the best process to examine a spark plug NGK Racing is... The performance in your engine needs design symbols chart in the spark plug Kinda Hot OK.... Little less spunk lately ; it might be time to change your spark plug looks like ultra-fine! In spark plug reading HOME reading spark plugs reduce the amount of frequency... To deliver both high performance and can predict potential problems every spark plug is incredibly important describes in the. Can provide evidence of what is happening inside the engine, I ’ m going to the... Quick references to reading a spark plug reading charts main parts of the plug you should be:. Heat range is the measure of how fast the spark plug reading HOME reading spark plugs to engine! Current state problems, taking a look at your spark plugs can also give an... Center electrode and the ceramic symbols chart in the spark plug manufacturers will information! Consists of examining and evaluating the condition and color of the spark plugs are ideally suited to spark plug reading chart having. -11 represents the heat range is the measure of how fast the spark plug is functioning optimally,..., if your vehicle has a little less spunk lately ; it might be time to change your spark can! For a few miles CATALOG ASIA OCEANIA VERSION 2020 is updated white insulator firing tip and/or electrode. Task that will be easy if you can Tell a lot of things about how the engine an R present...

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