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What Do the Letters and Numbers Mean on Champion Spark Plugs?

FAQs william September 21, 2022

The letters refer to center electrode material, protrusion dimension and ground material. [4] Gap Designation – The number following the heat output indicates the designation of the wide gap. Please note that the wide gaps are required to meet state and California requirements.

What do the numbers and letters on a spark plug mean?

The heat range of a spark plug is the range in which the plug functions well thermally. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate hotter type, higher numbers indicate colder type.

How do you read the numbers on a Champion spark plug?

Use this reference: It’s the number on the package label. On each Champion spark plug package, a label gives the short product code (e.g. OE220). This short code corresponds to the Champion technical code.

How do you read a spark plug letter?

Use this reference: It’s the number on the package label. On each Champion spark plug package, a label gives the short product code (e.g. OE220). This short code corresponds to the Champion technical code.

How do you know which spark plug is colder?

What does the Q stand for in Champion spark plugs?

“Q” Type: Uses a wire-wound induction coil (or electromagnetic suppression) to reduce RFI without negatively impacting ignition performance. “Q” style suppressor plugs are specified for most Evinrude and Johnson outboards with CDI.

How do you read a Champion spark plug heat range?

Champion indicates the heat range in the center of the candle number. For example, RV15YC6 has a heat range of 15. (The 6 at the end of this part indicates the gap setting.) Champion spark plugs are hotter the higher the number, colder the lower the number.

How are the spark plugs numbered?

The plug number is used to decode the spark plug and the stock number is used by our sales staff to assist with stock management as alphanumeric numbers are more difficult to inventory. The stock number is a random 3, 4 or 5 digit number and is not related to heat range or candle type. An example is: DPR5EA-9; 2887.

Is Champion qc12yc the same as rc12yc?

Premium Member. From what I can find, the two plugs have the same heat range, so are interchangeable with no difference in mechanical engine performance. BUT if you have a fuel injected engine you should use the QC connector.

What happens when you run too hot of a spark plug?

If the tip of the spark plug is too hot pre-ignition may occur which can cause detonation/knock and damage. If it is too cold, electrically conductive deposits can form on the insulator, leading to a loss of spark energy or to the actual short circuit of the spark current.

What is a plug number?

A plug number is a placeholder number used in an overall cost or budget estimate until a more accurate number can be determined.

How do I know my spark plug size?

When we say “spark plug size” we usually mean the diameter of the spark plug thread. The two most common spark plug sizes in modern motorcycles and small cars are 14mm and 18mm. Some car manufacturers also use 16mm high thread count spark plugs and 12mm long reach spark plugs.

What does MP mean on a spark plug?

SparkPlugs.com: Manufacturer’s Numbering Systems.

Does a hotter spark plug burn more fuel?

Air/Fuel Mixture: Lean air/fuel ratios increase cylinder head temperatures and require a colder spark plug. Rich air/fuel ratios require a hotter spark plug to avoid fouling. Mixtures that cause the spark plugs to read lean can contribute to pre-ignition or detonation.

What happens if you run a colder spark plug?

With changes in spark plug heat range, it is better to rely on a plug that is too cold. A spark plug that is too cold can only lead to fouling, while a spark plug that is too hot can cause serious engine damage.

What does 1 step colder spark plugs mean?

Why go “one step colder”? Running a “colder” heat range spark plug will lower combustion chamber temperatures by directing more heat into the cylinder head. This reduces feedback knocking and learning the subtle knocking when performing petrol tunes. Recommended for ALL 2.5 WRX/STI over 280 Whp.

What does R mean on a spark plug?

Resistance plugs help suppress spark plug noise, a valuable attribute in certain circumstances. Resistor spark plugs usually include an “R” in the part number for easy identification.

What is the gap on a Champion spark plug?

Determining the Proper Clearance Setting

Clearance setting is different for each vehicle, but most are somewhere between 0.028″ and . 060″. Consult the Champion owner’s manual or ® catalog to find the recommended setting for the vehicle you are working on.

What does a champion rc12yc spark plug fit?

Determining the Proper Clearance Setting

Clearance setting is different for each vehicle, but most are somewhere between 0.028″ and . 060″. Consult the Champion owner’s manual or ® catalog to find the recommended setting for the vehicle you are working on.

How do I choose a spark plug heat range?

The heat range of a spark plug is the range in which the plug functions well thermally. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate hotter type, higher numbers indicate colder type.

References:

  1. https://www.ngkntk.in/importance-of-heat-range/
  2. https://www.championpowersports.eu/assets/II-Partnumbering-structure.pdf
  3. https://www.youtube.com/watch?v=QXaSXj7RaII
  4. https://www.ngk.com/how-do-i-find-a-colder-or-hotter-plug-3
  5. https://www.sparkplugs.com/what-are-the-different-champion-resistor-types
  6. https://www.sparkplugs.com/how-do-i-find-a-colder-or-hotter-plug-7
  7. https://ngksparkplugs.com/en/resources/decoding-spark-plug-part-and-stock-numbers
  8. https://www.snowblowerforum.com/threads/qc12yc-vs-rc12yc.142010/
  9. https://www.gsparkplug.com/shop/spark-plug-heat-range
  10. https://www.homewyse.com/definitions/plug_number.html
  11. https://www.electronicshub.org/spark-plug-socket-size/
  12. https://www.sparkplugs.com/manufacturers-numbering-systems
  13. https://www.motortrend.com/how-to/10-factors-that-affect-spark-plug-heat-range/
  14. https://www.ngk.com/what-is-a-spark-plugs-heat-range-2
  15. https://boostcontrolledperformance.com/product/subaru-one-step-colder-spark-plugs/
  16. https://homeguides.sfgate.com/need-resistor-spark-plug-lawn-mower-101049.html
  17. https://www.championautoparts.com/Technical/Tech-Tips/Spark-Plug-Gap-Tip.html
  18. https://www.rcpw.com/rc12yc-spark-plugs.html
  19. https://ngksparkplugs.com/en/resources/spark-plug-basics

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