How is the temperature range of a spark plug determined?
The heat range is determined by the insulator nose length and its ability to absorb and transfer combustion heat, the gas volume around the insulator nose, and the materials/construction of the center electrode and porcelain insulator.In identical spark plug types, the difference from one heat range to the next is the …
How much heat does a spark plug produce?
The operating temperature of a spark plug is the actual physical temperature at the tip of the spark plug within the running engine, normally between 500 and 800 °C (932 and 1,472 °F).
What is the heat range of NGK Spark Plugs?
2-11
Typically the heat range for NGK Spark Plugs varies from 2-11. This number indicates the thermal characteristics of a spark plug, or how ‘hot’ or ‘cold’ a spark plug is. The term hot/cold is commonly used to describe whether a spark plug heats up easily (hot) or whether it provides resistance to heating up (cold).
How do I know what heat range my NGK Spark Plug is?
NGK indicates the heat range in the middle of the plug number. For example, BCPR6ES-11 has a heat range of 6. (The number after the “-“ is the gap.) Starting with part # BKR6E-11 (heat range 6), a colder plug would # BKR7E-11 (heat range 7), a hotter plug would be # BKR5E-11 (heat range 5).
What is a colder spark plug?
The term colder plug and hotter plug refers to how fast or slow the plugs transfers the heat from the tip. A colder plug transfers heat faster while a hotter plug is slower. This temperature range is cool enough to prevent knock and not melt the plug tip, but still hot enough to burn off the carbon and prevent fouling.
How do you read a spark plug code?
“A” indicates a 12 mm x 1.25 with a 3/4″ reach. “Z” indicates a 10 mm x 1.0 with a 1/2″ reach. “G” indicates a 10 mm x 1.0 with a 3/4″ reach. 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).