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May 11, 2018 · Hot vs. Cold Spark Plugs. Let’s first define what is a hot versus a cold plug. Looking at a spark plug center ceramic insulator, if the area between the ceramic and the spark plug outer steel shell is deep, that is a hotter heat range plug.
The spark plug is heated during combustion and must dissipate that heat to the cylinder head at a certain rate to avoid overheating the ceramic firing end. The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine.
Spark plugs with high heat dispersal are referred to as cold, while plugs with less heat-dissipating characteristics are known as hot. The structure of the spark plug affects the heat rating: Length of insulator nose; Surface area; Material of center electrode; Position of the insulator tip; Hot Spark Plugs
Automotive & Small EngineGeneral & Industrial Engines1995189117901286- Marlan Davis
- 4 min
- Air/Fuel Mixture: Lean air/fuel ratios raise cylinder-head temperatures, requiring a colder plug. Rich air/fuel ratios require a hotter plug to prevent fouling.
- Spark Advance: Ignition timing has one of the greatest effects on heat-range choice. Advancing timing raises combustion temperatures, calling for colder plugs.
- Compression Ratio: Increasing the mechanical compression ratio raises cylinder pressure, resulting in higher cylinder temperatures. The higher the compression ratio, the colder the spark plug needs to be.
- Gasoline Quality: With leaded fuels, the lead is attracted to the hotter (core-nose) part of the plug, causing glazing; running a slightly colder plug helps prevent this.
The heat range of a spark plug refers to its ability to manage heat. The ideal heat range maintains the spark plug's tip at the perfect temperature to burn off deposits without causing damage. Different engine designs require different amounts of this heat transfer.
Jun 28, 2024 · The heat range of a spark plug refers to its ability to dissipate heat from the combustion chamber, with lower numbers indicating hotter plugs and higher numbers representing colder plugs.
May 20, 2011 · In broad terms, spark plugs are often referred to as “hot plugs” or “cold plugs.” A cold plug has a shorter insulator nose length—the distance from tip to spark plug shell—and transfers heat rapidly from its firing tip to the cylinder head water jacket.
