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- A hot spark plug is a plug which transfers heat slowly from the firing tip into the engine head, keeping the firing tip hotter. Detonation (engine knocking) or disintegrate centre electrodes are too hot spark plug symptoms. Hot plugs are good for applications that operate mainly at low rpms.
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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.
- 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.
A spark plug’s heat range is the degree to which it disperses heat. 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.
Automotive & Small EngineGeneral & Industrial Engines1995189117901286The spark plug heat range only indicates the rate that the spark plug dissipates its firing end heat to the engine. A hotter heat range spark plug has an insulator design with a longer heat flow path to the metal shell of the plug.
Heat range is the measure of how fast the spark plug dissipates heat. It determines how well a spark plug can handle the heat inside your engine. It changes the temperature of the spark plug. If the heat range is too cold, the deposits will not burn off the tip and the spark plug will foul.
Jun 28, 2024 · Discover the mysteries behind spark plug heat ranges in vehicles! Unravel how they impact heat dissipation, combustion efficiency, and engine durability. Learn to choose the right range to prevent pre-ignition troubles and enhance performance.
Jun 28, 2014 · Ideally, the temperature at the spark plug tip gets hot enough to burn off deposits, but no so hot that it overheats or causes pre-ignition. If you find that the plugs become fouled from deposits (a condition known as “carbon fouling”), you might consider a hotter plug.
