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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.
- Hot vs Cold Spark Plugs: Design Difference
- Hot Spark Plugs
- Cold Spark Plugs
- Which Is Better?
Apart from igniting the engine fuel mixture, spark plugs also transfer heatfrom the combustion chamber to the outside. To be more precise outside here refers to the cylinder head. And the heat from the cylinder head is dissipated by the cooling system more easily. So first, a spark plug transfers heat from its tip to outside the engine. Second, eve...
As discussed above, hot spark plugs will have their spark plug tip maintained at high temperatures. As for how they do it is by having a long nose insulator slowing the heat transfer away from the tip. That’s the main key. The more insulation near the spark plug tip, the hotter will be the spark plug.The insulation kind of traps the heat in the cen...
Cold spark plugs do NOT have their tips maintained at high temperatures. The spark plug will have a short insulator noseand more conducting material, allowing the heat from the tip to transfer away easily. The short insulator nose will make the heat transfer difficult of course. But the tip temperature will be nowhere near as high as that of a hot ...
Both hot and cold spark plugs have their pros and cons. If the spark plug is too cold, there will be carbon buildupon the spark plug tip. The plug won’t be able to burn the buildup leading to a loss of spark plug energy. If, on the other hand, the spark plug is too hot, the engine could experience knocking, power loss, and pre-detonation, and can e...
A hotter heat range spark plug has an insulator design with a longer heat flow path to the metal shell of the plug. As a result, more heat stays in the ceramic firing end and less is dissipated to the engine. A colder heat range spark plug has an insulator design with a shorter heat flow path to the metal shell of the plug.
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.
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.
A hot plug is a spark plug whose ceramic insert has a smaller area of contact with the metal part of the plug than a cold plug has. Hot plugs allow less heat transfer from the ceramic and thus burn off more deposits. Meanwhile, cold plugs don't get as hot.
Autolite engineers have developed plugs in many heat ranges to suit all engine applications. They range from COLD through MEDIUM; and HOT to EXTREMELY HOT. Rules for selecting the correct plug are to follow manufacturer’s specifications. COLD MEDIUM HOT
