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- 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.
auto.howstuffworks.com/hot-cold-plugs-different.htm
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What is a hot spark plug and a Cold Spark Plug?
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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.
Speaking of temperatures, spark plugs come in two basic varieties: cold and hot. Cold plugs work best in high- horsepower high-compression engines. They have less insulation, so more heat can be transferred away from the combustion chamber to the outside of the engine.
- Kristen Hall-Geisler
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.
- Copper/Nickel Spark Plugs
- “Single Platinum” Spark Plugs
- Double Platinum Spark Plugs
- Iridium Spark Plugs
- Silver Spark Plugs
- Gapping Spark Plugs
- Spark Plug Heat Range
- "Replacement" vs. "Performance" Spark Plugs
Sometimes referred to as "standard" or "normal", copper spark plugsactually use a nickel-alloy coating for the electrode. Only the inner core itself is copper. This is because copper is a soft metal that would melt almost instantly if subject to the extreme heat that outer spark plug areas endure. Because of the construction of these types of plugs...
Spark plugs known as platinum feature a platinum center electrode. These are also described as “single platinum” plugs. Platinum-tipped spark plugsare more expensive because platinum is a more rare element in nature. Where platinum spark plugs shine is their great longevity under normal driving conditions. Platinum is harder than nickel alloy, so i...
While “single platinum” plugs feature a platinum center electrode, “double platinum” plugs use platinum plating on both the center electrode AND ground electrode. Although this type of plug represents a step up in price, they typically yield slightly higher performance along with the longer life that platinum plugs are known for. Another advantage ...
Iridium-tipped spark plugsoffer better power, more complete combustion that leads to smooth-running engines, and a longer lifespan than copper/nickel plugs. Depending on application, iridium plugs can even approach the lifespan of some platinum ones. Iridium plugs are highest in cost, and typically feature "fine wire" centers designed to conduct el...
Silver-tipped spark plugs have the best thermal conductivity. However, they do not feature the longevity of platinum or iridium. Generally, they’re specified in older European performance cars as well as some motorcycles. To this end, we’ve got the Bosch OE Specialty Silver Spark Plug.
"Gapping" refers to adjusting the distance between the curved conducting electrode and the plug tip where the electricity emanates from. This is done by bending the electrode itself via a special "gap tool". Achieving proper gap distance is important for maximizing the power output, fuel consumption, smoothness, and overall lifespan of your spark p...
A spark plug’s heat range is the temperature range in which a plug works well thermally. No matter what type of spark plug you choose, an optimal heat rating for your vehicle’s engine is important. If a spark plug gets too hot, the excess heat it retains can cause premature ignition of the air/fuel mixture (known as engine-damaging knock) during th...
Along the left-hand side of the screen in our spark plugs section, you’ll see check boxes for both “Replacement” and “Performance” plugs. Selecting either one of these boxes narrows your search accordingly. After that, it’s possible to select additional boxes to view replacement or performance versions of specific spark plug types (platinum, iridiu...
Dec 24, 2020 · How To Gap Spark Plugs: Explained In Simple Steps; Hot Spark Plug. 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.
Jun 25, 2024 · Hotter spark plugs are designed to burn off carbon deposits more effectively, making them suitable for stop-and-go driving conditions. In contrast, colder spark plugs are better at dissipating heat and preventing pre-ignition in high-performance engines or during sustained high-speed driving.