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11 maj 2018 · This is a comparison of a cold heat range plug (left) versus a much hotter heat range plug (right). Notice how the distance between the ceramic and the spark plug shell on the hotter plug requires heat to travel a farther distance, which maintains more heat in the spark plug.
1 paź 2004 · Spark plug heat range is a function of your driving conditions. For all Corvette SBs regardless of power rating or type of ignition, AC heat range "5" or equivalent is best for street and highway driving. They are also okay for drag racing. For race track hot lapping AC heat range "3" or equivalent should be installed. Duke
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.
Using the correct heat range is key to getting the performance you want out of your engine. For most vehicles, the manufacturer-recommended spark plug and heat range is the best option. Consult your owner’s manual for the right spark plug for your car.
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.
When using this guide, understand that high performance sparks plugs are usually of a much colder heat range than normal automotive or street plugs. Colder heat ranges must be used in engines with increased cylinder pressures and temps and higher brake-specific power output.
1. Stay cool enough to avoid pre-ignition and/or electrode destruction. 2. Run hot enough to burn off combustion deposits that would otherwise collect at the firing tip. 3. Adapt to specific engine characteristics and widely varying driving/load conditions.
