Whether the plug is to be installed in a boat, lawnmower or race car, it has been found the optimum combustion chamber temperature for gasoline engines is between 500°C–850°C. One of the most misunderstood aspects of spark plugs is its heat range. It is believed by many that the heat range measures spark temperature or intensity. When making spark plug heat range changes, it is better to err on the side of too cold a plug.
Performing too many modifications or tune-ups at once will lead to misleading and inaccurate conclusions if any issues occur (an exception would be when the alternate plugs came as part of a single pre-calibrated upgrade kit). For example, a 10 heat range in NGK is not the same as a 10 heat range in Champion nor the same in Autolite.Some manufacturers numbering systems are opposite the other - for Champion, Autolite and Bosch, the higher the number, the hotter the plug. (C) Copyright 2020
In identical spark plug types, the difference from one full heat range to the next is the ability to remove 70°C to 100°C from the combustion chamber.The heat range numbering system used by spark plug manufacturers is not universal. However, for NGK, the higher the number, the colder the plug.It is not recommended that you make spark plug changes at the same time as another engine modification, such as injection, carburetion or timing changes.
LOOKING FOR WHOLESALE PRICING? For example, a 10 heat range in NGK is not the same as a 10 heat range in Champion nor the same in Autolite.
Customer Service Often hotter heat ranges have been used to attempt to correct an underlying fuel or oil consumption problem; this is merely a cover-up fix and the underlying issues will ultimately have to be addressed. One of the most misunderstood aspects of spark plugs is its heat range. Sign up for our newsletter Policies Running too cold a plug can only cause it to foul out, whereas running too hot a plug can cause severe engine damage. The heat rating of each NGK spark plug is indicated by a number; lower numbers indicate a hotter type, higher numbers indicate a colder type. One cannot change the temperature of how hot a fuel burns.A hot spark plug has an insulator design that will be slower to draw heat away from the plug tip (thinner insulator mass), whereas a cold plug has an insulator design that will be faster to draw heat away from the plug tip (thicker insulator mass). My Account In addition, the alloy compositions in the electrodes can be changed. This is incorrect as the heat range is actually a measurement of the plug’s ability to transfer heat away from the tip of the spark plug.
This is incorrect as the heat range is actually a measurement of the plug’s ability to transfer heat away from the tip of the spark plug. For a spark plug to function properly it must have a tip temperature hot enough to invoke self-cleaning, while remaining cool enough to avoid pre-ignition.For most vehicles, the factory recommended heat range is sufficient; however, on some modified or special-use engines, alternative heat ranges may be necessary. The heat range numbering system used by spark plug manufacturers is not universal. *When a spark plug is referred to as a “cold plug”, it is one that transfers heat rapidly from the firing tip into the engine head, keeping the firing tip cooler.
*A “hot plug” has a much slower rate of heat transfer, which keeps the firing tip hotter.An unaltered engine will run within the optimum operating range straight from the manufacturer, but if you make modifications such as adding a turbo or supercharger, increasing compression, timing changes, use of alternate fuels, or sustained use of nitrous oxide, these can alter the plug tip temperature, necessitating a colder plug.
This means you may not be able to visually tell a difference between heat ranges. Within that range it is cool enough to avoid pre-ignition and plug tip overheating (which can cause engine damage), while still hot enough to burn off combustion deposits that cause fouling.The spark plug design determines its ability to remove heat from the combustion chamber.
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