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| Heat range |
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The characteristic of a spark plug indicating its capacity to dissipate the heat that it receives from the combustion chamber is called in this way. Each spark plug is manufactured with several different thermal degrees depending on the length of the insulation on the positive or central electrode. A short reach allows a better heat dissipation and the spark plug is considered cold. An long reach dissipates the heat slower and the spark plug is called hot. The thermal degree of a spark plug should be adapted to the characteristics of the engine and to the type of driving. It is usually indicated with a number. So. low numbers correspond to hot spark plugs and the high numbers to cold spark plugs.
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| Heating power |
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Energy available that a fuel can provide in the form of heat.
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| Heels |
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Part of a tyre that is in contact with the wheel. They possess a specific shape that allow the tyre to be hooked and create a pressure on the tyre profile where they are mounted. So the tyre is fixed in the wheel and guarantees transmission of the tensile stresses and braking. A badly fitted heel causes vibrations or shaking and affects the vehicle�s drive deforming the carcasa of the wheel.
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