BK: 14 mm gevind, 16 mm tændrørsnøgle
R: Resistor type
6: Hvor varme/kolde rørerne er. 2 er koldest og 12 er varmest (* Forklaring længere nede)
E: Længden på gevindet, 19mm
-11: Afstanden er 1,1 mm ved levering (kontroller dog altid med et søgerblad).
*NGK's forklaring på varme/kolde rør:
[quote]Heat range
The term spark plug heat range refers to the speed with which the plug can transfer heat from the combustion chamber to the engine head. Whether the plug is to be installed in a boat, lawnmower or racecar, it has been found the optimum combustion chamber temperature for gasoline engines is between 500°C–850°C. When it is 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 which cause fouling.
The spark plug can help maintain the optimum combustion chamber temperature. The primary method used to do this is by altering the internal length of the core nose, in addition, the alloy compositions in the electrodes can be changed. This means you may not be able to visually tell a difference between heat ranges. When a spark plug is referred to as a “cold plugâ€
