Pencil coils are used in vehicles with a fully electronic ignition. They
are attached directly to the spark plug. With this coil type the
high-voltage pulse is generated directly at the spark plug. The
advantage: There is essentially no cable loss.
In addition, this
compact design provides for valuable additional space - which is
particularly important in modern engines - since the spark plug shaft
and ignition coil would otherwise take up this essential space.
Due
to its installation position directly in the cylinder head, however,
this ignition coil type is subjected to higher thermal loads and often
subjected to more vibrations.
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