Ignition Coils - Fiat Punto 2004 Training Manual

Fiat Auto S.p.A.
8-VALVE 1.4
FIAT PUNTO TRAINING OUTLINE
ENGINE After Sales Training

4.3.2 Ignition coils

Description
The coils are integrated into one single body secured to the engine head. They are of the
magnetic closed circuit type, i.e. made up of a plate pack, the core of which (made of silicon
steel interrupted by a small gap) carries both windings.
Operation
The windings are covered by a stamped plastic container and insulated by being immersed
into a epoxy resin and quartz compound that gives them outstanding dielectric, mechanic and
thermal properties, since they are able to withstand very high temperatures, too.
The vicinity of the primary to the magnetic core makes it possible to reduce the magnetic flux
loss, thus making the most of the coupling on the secondary.
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