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The inductance values of the primary and secondary
winding are also different in the HEI coil. Inductance of
a coil is the ability of the coil to induce a counter-
voltage while carrying an increasing or decreasing
current (self-induction). This counter-voltage works
against the changing current trying to keep the current
wire from changing and is a limit-ing factor on the
maximum output of a coil. The increased secondary
inductance provides a higher voltage and a longer
spark duration than the conventional system.
The HEI system was developed as an integrated
package that combines the distributor, magnetic
pickup, ignition coil and electronic module into one
package. By doing this, these components are well-
protected from physical and environmental abuses
and the number of electrical connections are reduced.
There are some models that use a remotely mounted
coil. This coil is constructed the same as the integral
coil with the exception of a mounting bracket and a
terminal for the connection of a high tension lead.
131-064
Figure 6-8 Cap Size
The size of the distributor was increased due to the
wide spacing that must exist between the distributor
cap inserts to prevent high-voltage arc-over (figure 6-
8). A wider spacing was also needed between the cap
inserts and the distributor housing to prevent arc-over
and leakage to ground.
LP Engine G430 (3.0L)
The higher voltage output of the HEI system required
new insulation materials. To prevent igni-tion failure
due to carbon tracking, a special mater-ial is used for
the distributor cap and rotor. It is a thermoplastic,
injection-molded, glass-reinforced polyester. This
material provided the dielectric and insulation
properties needed and also prevented carbon
tracking.
The high voltage terminals used in the distributor cap
are similar in appearance to spark plug termi-nals.
These connections provide easier attachment and
better sealing of the connection.
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Igntion System
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