Distributorless ignition systems
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In a waste spark system, each spark plug is fired by a high voltage impulse from an ignition coil shared with a companion cylinder.
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Insulated coils
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In systems which employ an individual coil for each cylinder, the coils can be placed in an insulated cassette with each coil connected directly to its spark plug.
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| Distributorless ignition system timing |
The lack of moving parts compared with the mechanical system leads to greater reliability and longer service intervals. For older cars, it is usually possible to retrofit an EI system in place of the mechanical one. |
