*This is a replay from the old podcast series lost to the internet*
Original upload date: 21/07/2020
So what is the difference between coil over plug and distributor? Simplistically the difference is the number of ignition coils.
A distributor-based ignition has one coil for the whole engine using mechanical means to distribute the spark. This type of ignition does not require any electrical control and is reliable. However as RPM climbs the time between events shortens to the point which insufficient time exists for the coil to prepare the high voltage spark and ultimately spark strength suffers.
For coil over plug (coil on plug) which has more coils meaning less duty per coil. Spark strength is normally consistent across all engine speeds. Coil on plug requires an ECU to control the individual coils as well as a crank trigger and cam reference. If you are converting an ordinary distributor ignition to coil on plug, fitting these items may add additional cost opposed to fitting a CDI unit to your distributor system.
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6 сен 2024
