Ignition coils, supply the high voltage needed, to fire the spark plug.
Furthermore, because of changing technology, there are many types, for different systems.
Contrary to what you would think, coils are actually getting smaller. Because, they don’t provide spark, for all the cylinders at the same time.
So, the most common system, with multiple ignition coils, is the Coil-On-Plug (COP) system. Consequently, there is one coil per cylinder, with each one, connected to the spark plug.
As a result, much smaller coils are used, with one coil for each spark plug. Similarly, one coil, serving two spark plugs. For example, two coils in a four-cylinder engine, or three coils in a six-cylinder engine.
The last few decades have seen, great improvements in technology. As a result, various new coil types have been developed.
Some Of These Types Include:
In older vehicles and vintage cars, you might still see, what is commonly known as, a can-type coil.
For this type, the induced high voltage reaches the individual spark plugs, via a mechanically driven distributor.
So, ignition blocks contain, several coils. This coil type, is available with, single or dual spark technology.
Pencil or coil on plug (COP)
Consequently, the spark plug has the coil mounted on top of it. The high voltage pulse, is fed straight to the spark plug, to reduce power loss.
Ignition coil pack systems
Coil packs, combine a number of pencil coils, mounted within a single component, known as a ‘rail’.
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