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Alfa romeo 156 Coil pack

Alfa romeo 156 Coil pack's are a call or a click away with Find a Part. Fill in the free car parts request form, or give us a call on the Premium rate phone line. We will then contact selected Alfa romeo 156 coil pack suppliers throughout the UK, who will contact you if they have the Alfa romeo 156 Coil pack you need.

Coil pack

A coil pack transforms the low voltage of a battery into the high voltage needed by spark plugs to start your car. In older vehicles a single (large) coil would serve all the spark plugs via the ignition distributor. In modern automobiles, the distributor is omitted and ignition is instead electronically controlled. Much smaller coils are used with one coil for each spark plug, or one coil serving two spark plugs, e.g. two coils in a four-cylinder engine, or three coils in a six-cylinder engine. These coils may be remote-mounted or they may be placed on top of the spark plug. This is known as coil-on-plug or Direct Ignition.

Where one coil serves two spark plugs (in two cylinders), it is through the "wasted spark" system. In this arrangement the coil generates two sparks per cycle to both cylinders. The fuel in the cylinder that is nearing the end of its compression stroke is ignited, whereas the spark in its companion that is nearing the end of its exhaust stroke has no effect. The wasted spark system is more reliable than a single coil system with a distributor, and is also cheaper than coil-on-plug.

Where ignition coils are automatically mounted they may all be contained in a single moulded block with multiple high-tension terminals. This is commonly called a coil-pack.

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