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An ignition coil is used in the ignition system of a spark-ignition engine to transform the battery voltage to the much higher voltages required to operate the spark plug(s). The spark plugs then use this burst of high-voltage electricity to ignite the air-fuel mixture .
It features some of the latest engine technology such as direct fuel injection, sintered camshaft lobes, thin-walled engine block, variable valve timing and lift for intake and exhaust valves, downstream oxygen sensors, exhaust manifold integrated into the cylinder head, exhaust gas recirculation and cooling, distributors coil-on-plug ignition ...
The coilpack fires the spark plugs in two cylinders simultaneously so for example 1&4/2&5/3&6 cylinders fire together, the spark plug in one cylinder on a compression stroke is where the power comes from, and the spark plug in the other cylinder on an exhaust stroke does nothing. Coils in a wasted spark system may be in pack form, or they may ...
16v: 154 kW (209 PS; 207 bhp) at 6,300 rpm — VW Golf Mk2 Limited 4WD (this version was a homologation special, and does not appear in any official parts catalogues) reference Sly, James (January–February 1990). "Development of the G-60". VW & Porsche magazine. pp. 52– 53.
Not all small engine ignition systems are CDI. Some engines like older Briggs and Stratton use magneto ignition. The entire ignition system, coil and points, are under the magnetized flywheel. Another sort of ignition system commonly used on small off-road motorcycles in the 1960s and 1970s was called Energy Transfer.
Since the early 2000s, many cars have used a 'coil-on-plug' direct ignition system, whereby a small ignition coil is located directly above the spark plug for each cylinder. This design means that high-voltage electricity is only present in the small distance between each coil and the spark plug.