The component that transforms the mild 12-volt supply of the battery into the tens of thousands of volts required by the spark plugs to launch the small engine is the Volvo V50 Ignition Coil, which allows the small engine to start off cleanly and pull hard. It is at the intersection between the low-voltage primary side and the high-voltage secondary side, and it contains two copper windings around an iron core that are applied to store magnetic energy and release it as a burst of 15,000 to 40,000 volts each time the ECU switches current to the primary side. In previous Volvo configurations a single coil was fed to a rotating distributor, though more recent designs have changed to packs that discharge two cylinders simultaneously in a waste-spark pattern, with most current Volvo four-cylinder designs having a Coil-on-Plug design where each Ignition Coil is bolted directly to the spark plug and there are no high-tension leads. Both styles have the same physics, but pack differently; the distributor pack requires a cap, rotor, and long plug wires; the waste-spark pack has two or more coils in the same pack, whereas the COP pack provides each cylinder with its own slim tower, providing quicker voltage rise and improved combustion control. Overworking of an Ignition Coil and resulting misfires, rough idle, or a glowing warning lamp can be caused by heat, vibration, or stretched plug gaps, and therefore owners of a V50 should keep in mind that broken housings, corroded terminals, or high resistance are indicators. Regular checkups will make a Volvo run smoothly, efficiently, and responsively.
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