A waste spark ignition system fires two spark plugs simultaneously from a single coil. One plug ignites the air/fuel mixture during the compression stroke and the other firing during the exhaust stroke. This creates a “wasted spark” that serves no purpose. This system, common in distributorless ignition systems (DIS). It simplifies ignition by pairing companion cylinders (e.g., 1 & 4, 2 & 3 in a 4-cylinder) and eliminates the need for a distributor. As a result, reducing parts and increasing reliability.
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