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The spark knock zone is identified as the area where abnormal combustion occurs when prompted by excessive spark scatter. Curve A represents the proximity of maximum spark advance with time-based ignitions. With these systems, the necessity of leaving a broad buffer to not allow the engine to enter the spark knock zone during timing variations becomes apparent. Curve B is the area occupied with angle-based Opti-Spark ignition. The minimal scatter produced by this system allows for aggressive timing curves plotted to the edge of the SKZ. View Related Article
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