High Energy C.D. Ignition with Surface Gap Spark Plugs for Improved Ignition in Two-Cycle Engines

A High Energy C.D. Ignition system has been developed that is capable of operating surface gap spark plugs with excellent results. Surface gap spark plugs have existed in various forms for many years, and ignition systems of various forms have been developed, attempting to fire them, using both Inductive Discharge and Capacitive Discharge types of ignition. It has been shown that an Inductive Discharge spark with its low peak spark current and slow voltage risetime will not operate a surface gap spark plug. A high energy C.D. spark, with its rapid release of power and fast voltage risetime is necessary to keep a surface gap plug clean for extended periods. The first application for this ignition system has been on snowmobile engines.