Thread: Wasted Spark
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Old 11-29-2020, 12:18 AM
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If I'm seeing this right, you're discharging all 4 coil outputs simultaneously yet not getting combustion at the bottom of the intake stroke, correct? Or maybe I'm missing something. Have you taken the system out for a sea trial?

We've talked about a wasted spark system before with the goal of eliminating the distributor but a mechanical advance mechanism on the crankshaft made the exercise more daunting than it seemed to be worth. Our scheme traded the complexity of the distributor for the complexity of the crank mechanism and we were looking at a twin double output coil system (necessitating two crank pickups 180° apart), wasting only the exhaust stroke spark in each cylinder. We limited ourselves by sticking with mechanical designs, the result of old school concerns of electronics in a marine environment over the long term.

Good on you for making a working prototype, I'm impressed.
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1977 Catalina 30
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prior boats 1987 Westsail 32, 1970 Catalina 22
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