Discussion
Which principle does a wasted spark system use?
Answer: A
One coil serves two cylinders whose pistons rise together, so one fires the mixture and the other sparks harmlessly into exhaust gas. That halves the number of coils and needs no camshaft sensor for ignition purposes. Checking which component actually carries the load settles most questions of this kind at once. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Tracing the requirement back to the physical constraint that produces it makes the answer follow.
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