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Which purpose does an ignition system serve?

  • A.Producing a spark at the correct instant in each cylinder
  • B.Igniting the fuel by compression, which raises the temperature of the charge above its self ignition point
  • C.Metering the fuel
  • D.Producing a continuous arc across the plug electrodes, which burns the whole of the charge during the power stroke

Answer: A

The system must deliver a spark of sufficient energy at a precisely timed instant to each cylinder in turn. Compression ignition belongs to the diesel engine. The spark lasts a millisecond or so rather than being continuous. Checking which component actually carries the load settles most questions of this kind at once. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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