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Which spark plug property is described by its heat range?

  • A.The rate at which it conducts heat away from the tip
  • B.The temperature of the spark, which is determined by the energy delivered by the coil and by the width of the gap
  • C.The gap width
  • D.The temperature at which the plug will begin to ignite the mixture without a spark being produced by the coil

Answer: A

Heat range describes the path length from the insulator nose to the shell and therefore how hot the tip runs. A plug too hot causes pre-ignition, which makes the last option describe a consequence rather than the definition. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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