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Which difference separates detonation from pre-ignition?

  • A.Detonation occurs at low speed and pre-ignition at high speed, which is the only distinction between them
  • B.They are identical
  • C.Detonation is audible and pre-ignition is silent, which is why the latter is far more dangerous to the engine
  • D.Detonation follows the spark; pre-ignition precedes it

Answer: D

Detonation is the spontaneous ignition of the end gas after the flame front has started, while pre-ignition ignites the charge before the spark arrives. Pre-ignition genuinely is quieter and more destructive, which makes the last option a real observation. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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