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Which phenomenon limits how far ignition timing may be advanced?

  • A.Misfire
  • B.Backfiring through the inlet, which occurs when the spark arrives before the inlet valve has closed completely
  • C.Detonation or knock
  • D.Pre-ignition, which occurs when the mixture is ignited by a hot spot before the spark and is the same phenomenon

Answer: C

Advancing too far raises the peak pressure and the end gas detonates, producing the characteristic knock. Pre-ignition is a genuinely related but distinct phenomenon caused by a hot spot rather than by timing, which is why the second option is a near miss. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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