1. Pre-ignition
  2. Detonation
  3. Ignition delay
  4. Auto-ignition
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1 Answers

Answer: Option 1

The ignition of the charge by some hot surface within the engine before the passage of spark is called Pre-ignition. Pre-ignition is a situation in which the fuel-air mixture in a spark ignition engine ignites before the timed spark, because of contact with a hot surface.

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