General Studies · IC Engine Combustion
The phenomenon of 'knocking' or detonation in spark-ignition (petrol) engines is primarily caused by:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Excessive lubrication in the cylinder wall
- 2Perfectly timed spark delivery
- 3Extremely low operating temperatures
- 4Pre-ignition or auto-ignition of the unburnt end-gas fraction✓
Correct answer
Pre-ignition or auto-ignition of the unburnt end-gas fraction
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