What Causes Engine Knock?

1 Answers
DiLeila
07/29/25 3:05pm
Reasons causing engine knock: 1. Overly advanced ignition before the piston reaches top dead center; 2. Excessive engine temperature; 3. Excessive carbon buildup in the combustion chamber; 4. Overly lean fuel-air mixture in the combustion chamber; 5. Fuel with excessively low octane rating. The solution is to use higher-octane fuel while paying attention to regular maintenance, frequently observing whether the engine exhibits abnormal phenomena, and addressing any issues promptly to prevent engine damage caused by knocking. When the engine inhales a mixture of fuel vapor and air, if the compression stroke fails to reach the designed ignition position while various uncontrolled factors cause the gas mixture to self-ignite, the tremendous impact force generated by this combustion acts opposite to the piston's movement direction, causing engine vibration. This phenomenon is known as engine knock.
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