Engine Knock Sound - Explained

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What is the knocking sound coming from my engine? What is engine knock? Why is my engine making a knocking noise? Engine knock, or pinging, occurs when a separate pocket of air-fuel mixture ignites after the spark has ignited the air-fuel mixture within the combustion chamber. Engine knock can be prevented using higher octane fuels, retarding ignition timing, or by using a lower compression ratio, among other solutions.

Related Videos:
Octane Rating - http://youtu.be/cfhTTuxF6Mk
Tuning Ignition Timing - http://youtu.be/R1tPT7anjwk

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