Quote:
Originally Posted by Coplay@180
What exactly could be the cause of knocking in engines? at lower rpms like 4-4.5k
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at low rpm when the throttle is partially open,the ignition timing is retarded.the flame front from the spark plug travels slowly.as a result,there are two individual seperate combustion inside the chamber,one near the spark plug and other at the very extreme end of the cylinder.as a result of two seperate combustions,we hear two distinct sounds in a single cycle of piston operation.thus the "knocking" term is used to describe the effect.