Knocking
Knocking is a phenomenon that occurs in reciprocating engines, where the fuel-air mixture in the combustion chamber ignites spontaneously before the spark plug fires. This can cause a knocking or pinging sound, which can lead to engine damage if left unchecked. Knocking is caused by a combination of factors, including high cylinder pressure, high temperature, and low fuel quality. To prevent knocking, engines are designed with knock sensors that detect the sound and adjust the ignition timing to prevent further knocking. Additionally, higher octane fuels are less prone to knocking, as they have a higher resistance to spontaneous combustion.
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