Answer Posted / karthick
knocking means a large sound pulsations heard inside the
engine cylinder.knocking occurs due to
detonation.detonation occurs due to the unburnt carbon left
out inside the engine cylinder.the unburnt carbon is
already in high temperature before the actual compression
cycle starts.when compression starts,its temp and pressure
is once again raised to peak value.as a result of this the
last part of charge collide with the first part and results
in detonation.
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