Answer / madhav vishwakarma

Knocking are created and piston get damage also unwanted noise created.

Answer / stub

Engine will work normally, some advance is required because it takes time for the flame front and compression wave to travel from the spark plug to the piston face.

However, if the advance is too great than knocking will occur with noise and possible damage.

Pre-ignition is where a cylinder is too hot, compression is to high or has excess deposits in it that cause the the mixture to ignite before the spark with teh same ill effects.

Answer / nishantsingh

It get pre ignite and bcoz of this knocking occurs,this would damage connecting rod and crank shaft.

Answer / himanshu mishra

will cause detonantion
which means unveven or abnormal combustion
lead to
unburnt gases
more maintenance
more carbon residue
more harm to nature
more vibration
less engine life

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