Detonation in the S.I. engine becomes severe during
Detonation in the S.I. engine becomes severe during Correct Answer High load and low speed
Concept:
For higher engine loads, the tendency of knocking will increase in SI engines. When load increases, more fuels will be admitted in combustion chamber of SI engines raising the compression, thus resulting in higher pressure & temperature of the end charge. This leads to auto-ignition of the end charges before the flame reaches there.
For increasing engine speed (if load remains same), there will be less detonation in an SI engine. Since the flame front speed will increase at higher turbulence.
Low engine speeds will give low turbulence and low flame velocities and knock may occur at low speed.
Hence the detonation in S.I engines becomes severe during low speed and high load
