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(a) “Knocking in SI Engines is due to autoignition of the “end charge” while knocking in CI Engines is due to autoignition of the “first charge”

Discuss this statement and tabulate the effect of engine operating and design parameters on the knock intensity in SI and CI engines, giving reasons for the effects indicated by you.                                                                                      

 

(b) What do you understand by the term ‘dopes’ used in IC Engine practice? Name at least two organic and two metallic dopes per litre of gasoline completely suppresses knocking in SI engines. What additives are used to increase the cetane rating of diesel oil?

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