Terminology in SI engines: identify whether “detonation” is also called knocking or pinking. Statement to evaluate: “The detonation phenomenon is also referred to as engine knocking or pinking.” Choose whether the statement is correct.

Concept/ApproachIn spark-ignition (petrol) engines, detonation refers to the auto-ignition of the end-gas after normal spark-initiated flame starts. The rapid pressure waves produce the metallic pinging sound known as knock or pinking. These terms are widely treated as synonyms in SI engine context.

ClarificationPre-ignition is a distinct phenomenon (ignition before the spark due to hot spots). Detonation/knock occurs after the spark when the end-gas auto-ignites.

Final AnswerAgree.