Effect of compression ratio on knock in petrol (SI) engines: evaluate the statement. Statement: “Detonating (knocking) tendency in petrol engines increases as compression ratio increases.” Choose whether the statement is correct.

Question

Effect of compression ratio on knock in petrol (SI) engines: evaluate the statement.  Statement: “Detonating (knocking) tendency in petrol engines increases as compression ratio increases.” Choose whether the statement is correct.

Accepted Answer

Concept/Approach Higher compression ratio raises end-gas temperature and pressure, reducing the ignition delay of the end-gas and making auto-ignition (knock) more likely for a given fuel octane. Therefore, knock tendency increases with CR unless hi…

Effect of compression ratio on knock in petrol (SI) engines: evaluate the statement. Statement: “Detonating (knocking) tendency in petrol engines increases as compression ratio increases.” Choose whether the statement is correct.

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