Which outcome occurs when exhaust valve timing is excessively retarded in a diesel engine?

💡 Explanation

When exhaust valve timing is retarded excessively, incomplete combustion occurs since less exhaust gas is expelled during the exhaust cycle decreasing the amount of fresh air which degrades scavenging, reducing effective compression ratio and thus thermal efficiency. Therefore reduced efficiency results, rather than lubrication failure, pressure increase, or after-treatment issues, which derive from drastically different processes.

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