Engineering · Diesel — Combustion
Diesel knock is caused by:
- AFuel igniting too early during compression
- BAn excessively long ignition delay so accumulated fuel burns abruptly✓ Correct
- CWater in the lube oil
- DLow jacket-water temperature only
Explanation
A long ignition delay lets injected fuel accumulate; when it finally ignites the rapid pressure rise produces the characteristic knock. Higher cetane fuel shortens delay.
Authority: Diesel Engines (USCG engineering topic)
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