🔍 Key Concepts

• Function of cylinder relief valves on large, low-speed diesel engines • Conditions inside the cylinder that create abnormally high peak pressure • How fuel quantity, timing, and injection nozzle condition affect maximum cylinder pressure

💭 Think About

• Think about which condition would most likely create a dangerously high pressure spike in the cylinder during combustion. • For each option, ask: does this make peak cylinder pressure higher, lower, or more uneven? • Consider what problem cylinder relief valves are designed to protect the piston, liner, and cylinder head from.

✅ Before You Answer

• Identify which option directly leads to excessive or abnormal combustion pressure, not just poor combustion quality. • Distinguish between conditions that cause misfiring or low power versus those that cause over‑pressure. • Confirm how a plugged or partially plugged injector affects the way fuel burns in the cylinder and whether that increases or decreases peak pressure.