If fuel injection in a diesel engine begins...

If fuel injection in a diesel engine begins...

Question 1 of 270705eccefa1bacbc34ba4d47418

If fuel injection in a diesel engine begins earlier than the design start of injection, ignition may be delayed because the __________.

Question 1 of 27070

Q

If fuel injection in a diesel engine begins earlier than the design start of injection, ignition may be delayed because the __________.

🔍 Key Concepts

• diesel combustion process and the role of compression temperature and pressure • relationship between start of injection timing and conditions in the cylinder • what causes ignition delay in diesel fuel (what is missing or not yet sufficient?)

💭 Think About

• Think about what conditions must be present in the cylinder at the designed start of injection for fuel to ignite reliably in a diesel engine. • If injection happens earlier than designed, which of those conditions might not yet have reached a sufficient level? • Which choice describes a condition that would still be building up as the piston moves toward top dead center in the compression stroke?

✅ Before You Answer

• Identify which option refers to a parameter that increases during compression and is critical for auto‑ignition of diesel fuel. • Eliminate any options that describe conditions that would help ignition rather than delay it. • Ask yourself: at an earlier crank angle in the compression stroke, which of these would not yet be high enough to cause the fuel to ignite promptly?