🔍 Key Concepts

• Diesel engine air flow and why intake air motion matters for combustion • Difference between turbulence, swirl, and squish in cylinder air movement • How intake port shape/direction can control air motion inside the cylinder

💭 Think About

• Think about what happens to the incoming air before fuel is injected in a diesel engine—what kind of motion do we want for good mixing? • Which of the listed options describes a motion of air that you would deliberately create by shaping and angling the intake port? • Look at which choices describe reducing a motion vs. creating or opposing a motion—what is the main purpose of a directional intake port design?

✅ Before You Answer

• Identify which options are about creating organized air motion versus reducing it • Recall that efficient diesel combustion depends on good mixing of fuel and air—what kind of air motion helps that? • Make sure you are focusing on the effect on incoming air, not on hot exhaust gases or valve protection