🔍 Key Concepts

• cam profile and geometry in a valve train • relationship between cam slope/steepness and valve motion • difference between how fast a valve moves vs. overall engine performance characteristics

💭 Think About

• Ask yourself: What does changing the steepness of the cam lobe ramp directly change in the valve’s motion? • Which option talks about something that happens immediately at the valve rather than a broader engine characteristic? • Does the cam slope angle directly set valve size, or does it control how the existing valve moves over time?

✅ Before You Answer

• Focus on what the cam lobe shape physically controls in the valve gear mechanism. • Separate direct mechanical effects (valve motion vs. time) from indirect engine outcomes (torque, efficiency). • Verify which choice describes a rate of change of valve lift over time, not an overall engine property.