Question

What results in the use of a high degree of overlap inat lower engine speed?

(a) Loss of torque

(b) Gain of performance

(c) loss of torque and performance

(d) Gain of torque and performance

I have been asked this question during an interview for a job.

The doubt is from Variable Valve Timing topic in chapter Valve Timing Technologies of Automotive Engine Design

Answer 1

Right answer is (c) loss of torque and performance

The best I can explain: The use of a high degree of valve overlap results in a loss of torque and performance at lower engine speeds. Moreover, the engine idling is also unstable-the engine hunts and misses, on stall.