Question

Which system can change independently the valve-event timing and valve lift?

(a) Profile switching system

(b) Phase changing system

(c) Variable event-timing system

(d) Variable lift system

I got this question during an interview.

I would like to ask this question from Variable Valve Timing in chapter Valve Timing Technologies of Automotive Engine Design

Answer 1

Right choice is (a) Profile switching system

The best explanation: The profile switching system can change independently of the valve-event timing and valve lift. Variable event-timing system can change both the phase and duration of the valve event.