Question

Two technicians are discussing variable valve timing. Technician A says that changing the exhaust valve timing helps reduce exhaust emissions. Technician B says that changing the intake valve timing helps increase low speed torque. Who is correct?

Answer 1

c. Both Technicians A and B

Step-by-step explanation:

In internal combustion engines, variable valve timing is the method or practice of changing the timing of a valve lift event, which is most of the time used for performance improvement as well as fuel economy or emissions. It is gradually being used in combination with variable valve lift systems.

It is known that changing the exhaust valve timing helps reduce exhaust emissions and also changing the intake valve timing helps increase low speed torque.

So both Technicians are correct.