Technician A says that some multivalve heads use control valves that cause only one intake valve to open at low rpm and another to open at higher rpm. Technician B says that other multivalve heads use two intake manifold runners per cylinder. Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question

Quizplus · Accepted Answer

Both technicians are correct. Some multivalve heads use variable valve timing technology which allows for different intake valves to open and close at different times depending on engine speed. Other multivalve heads use a dual-intake manifold system where there are two intake runners per cylinder, one for low-end torque and one for high-end power.

Technician a Says That Some Multivalve Heads Use Control Valves