On many variable displacement engines, the cylinder deactivation is done by use of a(an) ________.
A) Cam shifting
B) Two stage hydraulic lifter
C) Spark retard
D) None of these

Question

Quizplus · Accepted Answer

On many variable displacement engines, the cylinder deactivation is done by use of a two-stage hydraulic lifter, which can "collapse" to disable a cylinder's intake and exhaust valves. This allows the engine to operate as a smaller displacement engine with fewer cylinders, reducing fuel consumption during light load conditions. Cam shifting and spark retard are not commonly used for cylinder deactivation.

On Many Variable Displacement Engines, the Cylinder Deactivation Is Done