Hydraulic Roller Lifters
Hydraulic roller lifters are new
alternatives to the traditional mechanical lifter, and are considered by some
car experts to produce less car noise and less chance of problems.
When you operate a hydraulic lifter, the
engine pushes down on the camshaft. The camshaft in turn exerts pressure on the
lifter, and particularly a small plunger attached to a metal spring. At the
same time, oil travels to the lifter, and pressure within it causes the plunger
to move upward.