with valve bounce on closing, or as the dynamic spring load on the valvetrain is drastically diminished while the cam's lobe rotates over the nose at high rpm. The hydraulic lifter's plunger will ...

Solid flat tappet, hydraulic flat tappet ... See All 18 Photos 1.In this diagram from COMP Cams it’s easy to see the relationship between the lifter and the cam lobe. With a roller tappet ...

Likewise, although hydraulic ... valve motion. While the common misconception that the OEMs went to roller lifters to reduce friction, the real reason they switched was to reduce lifter failures ...

The hydraulic roller lifters used by the fifth-gen 6.7 eliminated the need to adjust valve lash and reduced the engine noise level, but introduced a new failure point. Lifter failure in 2019 and ...