The Valve Lifters …...

Who cares about “Valve Lifters”? Answer we do!

1. What is a valve lifter?

2. When it was created?

3. Why is it use?

4. Are there any problems?

5. The future!

Things we will cover about Lifters!

imparts a linear motion to some other component within an assembly.

Body of tappet made light metal Ex: Al Wear resistant contact surface w/ cam

A Valve Lifter

Purpose cylinder and resistant top Nobuo Hara Fuji Oozx inc. Maybe Ritter, Clyde G Japan

Nobuo Hara is the daddy of lifter!

valve follower Help open valves 3 main types of valve lifters

Valve Lifters are used to

Has to be adjusted frequently Aka solid lifter noisy valve lash Higher spring pressure Maybe higher rpm

1.Mechanical lifter

Doesn’t need adjusting often Very quiet Oil Lower rpm maybe Use in most new cars

2.Hydraulic lifter

Mechanical or hydraulic lifter Out performs flat Has a wheel that spins Reduces friction Higher rpm Reusable Higher spring loads Less wear Consistent today’s oil

3.Roller type Valve lifter/tappet

Hydraulic A. valvetrain will rattle loudly on startup

B.pump up

Mechanical A. Needs adjusting too much

Roller A. Play

Problems with lifters

tappets may stop entirely as engines move to variable valve timing systems.

The Future

The end.