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.