Editing Lifters (section)
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===Hydraulic lifter=== The hydraulic lifter has been a mainstay for over 40 years in domestic automobile engines. Its design allowed a basically maintenance free valve train. They are usually quiet and reliable. The hydraulic lifter was invented as a means of reducing maintenance and quieting the valve train. Generally the pressure from the engines oil pump would provide the "self adjusting" hydraulic action and keep the lifter tight to the camshaft and push-rod. This action was well controlled by design within the normal operating ranges of most passenger vehicles although over-extension, known as lifter "pump up" of the lifter can occur at elevated RPM, allowing the valves to be held off the seat causing a loss of power. This means mechanical lifters are the preferred type of lifter for high RPM applications. Later versions of performance hydraulic lifters included anti-pump up-types and roller lifter types as well. *[http://www.youtube.com/watch?v=lorANZ1Tptw '''Click here'''] for a video that shows an animation of a hydraulic lifter. <br> [[File:Lifter cutaway preload.jpg|border|400px|right]] [[File:Pontiac service manual lifter diagram.jpg]] ====Fast bleed down hydraulic lifter==== An example of a fast bleed down hydraulic lifter is the [http://www.rhoadslifters.com/ Rhodes] lifter. The Rhodes lifter accomplishes the fast bleed down by machining a precision groove on the plunger, possibly by using EDM (electron discharge machining) or laser. This groove allows the oil to bleed out of the lifter at a faster- yet controlled- rate. This allows the lifter to lower the lift and duration of the cam at lower RPM, typically from idle to ~3000 RPM or so, depending on the valve spring pressure and oil viscosity. At higher RPM, the lifter behaves as a normal lifter would. <br style="clear:both"/> Below, the groove on the plunger can be seen at the arrows. The plunger is partially removed from the lifter body; the retainer clip and pushrod cup having been previously removed. [[File:Rhodes lifter groove.jpg]]
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