Intake valves hit pistons

[RICK LAKE]

madmaxx. Hey Max give your voice a rest. You have no idea about some things. There are anti pump up lifters. If you took the time to read and talk to tech people you would know this. Poor info again. Yes some of the tech people are not the shapest in some companies, but when you are paided 10-12.00 per hour, don't expect an engineer every time. Talking to KCR, Bylins, Barry R. for info is a plus, BUT they don't make a living off FREE info. It doesn't pay the bills. Rhodes used to make bleed down lifters for high lift camshafts to raise the vacuum in a motor and Cranes sell anti pump lifters with a different bleed orfice inside. It has damn little to do with the clip that holds the lifter togeather. A machined "C" clip is better than the wire chip that are on most lifters. There is a different between normal driving and racing. Rick L.

[madmaxx]

Dont need a rest here. It is you that do not understand the physics of how a hydraulic lifter operates. The only motive force to pump up a lifter is your oil pressure, even at 60 psig (lb per square inch) oil pressure the force imposed by the oil on the lifter plunger is 40lbf (lbf). The only way a lifter can pump up is if the valve train looses control, an example would be the lifter leaves lobe due to harmonics or launches off the peak. At that point there is no spring pressure applied to the lifter and the lifter pumps up. During normal operation it is not possible for 40lbf imposed on the lifter plunger to over come 150lbf seat sprng pressure, not to mention 350lbf open spring pressures.

A way to prevent damage to your pistons due to valve float is to set the lash on the lifter at zero. This does not prevent the valve from floating but does prevent the lifter from "pumping up" since it travel is limited, hence the reason for the cir-clip instead of the wire retainer. If you are going to run against the retainer you are better off with a circlip the wire retainer which will pop out, not necessarly break.

I do not beleive you can buy a Rhoades hydraulic roller lifter.

Originally Posted by RICK LAKE

madmaxx. Hey Max give your voice a rest. You have no idea about some things. There are anti pump up lifters. If you took the time to read and talk to tech people you would know this. Poor info again. Yes some of the tech people are not the shapest in some companies, but when you are paided 10-12.00 per hour, don't expect an engineer every time. Talking to KCR, Bylins, Barry R. for info is a plus, BUT they don't make a living off FREE info. It doesn't pay the bills. Rhodes used to make bleed down lifters for high lift camshafts to raise the vacuum in a motor and Cranes sell anti pump lifters with a different bleed orfice inside. It has damn little to do with the clip that holds the lifter togeather. A machined "C" clip is better than the wire chip that are on most lifters. There is a different between normal driving and racing. Rick L.