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« on: December 31, 2011, 06:33:38 AM »
DrDano DANO Here's my thoughts and small amount of knowledge on this idea,
If you want to run solid lifters fine, Adjustments should only needed to be done once a year and then just a check with good parts.
like any motor built, matching camshaft,lifters, compression, carb, valve springs, exhaust, and fuel are needed toget max power.
RPM range and limit, IMP biggest issues of all. If you are going with a street motor than will get some 5,000 rpm and above to 6,000
shifting but spend 95% of the time cruising in the idle to 3,000 rpms, there is no reason for solids. Solids also take a beating at idle of a motor.
This is where the most damage is done. We call it valve lash, I call it hammering. The oil if in the proper locate on the camshaft lobe helps cushion
the valve lash. At idle you have low pressure and less splash to help lube the valve train. On some motors we used to but .010" grroove in the bores of the lifters to have a drip of oil hit the lobe on the camshaft before the roller of the lifter hit the same mark. This did help extend the life of the solids.
I think that you also need to look at valve springs and how must pressure you really needs verses what the motor wants for a max rpm. I have been running beehive springs for 12 years. No failures of the valve springs with a .587-.607" lift hydro roller camshaft. At max lift my pressure is 362 and still will turn the motor to 6,200 max. I do get a float at 5,800 rpms but have stopped the major power drop by limiting the plunger in the lifters to be depressed only .015". When the motor is hot, I have about .003" of plunger depression, just enough to stop clicking of rocker and pushrods. The lifters pump up and the power doesn't fall off as quick. I do run HVHP oil pump with 100# spring. The high oil pressure turn the hydro lifters into almost a solid setup without going solid. If you are looking for every last HP, not TORQUE go solid and don't let the car idle. A 30-40 oil pressure with a hot motor would also be a good idea. I know some guys are idling their motor with 10 psi and thats for the bottom end, I doubt there is any pressure but a dribble going to the rocker arms. I don't know about how good it is to swap a hydro lifter on to a solid lifter camshaft. I have heard stories both ways for good and bad. Due to some of the breakin and oil problems, can't be 90% sure on this topic. Rick L. P.s good luck with setup