Hyd roller lifters in oil for 2 years - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-12-2013, 02:53 AM
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Thanks again for the information! The cam is a Comp XE300hr, so its fairly large. It definatly seemed more responsive, and it also sounded a little different... sounded like it had a little bit smaller cam, which is opposite of what I would have thought, but I dont care what it sounds like, as long as it runs and stays together.lol

Im glad to know that the idle speed went down for a "good" reason.

First bracket race is this weekend, with $2,000 up for grabs for the winner, in no box/foot brake class. Im hoping for a good day! Its been running consistant, but it may speed up, now that I have more duration and lift...? Ill get two time trials before first round, so I can see what its going to do.

chevyguy13

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Old 03-12-2013, 05:19 PM
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I just ignore the valve opening on a pumped up lifters. Adjust by putting the lifter on the lobe heel and zero lash it -- give it the preload and that's it. It will self adjust with the engine running. Also I don't by into the-- just give it--1/4 or 1/2 turn thing. Find out what the manufacturers required preload range is for that particular lifter and see how many turns it takes to get to the preload you want in the range. It may be 1/4, 1/2, 5/8 or 3/4 or whatever. Rocker ratio and stud thread type/count will dictate. If you really want to experiment and know your stuff you can go .010 from the bottom or say .003 from the top. But that is another topic for experienced guys.
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Old 03-13-2013, 08:57 AM
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I quit fiddling with lifter "pre-load" worries when using hydraulic lifter camshafts in 1973, after I started using Melling JB-951R limited travel hydraulic lifters in Pontiac/Olds engines. . Now I use Comp Cams short travel hydraulic roller lifters for Chevy engines.. I set them like solids on the heel of the cam lobes with a feeler gauge, .005" lash or without a feeler gauge in the pits using 1/8 turn, which is just a flick of the wrist.

They are legal to use in classes that require hydraulic camshafts with a minimum vacuum limit. That is why they are called "cheater lifters". You must cheat to win.
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Old 03-16-2013, 12:15 PM
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Not sure if any one mentioned this but if they were in oil for two years all the air space is removed so when you installed them they were solid and filled with fluid this is not the way to install hyd lifters they should be bleed down before install. If they are fully extended when installed you will never get the lash right.

When you get them they are empty and should be installed this way as per the manufactures instructions.

Also oil and other additives in the oil can hold water. was this clean oil or oil from an oil change. Either way they need to be checked for bleed down and corrosion.

If there is a question i would replace them. Atleast bleed them down and reinstall the push rods and adjust the valves again.
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Old 03-16-2013, 01:32 PM
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You can still get the lash right--the valve will open on the pre Load that's all. It will self adjust when it runs. Agreed that you should not fill them or pump them up in an oil bath. If and I mean if you are careful protect them- put them in a vise and push some of the oil out with a wood dowel. I did this after I cleaned mine in in mineral spirits. As a matter of fact new Hydraulic lifters have a coating of termalene grease on them and sometimes inside- thus the reason for the mineral spirits bath. Get the plunger to move with some light oil after cleaning them.
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Old 03-16-2013, 06:23 PM
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That was my thought with the dial indicator test I mentioned previously, non intrusive in the sense of tearing into the engine other then popping the valve covers off and observing the leak down movement of each lifter when the cam is turned to bring the lifter up onto the lobe using the valve spring as the force. If you never saw any leak down with a lifter under that test, then you would know something was amiss inside a lifter. My guess is from your readjusting and it running fine is that they are ok but worry more about the rocker arms having been backed off for that period of experimental time in running that way and damaging the cam or lifter bottom surface.
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