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Old 04-12-2012, 11:17 PM
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Hydraulic Lifter question

G'Day
I have a situation where I am installing a good condition used (approx 2000 miles) hydraulic cam and lifters (flat tappet) in a 350 chev. I have only experience with solid lifters and not hydraulics.
The cam followers have been kept in order (obviously ) and upon inspection I have noticed that most of them will allow the piston in the lifter body to collapse nicely under light pressure, but 4 or 5 of them are as hard as a rock. I'm guessing that some are full of oil and others aren't. I soaked them in oil overnight but it made little difference.
My question is should I just install them all in this state? Is this normal, or is there some preperation that should be done prior to dropping them into their respective bores?
If anyone could enlighten me it would be greatly appreciated.
One guy said to leave them out in the sun on a hot day and let all the oil drain out of them...but I just don't know?
the camshaft is a comp cams 292H if that is relevant..

Duke

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Old 04-12-2012, 11:40 PM
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Hi Duke,

I had a used lifter once that was so pumped up I nearly broke a vise squeezing it down.

Besides ya know you should not be playing with some ones old cam shaft mate. Ask yourself,,,do you know were its been?

The sun will not help you other than to brighten your day.
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Old 04-13-2012, 01:19 AM
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Hi Custom
Actually I do know where this ones been and it's ok. But I do understand where your coming from.
If you know much about particular cams you might be able to help me out?
This cam 292H has lobe lift of .334" and valve lift of .501" with 1.5:1 rocker.
I have set piston to valve clearance to .100" by way of fly cutting flat top pistons and the engine is assembled.
If I decide to go with a new cam, I would opt for the equivalent grind being the 294S which has lobe lift of .350" and valve lift of .525" but using a lash of .022"
Does this mean that the gross valve lift would be the same as the 292H?
Taking into account the .022" lash?
Do you think that my P/V clearance would still be sufficient using this solid cam in place of the 292 hydraulic grind?

Anyone else knowledgeable ? Please chime in!!

Duke
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Old 04-13-2012, 03:08 AM
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Quote:
Originally Posted by thinwhiteduke
Hi Custom
Actually I do know where this ones been and it's ok. But I do understand where your coming from.
If you know much about particular cams you might be able to help me out?
This cam 292H has lobe lift of .334" and valve lift of .501" with 1.5:1 rocker.
I have set piston to valve clearance to .100" by way of fly cutting flat top pistons and the engine is assembled.
If I decide to go with a new cam, I would opt for the equivalent grind being the 294S which has lobe lift of .350" and valve lift of .525" but using a lash of .022"
Does this mean that the gross valve lift would be the same as the 292H?
Taking into account the .022" lash?
Do you think that my P/V clearance would still be sufficient using this solid cam in place of the 292 hydraulic grind?

Anyone else knowledgeable ? Please chime in!!

Duke
Well I have never thought of it that way before. The lash is there to allow the metal to expand during heating. So when its cold you would have less lift, and when it gets hotter you would get more lift (your .022" lash would tighten up). How much does it tighten? I don't know. But your PV clearance would be reduced some.



BTW I asked the same question about "frozen" lifters and here is the answer I got. It seems as if they are OK to re-use. As for me, I ended up with a new cam and lifter set, so I never reused them.
How do I tell if these hydraulic lifters are bad?
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