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Old 05-16-2012, 08:38 AM
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Cam what ifu question

Just curious about what would be the result of using hyd lifters with a mechanical type camshaft? Any takers?

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Old 05-16-2012, 09:00 AM
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By the way this is a hypothetical situation no 1 that I know of has ever done this. I'm just curious as to what would actually happen.
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Old 05-16-2012, 09:14 AM
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In a small block Chev?
I have done it for oval racing engines that required the use of hyd lifters. I lash the clearance to .000-.002" cold and have had no issues.
I use the Isky racing hyd lifters only.
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Old 05-16-2012, 05:12 PM
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On some solid cams the ramp rates are higher which "could" cause some issues with a hydraulic lifter. Are you talking a roller cam or a flat tappet cam?
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Old 05-16-2012, 08:57 PM
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I was thinking of a mechanical flat tappet cam. My thoughts on this Would be that a mechanical flat tappet cam uses a valve lash setting of "x" and a hydraulic type camshaftt. Uses no lash1 at all. So by trading out lifter types, wouldn't the total valve lift increase by "x" once the hydraulic lifters "pump up" at higher rpm?
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Old 05-17-2012, 08:21 PM
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Quote:
Originally Posted by Balls
I was thinking of a mechanical flat tappet cam. My thoughts on this Would be that a mechanical flat tappet cam uses a valve lash setting of "x" and a hydraulic type camshaftt. Uses no lash1 at all. So by trading out lifter types, wouldn't the total valve lift increase by "x" once the hydraulic lifters "pump up" at higher rpm?
You don't want the hydraulic lifter to "pump up". You want it to always have a tiny amount of cushion to it. Bad things can happen when a hydraulic lifter pumps up to 100% extension.

Think about it like this...............

If it "pumps up" and gets you a tiny bit of extra lift, then it won't bleed down on the down ramp. When this happens the valve will never fully seat like it's supposed to. You will lose a ton of power and the car will nose dive.
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Old 05-17-2012, 10:57 PM
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So then how would you want to adjust the valves? Sounds like joelster has the situation figured out since he has actually done this successfuly.. so... to make sure I understand this correctly, a person would not want to adjust the valves in the traditional way by backing off the lock nut until it starts to clatter then tightening it down till it stops and giving it an additional half turn. Instead you would do as joelster explained to insure that the lifter maintains a safe amount of cushion. Is that correct?
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