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Solid roller lifter on a hydraulic roller cam

Old 05-03-2007, 10:35 PM
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Default Solid roller lifter on a hydraulic roller cam

Need input here. I'm running a Lunati 612/612 Lift with a 245 / 250 duration @ 50. 112 Deg centerline. I'm getting breakdown in my lifters for all intents, I've got a valve tick even after adjustment. I think I'm at the limit as far as a cam goes while still using hydraulic roller lifters? Is that right? Anyway, I'd like to use solid rollers on this cam. I don't see why I cant, do you guys? And what do you think of this cam for a blower application? I'm pushin' 8-10 pds. with World Casting oval port heads. Thanks for any input.
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Old 05-03-2007, 10:51 PM
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I've heard of this before by reputable builders. I am pretty sure you can use solid lifters on a hydraulic cam, but not hydraulic rollers on solid cam.

I believe it is all about the ramp profile of the cam. Aggressive requires solids.
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Old 05-04-2007, 03:37 AM
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There are plenty of cams the same size or larger than yours that run hydraulic roller lifters.

The rpm you are spinning is more of a factor. What rpms?????
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Old 05-04-2007, 05:40 AM
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Which lifters are you using that are giving you the tick?
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Old 05-04-2007, 07:25 AM
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When I bought my boat the motors were set up this way. The valve springs lasted about 50 hours. I wouldn't do it.

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Old 05-04-2007, 11:01 AM
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Spring pressures are good, springs are Manleys and are not breaking down at high rpm. I run to 6500 or so.
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Old 05-04-2007, 11:45 AM
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6500 is too much for hyd lifters. Have you tried a bigger prop to get the rpms down. Is it dynoed????
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Old 05-05-2007, 03:09 AM
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I am having the same problemswith a 600 lift HYD roller cam. Breaking springs and ticking. Generally noisy valve train. I will be going to solid soon as well. By builder says you cant put solid rollers on a HYD cam. There is something about the inital ramp thats different because of the lash. Im not sure but better check it out well. Jas
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Old 05-05-2007, 07:54 AM
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I agree, 6500 isnt much really for a Hyd lifter. What brand are you running? I'm going to go out on a limb and guess a Comp Cams Type R lifter.

If you havent already, check into the Morel lifters. These things are incredible. I have seen them take 8000 RPM without issue repeatedly.
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Old 05-05-2007, 08:24 AM
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i have had good luck with isky also, one of the few things that has not failed....All subjct to change the new mill is going for some testing and tuning today
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