Another Roller Cam Question
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Another Roller Cam Question

  1. #1
    Senior Member Ahsumtoy's Avatar
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    Default Another Roller Cam Question

    Are the cams, solid & hydraulic, the same? In other words, if I have a hydraulic roller cam can I just change to solid roller lifters and use the same cam?

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  3. #2
    gn7
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    Quote Originally Posted by Ahsumtoy View Post
    Are the cams, solid & hydraulic, the same? In other words, if I have a hydraulic roller cam can I just change to solid roller lifters and use the same cam?
    They are not the same. Solid cams have awhat is called clearance ramps that take up the lash before the lifter gets on the cam's flank. The clearance ramps are what determines you lash.
    Hydraulic cams have virtually no clearance ramps, or very short


    BUT if what you asking is can you run solid lifters on a hyd cam, the answer is yes. Many newer solid cams are what is called tight lash. These tend to have clearance ramps similar to Hyd cams. So in essence, running a solid on a hyd cam is the same idea as running a tight lash solid.

    There is more to it than this simple explaination. You may what to get ahold of Cstraub. He has set up a couple of members with hyd cams and solid lifters.
    I believe Brain at B&D Marine has built a couple as well.



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  4. #3
    steelcomp was here
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    Quote Originally Posted by gn7 View Post
    They are not the same. Solid cams have awhat is called clearance ramps that take up the lash before the lifter gets on the cam's flank. The clearance ramps are what determines you lash.
    Hydraulic cams have virtually no clearance ramps, or very short


    BUT if what you asking is can you run solid lifters on a hyd cam, the answer is yes. Many newer solid cams are what is called tight lash. These tend to have clearance ramps similar to Hyd cams. So in essence, running a solid on a hyd cam is the same idea as running a tight lash solid.
    There is more to it than this simple explaination. You may what to get ahold of Cstraub. He has set up a couple of members with hyd cams and solid lifters.
    I believe Brain at B&D Marine has built a couple as well.
    Not quite. If you run a solid lifter on a hyd. cam you have to lash it, so you will lose some of the area of the lobe and won't get everything out of the cam. A clearance ramp designed for .010-012 lash is still a lot different that one designed with zero.

    Solid lobe profiles are usually a little more -to a lot more- agressive than hyd. and may not be suitable for a hyd lifter, no matter how good the lifter is...at least not untill Morel comes out with thier .903 hyd. roller lifter.
    Last edited by scott foxwell; 04-26-2012 at 08:37 AM.
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  6. #4
    gn7
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    Quote Originally Posted by steelcomp View Post
    Not quite. If you run a solid lifter on a hyd. cam you have to lash it, so you will lose some of the area of the lobe and won't get everything out of the cam. A clearance ramp designed for .010-012 lash is still a lot different that one designed with zero.

    Solid lobe profiles are usually a little more -to a lot more- agressive than hyd. and may not be suitable for a hyd lifter, no matter how good the lifter is...at least not untill Morel comes out with thier .903 hyd. roller lifter.
    Geez Scott, it was simplification. Yes, of course solids on a hyd cam do have to have a lash, and usually much tighter than a tight lash solid cam. And there was no question asked about the agressiveness of the profile. The question seemed to be, can it be done, not will the cam make the same HP as a solid. The key word is USUALLY more aggressive. I have a solid roller street cam that looks pale against some of the newer hyd rollers out there now. But at the time that I bought it hyd roller cams were non existent.



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