Rocker geometry at full lift?
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Rocker geometry at full lift?

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    Senior Member jrider44's Avatar
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    Default Rocker geometry at full lift?

    Is the positon of the roller tip to the valve okay in this photo? My cam is at full lift in this photo.
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    1978 Hawaiian Party Cruiser
    Stevens V-drive(sold to bbollig55)
    Spico V-drive

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    gn7
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    No. Based on the pic I would say your PR is short.
    BTW, is this a new cam?



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    Senior Member MACHINEHEAD1's Avatar
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    Looks like the hyd. lifter has depressed. Look at the spring, its got a long way to go. OP, are you sure you have .500,.600 (whatever) lift at the valve here? If this is correct (.600?), I would think at mid lift, the roller would be off the stem.

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    gn7
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    Quote Originally Posted by MACHINEHEAD1 View Post
    Looks like the hyd. lifter has depressed. Look at the spring, its got a long way to go. OP, are you sure you have .500,.600 (whatever) lift at the valve here? If this is correct (.600?), I would think at mid lift, the roller would be off the stem.
    No doubt that thing is a long ways from max lift. Like you said, either a hyd, or on very flat solid.
    Also, he needs to seriously consider new springs. Rusted springs don't tend to live long.



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    Senior Member jrider44's Avatar
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    Quote Originally Posted by MACHINEHEAD1 View Post
    Looks like the hyd. lifter has depressed. Look at the spring, its got a long way to go. OP, are you sure you have .500,.600 (whatever) lift at the valve here? If this is correct (.600?), I would think at mid lift, the roller would be off the stem.
    Quote Originally Posted by gn7 View Post
    No doubt that thing is a long ways from max lift. Like you said, either a hyd, or on very flat solid.
    Also, he needs to seriously consider new springs. Rusted springs don't tend to live long.
    I'll double check to make sure I'm getting max lift, see if I can find a solid lifter to use. If the roller doesn't travel any farther to side of stem, would it be acceptable to run it this way? I noticed how the springs looked after I posted the picture. They are okay, just took them out of the parts washer yesterday, assembled the heads and the humidity got to them before I got any oil on them. Thanks for the replies...keep em coming
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    go to the "tech links" section at the top of the dyno section main page and open it. page down about 5 or 6 posts, and there's a link to everything you could ever possibly dream to know about rocker geometry...

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    Senior Member jrider44's Avatar
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    Quote Originally Posted by bp298 View Post
    go to the "tech links" section at the top of the dyno section main page and open it. page down about 5 or 6 posts, and there's a link to everything you could ever possibly dream to know about rocker geometry...
    Thanks. I forgot about that...I think I may have even read it before
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    steelcomp was here
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    Quote Originally Posted by bp298 View Post
    go to the "tech links" section at the top of the dyno section main page and open it. page down about 5 or 6 posts, and there's a link to everything you could ever possibly dream to know about rocker geometry...
    LOL...
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    gn7
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    Quote Originally Posted by bp298 View Post
    go to the "tech links" section at the top of the dyno section main page and open it. page down about 5 or 6 posts, and there's a link to everything you could ever possibly dream to know about rocker geometry...
    Quote Originally Posted by steelcomp View Post
    LOL...
    What are you laughing about. It's your thread.
    Did you hold something back?



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    gn7
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    Quote Originally Posted by jrider44 View Post
    I'll double check to make sure I'm getting max lift, see if I can find a solid lifter to use. If the roller doesn't travel any farther to side of stem, would it be acceptable to run it this way? I noticed how the springs looked after I posted the picture. They are okay, just took them out of the parts washer yesterday, assembled the heads and the humidity got to them before I got any oil on them. Thanks for the replies...keep em coming
    If you're running a hyd roller, you can't just substitute a solid lifter. The rushrod will be different lengths for the hyd and solid lifters. That only works with flat tappets



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    Quote Originally Posted by gn7 View Post
    If you're running a hyd roller, you can't just substitute a solid lifter. The rushrod will be different lengths for the hyd and solid lifters. That only works with flat tappets
    So what do you use then? does this hold true for degreeing also?
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    Quote Originally Posted by gn7 View Post
    What are you laughing about. It's your thread.
    Did you hold something back?
    Naw, just chuckling at bp's comment.
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    Quote Originally Posted by limited View Post
    So what do you use then? does this hold true for degreeing also?
    You can use a solid roller lifter if you have a way of measuring the difference between the solid and the hyd lifters. You need to use a 5/16 ball in the socket of the lifters and measure the difference to the center of the roller axle. Usually around .800", but it will vary. Make sure they both have the same diameter roller.
    Last edited by scott foxwell; 06-09-2013 at 07:19 PM.
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    gn7
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    Quote Originally Posted by steelcomp View Post
    You can use a solid roller lifter if you have a way of measuring the difference between the solid and the hyd lifters. You need to use a 5/16 ball in the socket of the lifters and measure the difference to the center of the roller axle. Usually around .800", but it will vary. Make sure they both have the same diameter roller.
    Steel, I have never degreed or set geometry with a hyd roller. How much will the plunger move using a light spring in place of a valve spring? Does the plunger still move, (dare I say it) a significant amount?



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