rocker geometry help
05-10-2013, 07:31 AM
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rocker geometry help Hey guys I'm running into an issue while trying to find my pushrod length. The issue I'm having is that no matter what the pushrod length this is the best I can get. In order to get better results I have to tighten the rocker down so much that it binds on the rocker stud. These are nsa crane golds 7/16 stud. And I'm using a comp cams adjustable pushrod.
Do I just need to clearance where the stud goes? These are on le2 heads
Do I just need to clearance where the stud goes? These are on le2 heads
05-10-2013, 08:21 AM
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Ya something is fundamentally wrong. I'm going to call crane and verify these are even SBC rockers. I bought them used with no packaging.
The top photo is near stock length PR and the bottom picture is what happens when I shorten the PR to pattern more correctly
The top photo is near stock length PR and the bottom picture is what happens when I shorten the PR to pattern more correctly
05-10-2013, 08:59 AM
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no but it collapses when i roll it over but a have a set of low tension springs on another cylinder for checking ptv clearance. i want to get the correct geometry before i bother checking ptv though
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05-10-2013, 09:03 AM
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Use the cylinder with the light springs to check geometry. If you check geometry while the lifter is collapsing the geometry will never be correct.
05-10-2013, 09:22 AM
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just got off the phone with crane. they are sbc 1.6s but since they have the 7/16 hole they wont work with the center bolt valve covers. im going to look and see if its just a little clearing needed to make it work.
but i think im going to start back over trying to find the correct length.
but i think im going to start back over trying to find the correct length.
05-10-2013, 09:48 AM
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So after trying again getting the same results I notice something. On the right is a 3/8 stud that was on the heads when I bought them. On the left is the new 7/16 stud I bought. Looks at the difference in the radius.
Does the new stud seem overly large where it flairs to what you guys use?
Does the new stud seem overly large where it flairs to what you guys use?
05-10-2013, 10:30 AM
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My phone is going crazy....
The one in the left is the one I am using. Its a 7/16.
The one on the right was for comparison reasons. To show how large the radius shoulder is on the 7/16 stud. That's why the rocker was contacting it. I clearenced the rocker and problem solved. I measured that I need a PR length of 6.950.
Sound within reason?
The one in the left is the one I am using. Its a 7/16.
The one on the right was for comparison reasons. To show how large the radius shoulder is on the 7/16 stud. That's why the rocker was contacting it. I clearenced the rocker and problem solved. I measured that I need a PR length of 6.950.
Sound within reason?