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Valve lash on aftermarket cams

  • Thread starter Thread starter Guest
  • Start date Start date
ryder60 said:
I could use a little clarification. Stock calls for .03 inch to .08 inch. A couple of you guys are setting at .004 thru .006. To me .03 is 3 one hundredths 100 of an inch and .006 is 6 one thousands of an inch. It strikes me there is a big difference here. Am I correct, I am not sure what gap to set now.
Click to expand...

.03 to .08 millimeters, not inches. .004 to .006 inches converts to approx. .10 - .15 millimeters.
 
Andrews cam spec sheet says you can run as much as .424" lift with the factory tappet cups, with shim on top. I dont think this is wise. Rule of thumb, in my opinion, is anything over .400" lift requires shim under buckets. This is the same point at which you may have to cut relief notches in the tappet bores. So basically, if the cam lobe does not contact the top of the bore when turned, the stock tappet cups will be fine. This is assuming you use good valve springs and dont over-rev the motor. Of course we are talking about cams that were ground using the stock "base circle".....Higher lift race cams, like Web-Cams 480/460 or 500/470 combos are ground at a reduced base circle to eliminate clearance problems.......Billy
 
resurrecting another old thread...

resurrecting another old thread...

One of my 1100E's has Cam Motion G3 cams in it. The "G3" is a moderate cam with .345" lift and is ground with a smaller base circle than the stock cams. With the smaller base circle the rocker arms are closer to the centerline of the cams and further away from the valve stems. With these particular cams, my threaded rocker arm adjusters are almost fully extended to contact the valve stems at the desired clearance. By fully extended I mean there are little to no threads extending above the locknuts. Anyone ever encounter something like this? Is it a reason for concern? Is there a remedy?
 
OldSkool said:
One of my 1100E's has Cam Motion G3 cams in it. The "G3" is a moderate cam with .345" lift and is ground with a smaller base circle than the stock cams. With the smaller base circle the rocker arms are closer to the centerline of the cams and further away from the valve stems. With these particular cams, my threaded rocker arm adjusters are almost fully extended to contact the valve stems at the desired clearance. By fully extended I mean there are little to no threads extending above the locknuts. Anyone ever encounter something like this? Is it a reason for concern? Is there a remedy?
Click to expand...

adjusters.jpg

ADJUSTER SCREWS
Some very high lift cams have reduced base circles to keep the nose of the cam on the rocker pad. This can cause a problem with the valve adjuster screws being too short to get proper valve lash. Theser high performance screws are longer than Suzuki screws and solve the problem.
ERA1100S Complete set $62.95

From The GS Zone at APE! Ray.
 
Looks like just what I need. Thanks Ray!


rapidray said:
adjusters.jpg

ADJUSTER SCREWS
Some very high lift cams have reduced base circles to keep the nose of the cam on the rocker pad. This can cause a problem with the valve adjuster screws being too short to get proper valve lash. Theser high performance screws are longer than Suzuki screws and solve the problem.
ERA1100S Complete set $62.95

From The GS Zone at APE! Ray.
Click to expand...
 
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