ITT: Shim Under Buckets; When and Why?
#21
I used some go no-go feelers on my test-assembled head. Cleaned bucket/shim interface real good with brakleen. Lobe positioned 180* from shim surface for measuring. Hope I did it right.
Sooo at any rate, as I'd like to keep this thread about SUBs as possible : Are there reduced wear characteristics of running SUBs? Decreased chances of valve float would help keep valves happy. Which is the wear item in the BP valvetrain, Cam or lifter?
Sooo at any rate, as I'd like to keep this thread about SUBs as possible : Are there reduced wear characteristics of running SUBs? Decreased chances of valve float would help keep valves happy. Which is the wear item in the BP valvetrain, Cam or lifter?
Less weight, thus: less HP to drive cams, less wear on cams, for the same spring stiffness, better valve control as less weight to accelerate. Can now rev higher since valvetrain has better control.
Downside is cost and time to do it.
FWIW, I run the double heavy springs, and have revved to 8,800 and not spit a shim. So if you're goal is only 7,400, I wouldn't say you "need" them, but less valvetrain weight is ALWAYS nice so if you want it, do it, but I'd run the heavy double springs before converting myself.
#26
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@guttedmiata: Great point about feeler measurement. Certainly something to consider. I bought an extra shim on the thick side in case.
Good info guys. I've been convinced on it's merits. With new cams I will surely end up running SUBs or Zetec depending on base circle diam. of new cams.
Good info guys. I've been convinced on it's merits. With new cams I will surely end up running SUBs or Zetec depending on base circle diam. of new cams.
#28
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Ok so I have a valve grinding machine I built, I can tip valves, removing 1/2 a thousandth with decent accuracy. I have aftermarket supertech valves. Can I do this? Is it basically just keep tipping the valve till it's short enough to use these lifters? And are you serious about the 3/4 lb part?!
Can I see pics of the machine you made? I'd love to be able to grind my own tips. Is there a temperature to keep them under, is there a hardened layer that only allows so much material cut ?
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