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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 07-12-2013, 12:02 PM   #1
Mikester
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Quote:
Originally Posted by TheRealSy90 View Post
1: It's not a Chevy.
2: They are not flat tappet lifters.
3: It's not a Chevy.
He was illustrating a point. Although there are distinct differences, the principle is the same. At high rpm, SR20 hydraulic lifters can have trouble keeping pace with the rocker arms; resulting in rocker float & potential havoc being wreaked underneath the valve cover. Hence the invention of rocker arm stoppers and/or the choice of some of us to use solid lifters. If the lifter is always in a fixed position, and the valves are properly shimmed; chances of rocker float at higher rpms are decreased significantly (at least that's the theory lol). Now- With the lifters being stationary and the valves being shimmed accordingly; the cam profile (lobe shape & rocker ratio) of a regular hydraulic cam is no longer compatible and will kill valves/stems/seals (maybe even the cams & journals???) very quickly. The inverse is also true with respect to hydraulic lifters & solid-type cams... Knowing that the cam profiles and lifter types need to be compatible, one can only be used with the other.

The big picture to this thread is that OP unfortunately made a few bad choices and is now trying to pick up the pieces and make more informed decisions about where to go from here. No need to split hairs.
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