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  1. #1

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    RXP Valve train Help

    Is there a chance that when we're riding in the chop the oil is foaming or losing oil pressure causing the hydraulic lifters to go soft then slam the valve causing valve float?
    Is this why we are dropping valves in the chop???
    Or is it from too much overrev???


  2. #2
    Got Boost? psycho rxp's Avatar
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    I'm pretty sure it's from over-revving when unhooking in the chop. Stan Did it happen again?? U have the RR oil pressure jet, and the lifters should be fine in any riding conditions, unless it ran out of oil . I saw 9000+ unhooking once long ago. Now I just pump the throttle more in the slop.

  3. #3
    Site Admin Green Hulk's Avatar
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    Stan, if you have the RR oil pressure jet then i would say your problem is due to over rev.

  4. #4

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    Will solid lifters fix it?

  5. #5
    Site Admin Green Hulk's Avatar
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    Putting solid lifters into this valvetrain would be tricky. A properly setup valvetrain would solve your issue. (the right combo of springs, valves and retainers)

  6. #6
    GTXX's Avatar
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    As you know there isn't any way to adjust solid lifters built into the valve train now so that could be a very expensive proposition. Two things can happen to cause what is called floating the valves, one is false motion where the valve is moving so fast at high rpm that it opens farther than the rocker arm is pushing it and snaps shut because it is no longer following the cam profile. This is what the stronger valve springs is supposed to fix and may be what is snaping your valve stems. The other happens with hydraulic lifters only, the lifter is designed to continuously bleed off a certain amount of oil and at high rpm it may not bleed off enough oil and pump up not allowing the valve to close completely, like too tight of a valve lash setting on solid lifters. The way this was corrected on some engines with non-adjustable shaft mounted rocker arms was to put a .015" thick shim under the rocker shaft. This in effect made a looser lash setting which increased lower rpm power a little and allowed the engine to run high rpm without pumping up the lifters. When the lifters get pumped up like this, they don't allow the valves to close completely and the valves can get hotter than normal. If a head has been cut and that thickness was not added back with a thicker head gasket it would tend to contribute to the lifters pumping up too. You may know all this stuff, but if not maybe it's a little food for thought.

  7. #7
    remember the o6's dont have the oil presure jet. allowing more oil to go thru the rockers

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