Cam break in dual valve springs - Reply to Topic

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Topic Review (Newest First)

  • 08-15-2010, 07:28 AM
    Hass828
    Quote Originally Posted by 1SNYDER View Post
    Maybe because they were flat top pistons ,burnt at eye brow of the valve relief,never got over 1200 egt, 30 degrees locked out and a little rich. Running AV gas with 7lbs fuel pressure.12lbs boost,JE/SRP told me that 8lbs is considered max. Burnt 6out 8 in 10 hours all in the exact same spot
    Get rid of the av gas, put some sunoco supreme112 in it, leave the timing at 30, turn the boost up to 15-17psi and those pistons will live for yrs.
  • 08-14-2010, 09:29 AM
    1SNYDER
    Maybe because they were flat top pistons ,burnt at eye brow of the valve relief,never got over 1200 egt, 30 degrees locked out and a little rich. Running AV gas with 7lbs fuel pressure.12lbs boost,JE/SRP told me that 8lbs is considered max. Burnt 6out 8 in 10 hours all in the exact same spot
  • 08-14-2010, 08:58 AM
    jetboatperformance
    Quote Originally Posted by gn7 View Post
    but the cam should have been coated with MOS2 paste. I am beginning to wonder if all these cam failure aren't partially because they no longer supply MOS2 grease with the cams.
    Bob I got some of the "stuff" in my stash , I'll send a sample to you before it becomes illegle to own moly
  • 08-14-2010, 08:32 AM
    gn7
    Quote Originally Posted by 1SNYDER View Post
    That they can't take no more than 8lbs of boost
    Running 12 lbs on a 18cc dome, with zero issues. May what to look somewhere else for you problem. Like maybe the tune up.



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  • 08-14-2010, 06:42 AM
    moppy
  • 08-14-2010, 06:39 AM
    moppy
  • 08-13-2010, 10:34 PM
    1SNYDER
    That they can't take no more than 8lbs of boost
  • 08-13-2010, 10:01 PM
    earlbrown
    Flat tappets belong in a museum not an engine.
  • 08-13-2010, 07:24 PM
    gn7
    Quote Originally Posted by 1SNYDER View Post
    Definatly remove the inner springs for break in. Just did a bbc with a Crower flat tappet cam, removed inner springs & used Comp cams additive. Turbo motor, found out the hard way about SRP pistons, Tore it down, Cam looks great,all lobes worn witin a few thouandths Good luck
    What did you learn about SRP pistons?



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  • 08-13-2010, 07:15 PM
    1SNYDER
    Definatly remove the inner springs for break in. Just did a bbc with a Crower flat tappet cam, removed inner springs & used Comp cams additive. Turbo motor, found out the hard way about SRP pistons, Tore it down, Cam looks great,all lobes worn witin a few thouandths Good luck
  • 08-13-2010, 06:48 PM
    Blowncat 509
    Quote Originally Posted by gn7 View Post
    Reguardless of what you do, over fill the oil pan by at least one quart. If you mean oil on the cam, good luck. Even if it was Comp break in oil, or break in additive. That stuff is great as an additive to the oil, but the cam should have been coated with MOS2 paste. I am beginning to wonder if all these cam failure aren't partially because they no longer supply MOS2 grease with the cams.
    X2 on all this! I was really pissed back when Crower started putting that
    thin runny red stuff that drips off the cam in the box, instead of the good
    old moly paste! good thing I had a quart can of some mil spec moly lube
    on the shelf! GM EOS used to be a good additive, don't know about it now tho' just been biting the bullet and using Brad Penn break in oil on all the
    solid cam engines lately
  • 08-13-2010, 05:23 PM
    gn7
    It doesn't take but a few pounds to hold the valve closed. Just bring the piston up to TDC, so that no matter what happens, the valve can't drop into the cylinder.



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  • 08-13-2010, 04:58 PM
    One More Year
    by oil on the cam I didn't mean the break in oil. I am not sure what it is but it is the red gooey stuff from comp all over the cam and lifters. I am probably going to attempt to pull some springs tonight if I have the right fitting for my compressor to air up the cylinders. how much pressure? should only take 20 lbs or so huh? I will keep you all posted and thanks!!!
  • 08-13-2010, 04:52 PM
    HammerDown
    Increase you odds GREATLY of a good break-in >>> REMOVE THE INNER SPRINGS!
    Heck I ran my old engine on the river for a hour or so without the inners >>> staying under 3000 RPM.
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