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  1. #1
    Senior Member NO BUTT NO PUTT's Avatar
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    Default oooopss.....

    Lost a cam lobe today.
    Damn it.
    Ideling too long will do that.
    Fock it, time to upgrade alittle.

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  3. #2
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    ATTA BOY 460's Avatar
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    Could there have been sumthing going wrong before today?

    Kind of odd that a lobe goes flat from idling to long. Sorry to hear it blew up

  4. #3
    Senior Member Boat 405's Avatar
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    Quote Originally Posted by NO BUTT NO PUTT View Post
    Lost a cam lobe today.
    Damn it.
    Ideling too long will do that.
    Fock it, time to upgrade alittle.
    dude, really...... didn't you just go thru this with the old boat? Next time would you please put roller lifters in.... call me

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    Quote Originally Posted by widowmaker View Post
    ... Next time would you please put roller lifters in....
    X2

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    Red Blooded American The Doctor's Avatar
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    My sons just finished a BBC with a brand new flat tappet cam last week and broke it in on the dyno but the cam went flat during break-in. Now, before you school us on how to break in a flat tappet cam, we generously used "Isky cam lube" (molybdenum disulfide paste), used GM EOS in the oil and kept the initial RPM at 2000+ during break-in - the same as we have for thirty years on who-knows-how-many engines. Didn't matter! Called Ray at Doug Herbert performance where the cam and lifters almost always come from and they had also just finished up a new flat tappet cam and also lost some lobes on break-in. Complete tear down, clean-up, and rebuild with roller camshaft is the only answer for us.

    There have been too many recent changes in motor oils due to EPA requirements. You can't even get Delo or Rotella with zinc any more and we seem all but doomed to use rollers in everything we build from here on out. Not a terrible option but sure takes the fun out of a weekend of skiing/boating when you stop to adjust lifters. Worst news of all is that we now even run the risk of wiping out cams and lifters on well-broken in units that have years of service on them due to the lack of protection. This clean environment is going to be very costly. We've just seen the tip of the iceburg.
    The best things in life aren't things!

  8. #6
    Broke mo fo djunkie's Avatar
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    Quote Originally Posted by The Doctor View Post
    My sons just finished a BBC with a brand new flat tappet cam last week and broke it in on the dyno but the cam went flat during break-in. Now, before you school us on how to break in a flat tappet cam, we generously used "Isky cam lube" (molybdenum disulfide paste), used GM EOS in the oil and kept the initial RPM at 2000+ during break-in - the same as we have for thirty years on who-knows-how-many engines. Didn't matter! Called Ray at Doug Herbert performance where the cam and lifters almost always come from and they had also just finished up a new flat tappet cam and also lost some lobes on break-in. Complete tear down, clean-up, and rebuild with roller camshaft is the only answer for us.

    There have been too many recent changes in motor oils due to EPA requirements. You can't even get Delo or Rotella with zinc any more and we seem all but doomed to use rollers in everything we build from here on out. Not a terrible option but sure takes the fun out of a weekend of skiing/boating when you stop to adjust lifters. Worst news of all is that we now even run the risk of wiping out cams and lifters on well-broken in units that have years of service on them due to the lack of protection. This clean environment is going to be very costly. We've just seen the tip of the iceburg.
    There is hydraulic roller lifters/and cams out there that don't require adjusting like solid lifters.

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    Senior Member Boat 405's Avatar
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    Quote Originally Posted by djunkie View Post
    There is hydraulic roller lifters/and cams out there that don't require adjusting like solid lifters.
    True, and some of the solid stuff can be designed to have up to 100 hours between lash adjustments and still make good power. Even better yet the pressure fed lifters these days are awesome specifically designed for long idle periods.

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    Red Blooded American The Doctor's Avatar
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    Quote Originally Posted by djunkie View Post
    There is hydraulic roller lifters/and cams out there that don't require adjusting like solid lifters.
    We have them in fresh a built 468 in our shop as I type. They are definitely not the only answer to this problem especially when considering price. They are one option however. Now, DJ, if this answer somehow offends you, please PM me to deal with it rather than ruining another perfectly valid thread.
    The best things in life aren't things!

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    Broke mo fo djunkie's Avatar
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    Quote Originally Posted by The Doctor View Post
    We have them in fresh a built 468 in our shop as I type. They are definitely not the only answer to this problem especially when considering price. They are one option however. Now, DJ, if this answer somehow offends you, please PM me to deal with it rather than ruining another perfectly valid thread.
    Get over it. Phuck I was only trying to help.

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    NW Spectraholic Malcolm's Avatar
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    Quote Originally Posted by The Doctor View Post
    We have them in fresh a built 468 in our shop as I type. They are definitely not the only answer to this problem especially when considering price. They are one option however. Now, DJ, if this answer somehow offends you, please PM me to deal with it rather than ruining another perfectly valid thread.
    What's with the red letter edition?
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    Quote Originally Posted by The Doctor View Post
    We have them in fresh a built 468 in our shop as I type. They are definitely not the only answer to this problem especially when considering price...
    Are you saying roller cams go flat or?

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    Red Blooded American The Doctor's Avatar
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    Quote Originally Posted by hotrod56cars View Post
    Are you saying roller cams go flat or?
    Not at all! I was saying it is one alternative we use to combat the ever-growing problem of wiping out flat tappet camshafts and lifters.
    The best things in life aren't things!

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    Senior Member carreradude's Avatar
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    This same BS happened to me in my 496 BBC. I had cam lube all over everything, had cam break-in added to oil. The engine fired right up and I took it right to 2000-2500 rpm and after 10 min I noticed it was running rough. came down to an idle and heard the old rocker clickty clack. I knew what happened before I pulled a valve cover off. Needless to say, I put a hydrolic roller in it and will never run a flat tappet in anything again!! Hell, If I rebuild my lawn mower, I will find a roller for it too!!

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    Sit N' Spin Jetaholic's Avatar
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    Have you guys thought to try a racing oil, such as Valvoline VR-1 or equivalent? Off road and racing oils all still have the ZDDP additive in them. That's how the oil companies are able to get away with keeping zinc in the oil is to market it as a "racing/off road" type of oil.

    Also, for those running dual w/damper springs, you're supposed to break the cam in without the inner spring installed as well. You don't want full spring pressure on the cam during break-in. All cam manufacturers specifically state this in their break in instructions.

    Here is a link containing information about the zinc/phosphorous (ZDDP) additive and the EPAs restrictions on it. Straight from the Valvoline site. Also, their VR1 racing oil is advertised to contain 75% higher zinc content than conventional motor oils. Check it out.

    http://www.valvoline.com/downloads/2008-003a.pdf
    Last edited by Jetaholic; 01-18-2009 at 09:41 PM.



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    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

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