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Thread: Question about break-in with big springs.
          
   
   

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  1. #1
    69elko's Avatar
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    Question about break-in with big springs.

     



    Okay, I am very close to starting my engine... it is a 396 with a solid flat-tappet cam, so I'm getting worried about break-in failure. I'm wondering if I should take the inner springs out before I start the engine up? Are the springs big enough to cause a problem?

    Here are the spring pressures--- It is a Iskendarian solid camshaft, 240 duration, .530 lift. They are dual springs with an inner damper too.

    8005-A TYPE: dual w/damper DIA.: 1.530"
    RATE: 400 lbs per inch
    INSTALLED HEIGHT: 1.875"
    SEAT PRESSURE: 135 lbs
    OPEN PRESSURE: 395 lbs
    COIL BIND: 1.160"

  2. #2
    techinspector1's Avatar
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    My best advice is don't do it. Replace those springs with some worn-out stockers (single outer). Been there, done that.
    PLANET EARTH, INSANE ASYLUM FOR THE UNIVERSE.

  3. #3
    69elko's Avatar
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    I don't have any worn out stockers, I will try to get some though... would it be ok to just take out the inner springs?

  4. #4
    Ron B.'s Avatar
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    That would be my suggestion, I alway's remove the inner spring. So far no problem's.

    Ron

  5. #5
    erik erikson's Avatar
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    Quote Originally Posted by Ron B.
    That would be my suggestion, I alway's remove the inner spring. So far no problem's.

    Ron
    Ron,nice picture.
    Now there is something you don't see every day.
    A chimp wearing a pink t-shirt with a semi-automatic pistol.

  6. #6
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    I'd go find a set of well worn stockers, lots of people having cam break-in problems lately. Why risk it?
    Yesterday is history, tomorrow is a mystery, Live for Today!
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  7. #7
    Ron B.'s Avatar
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    Quote Originally Posted by erik erikson
    Ron,nice picture.
    Now there is something you don't see every day.
    A chimp wearing a pink t-shirt with a semi-automatic pistol.
    The lighting was off I never wear pink, and that's an old picture I've had my ears pinned back since then, nose job is next.

  8. #8
    kitz's Avatar
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    I would either confirm that by removing the inner spring the rate is very similar to stock or use old ones. I would coat the cam lobes and lifter bottoms with cam break in recommended moly lube and add a couple bottles of GM EOS. I would also make sure the engine oil pump is primed up and ready to go. There's recent stuff in here on oil as well. Seems like the 20W50's are much better for break in than the 5W30's for example.

    Kitz
    Jon Kitzmiller, MSME, PhD EE, 32 Ford Hiboy Roadster, Cornhusker frame, Heidts IFS/IRS, 3.50 Posi, Lone Star body, Lone Star/Kitz internal frame, ZZ502/550, TH400

  9. #9
    erik erikson's Avatar
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    Quote Originally Posted by Ron B.
    The lighting was off I never wear pink, and that's an old picture I've had my ears pinned back since then, nose job is next.
    Your ears seem rather large.

  10. #10
    Racecar100 is offline CHR Member Visit my Photo Gallery
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    They do make breakin Rocker arm to breakin the new cam with out change springs.

  11. #11
    48fordnut is offline CHR Member Visit my Photo Gallery
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    I have a eng standing by to be started with the inners removed. heads came back from my machine shop that way, inners in a box.

  12. #12
    erik erikson's Avatar
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    Quote Originally Posted by Racecar100
    They do make breakin Rocker arm to breakin the new cam with out change springs.
    Yes they do,but not for a BBC.

  13. #13
    69elko's Avatar
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    I'm using HD30 Castrol oil, I bought 2 bottles of GM EOS, I used the supplied moly that came with the cam. I have 3 springs... should I take out both inners and leave just the single outer? or just take out the damper in the middle?

  14. #14
    48fordnut is offline CHR Member Visit my Photo Gallery
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    springs

     



    I would take all the inner springs out..prelube the eng ,make sure the carb has gas, and don't keep turning the eng if it dosen't fire right off. spark and fuel can be determined before eng start.

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