Cam breakin

Engine & Related

  1. Terry Hauck

    Terry Hauck Choadicus

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    Has anyone had a problem ruining new ceramic headers while breaking in a new cam?
     
  2. dmartin

    dmartin Well-Known Member

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    How did you ruin them?
     
  3. Russ69Runner

    Russ69Runner Well-Known Member

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    Do the header's have a problem or are you just asking to make sure you don't hurt the header's.
     
  4. Terry Hauck

    Terry Hauck Choadicus

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    Asking if anyone has heard of this happening.
     
  5. Terry Hauck

    Terry Hauck Choadicus

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    TTI warns you to use an old set of headers at break in or you might ruin the coating. I will be very careful. Thanks
     
  6. 69hemibeep

    69hemibeep Sponge Bob Square Wheels

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    Yeah I'd turn the mixture screws out anyway but at 2k the carb should be transitioning into a cruise circuit not so much idle
     
  7. Coyote

    Coyote Well-Known Member

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    Hmmm? I was not aware of the potential problem. Of course I’ve never had ceramic headers. It may possibly happen because car is stationary with no airflow over headers and continuous running at 2,500-3,000 rpm. If lean it would definitely cook about any finish Shades of blued chrome! Good luck! :thumbsup::beep:
     
  8. Russ69Runner

    Russ69Runner Well-Known Member

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    I agree with the lean mixture. If you put a cam in with bigger lob's then you need more fuel with more air getting in the motor. We put bigger jet's in our carb's when running a bigger cam lift. If it is just a street cam then would open the jet's. Still sometimes you have to put a bigger jet in their. Good luck with the new cam. :thumbsup:
     
  9. IQ52

    IQ52 Member

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    Generally overheated headers comes from the ignition being retarded, the combustion process isn't completed in the chamber and continues in the header. I may have some authority to speak on this as I have my own dyno and run EGT sensors on all cylinders while the engine is on the dyno. I don't recall any case where the engine was lean and cooked the headers.
     
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  10. 69hemibeep

    69hemibeep Sponge Bob Square Wheels

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    Well there you go an expert! But still I had a friend turn his chrome headers blue in short order he left a manifold plug out and caused a real lean condition is what I was going by.
     
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  11. Russ69Runner

    Russ69Runner Well-Known Member

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    I like that a friend turned his header's blue. Thought all of them did that after running them for a while. I see these show cars with all the chrome exhaust on them and no blue mean's they never run the motor. They push them or pull them in for the show. :lol:
     
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  12. Russ69Runner

    Russ69Runner Well-Known Member

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    Yea Coyote aint building no trailer Queen. Going to drive the fool out of it when she is done.
     
  13. Terry Hauck

    Terry Hauck Choadicus

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    Same here. Got Veterans day week off so I will be assembling the engine finally.
     
  14. Russ69Runner

    Russ69Runner Well-Known Member

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    Good luck Terry. With the motor rebuild. :thumbsup:
     
  15. RKNRLR

    RKNRLR Well-Known Member

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    didnt put new headers in my car till after the cam was broken in, but also didnt change the dizzy or carbie, wanted to keep as much of the old stuff there as the car ran good before the new cam. would make any troubleshooting easi(er).

    Also got the new headers coated in black, so probably wouldnt have shown any signs of burning. Cant be too safe though.
     
  16. 6PKRTSE

    6PKRTSE Active Member

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    We have done it both ways. Break in with an old set of junk headers, then install the new ceramic coated headers & then also with just using the ceramic coated headers on my buddies 69' Camaro & it did not burn off during break in but they did discolor some & are not the shiney silver as they were out of the box but still look great after several street years of use..
     
  17. MrJLR

    MrJLR Built - not bought

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    Make sure your timing isn't retarded and don't run it lean and it should be fine.
    I broke in my cam with brand new ceramic headers...no issues.
    Also had a fan in front of the car...

    downloadfile-2.jpg

    Jeff
     
  18. ACME A12

    ACME A12 Plaid Sport Coat Wearing Moderator Staff Member

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    Had the exact same experience on a 340 Duster break-in about a dozen years ago. Just dulled them down a bit for the first couple of inches up near the flanges. Factory coated Hedmans.
     

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