Ilmor headers
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Ilmor headers

  1. #1
    Senior Member Boss460's Avatar
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    Default Ilmor headers

    Does anyone make water jacketed headers for Ilmor motors besides CMI?

    Had 3 cracked headers in the past year from them and know many others with the same problem.

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  3. #2
    Senior Member Uncle Dave's Avatar
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    I dont believe anyone else does.

    Dont know of this problem with Ilmors, havent read a single exhaust problem thread in the last 3-4 years.

    Are your problems 525 related or other?

    Uncle Dave

  4. #3
    Senior Member Boss460's Avatar
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    2 cracked headers last year on an Ilmor 700. It was always the forward motor and after talking to CMI and Ilmor, the exhaust is now braced. Friend had a 525 forward motor crack on the inside and hydrolocked the motor.

    This is on my 28' Deckboat. The exhaust is so short, vibration shouldn't be an issue. Cracked in the same place at the collector on the inside of the tubes where it can't be rewelded. It's a 625 Ilmor.

    Dave, I know you're also a poster over on another offshore forum. There's a thread there specifically about CMI headers and this issue. I'll PM you the link.

  5. #4
    Senior Member Uncle Dave's Avatar
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    Quote Originally Posted by Boss460 View Post
    2 cracked headers last year on an Ilmor 700. It was always the forward motor and after talking to CMI and Ilmor, the exhaust is now braced. Friend had a 525 forward motor crack on the inside and hydrolocked the motor.

    This is on my 28' Deckboat. The exhaust is so short, vibration shouldn't be an issue. Cracked in the same place at the collector on the inside of the tubes where it can't be rewelded. It's a 625 Ilmor.

    Dave, I know you're also a poster over on another offshore forum. There's a thread there specifically about CMI headers and this issue. I'll PM you the link.

    Thanks- sorry you are having an issue.

    I should say other than your deckboat post this weekend Im not aware.



    UD

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