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Cmi Headers/525 Efi Problems?

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Old 05-04-2008, 10:35 AM
  #11
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Originally Posted by CIGARETTE 1972 View Post
stainless marine.......

money no object-EICKERTS!
go with the stainless marine mainifold's , you mit loose some bling but they will last a long long time . they come with a 5 year waranty i believe .
just dont run the cmi's when they leak real bad you will blow your motor and then it will realy cost ya
good luck
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Old 05-04-2008, 11:24 AM
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when my engine was on the dyno , mark highly recomends using the exhaust that is going to be used in the boat.

i have the gen 2's and was told that if i had cmi's or any tube type i would have seen more hp- but , i was looking for long term reliability.

i feel for the people who bought cmi's or have to keep dealing with issues of leaking..

those polished pipes sure do "bling up" the bilge , but seems for the added headaches that so many have been through it's not worth the hp...



that's just my look on it.......
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Old 05-04-2008, 12:50 PM
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I was told that CMI makes two types of headers , The one's that are leaking and the one's that are going to leak.
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Old 10-05-2008, 06:22 PM
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Default CMI Issues

Read this thread and all the posts . .

I have a set of CMIs on a small block Ford in a Donzi, brand new, with 5 hours use.

today I removed both headers and found 6 of eight tubes leaking water internally . .

the details are on Donzi.net at:

http://www.donzi.net/forums/showthre...383#post470383

This is a CMI problem. AFAIK Mercury Marine bought CMI last year, as I had to wait 11 months to get my system . . I selected CMI as no one else made anything for a SBF. At the time I was told by the dealer I dealt with that all production was focused on the 525 Mercury needs, and everything else was sidelined.
Regardless of production needs it seems that there is a major failure in quality and inspection. As a former fabricator of SS tube systems, this is NOT rocket science, but basic welding. I can see many flaws in the work, and feel that we need to take this a step further.

I will be discussing this with CMI this week, and am open to any direct discussions regarding these failures.

Please post me directly at: [email protected]

title the email with "CMI" . .

thank you,
Mario Langsten

Bow, NH
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Old 10-05-2008, 06:58 PM
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Originally Posted by Mario L. View Post
Read this thread and all the posts . .

I have a set of CMIs on a small block Ford in a Donzi, brand new, with 5 hours use.

today I removed both headers and found 6 of eight tubes leaking water internally . .

the details are on Donzi.net at:

http://www.donzi.net/forums/showthre...383#post470383

This is a CMI problem. AFAIK Mercury Marine bought CMI last year, as I had to wait 11 months to get my system . . I selected CMI as no one else made anything for a SBF. At the time I was told by the dealer I dealt with that all production was focused on the 525 Mercury needs, and everything else was sidelined.
Regardless of production needs it seems that there is a major failure in quality and inspection. As a former fabricator of SS tube systems, this is NOT rocket science, but basic welding. I can see many flaws in the work, and feel that we need to take this a step further.

I will be discussing this with CMI this week, and am open to any direct discussions regarding these failures.

Please post me directly at: [email protected]

title the email with "CMI" . .

thank you,
Mario Langsten

Bow, NH
Good luck !!!!!
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Old 10-06-2008, 09:03 AM
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Mario,

I saw the pics at 5 hours those are down right scary
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Old 03-24-2009, 09:07 PM
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I have had a leaking header on each motor. THIS SUCKS!
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Old 03-24-2009, 10:37 PM
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Originally Posted by 38Lightning View Post
I have had a leaking header on each motor. THIS SUCKS!
They cost me 4 engines on my Cig with 525 efis
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Old 03-24-2009, 11:05 PM
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what years? models? all leak? or pre cool collar? only 03/04 years? new supports fix problem? stock merc version? or the cmi version is the solution?

whats the fuul story and solution?
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Old 03-24-2009, 11:07 PM
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LS, What did you do? Doug
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