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Old 05-18-2011, 04:58 PM
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The year is now 2011. How are new CMI headers for an HP500EFI? CMI made the pipes for my Formula and I need to replace these as they are 10 years old now. Would the new ones be good?
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Old 05-19-2011, 09:02 PM
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Originally Posted by KEPP View Post
The "Gap" as commonly referred to is what CMI call's their Cool Collar it is a patented design that they chose to switch to. You will find in the case of the 525,600 and 700 Merc engine header failures they have nearly nothing to do with flange failures but that of rotting out internally. As so many different posts have referred to.

We sell both the CMI GEN-X header http://www.keitheickert.com/p-14849-...0-engines.aspx

and the New Hardin Hurricane Lite as direct replacement headers for this application to reference two different styles. http://www.keitheickert.com/p-15770-...mi-flange.aspx

Thanks for the post, but what difference would "internal rotting" make with or without the "cool collar". Where is this internal "rotting" happening and why?

Giving this some thought myself, I now have more questions. It seems to me the weakest part of a header design is the weld and not the unmodified portion of a stainless tube. To avoid getting water inside the exhaust tube if a weld leaked, they moved the water jacket weld away from the flange. This way if there was a leak on that water jacket weld, it would leak OUTSIDE and not go into the engine via the exhaust port.

So if it doesn't leak there at the weld, it has to be internal. Is the inside pipe getting too hot due to lack of water flow? Is the inside pipe not centered within the outer water jacket pipe? How is the inner pipe kept floating in the center of the water jacket pipe?

These pictures are of the "cool callar" type. To me the rusty one is an external weld leak and would not have caused water to get in the engine causing a failure.

Talking out loud here!
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Old 05-21-2011, 09:46 AM
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Nort,
I don't believe that the 500 EFI's had that many problems, You are a testment to that, getting 10 years our of your CMI's, E-tops I think. The problems really started with the CMI "Sweeper" headers, (I.E. HP525, 600sci, 700 sci). Check with Teague and see what he recommends, he should be able to give you some good options, since I think he carries a few different headers. If it were me, I would look at some KE's, (my personal choice), IMCO Power Plus, or the Stainless Marine gen II or III. I have not heard anything bad about Stellings either
Hope this helps,
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Old 05-21-2011, 12:57 PM
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I appear to be reinstated. Thread is up too. I will play by the rules, the following was sent to me from OSO.

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Old 05-21-2011, 01:15 PM
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I appear to be reinstated. Thread is up too. I will play by the rules, the following was sent to me from OSO.

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Old 05-21-2011, 01:39 PM
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............................

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Old 05-21-2011, 02:00 PM
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I appear to be reinstated. Thread is up too. I will play by the rules, the following was sent to me from OSO.

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Welcome back Smarts
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Old 05-21-2011, 05:38 PM
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Old 05-27-2011, 09:30 AM
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I am going next week to look at 07 600 boat, I scared now?
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Old 05-27-2011, 09:47 AM
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Here's what I don't get, after all these failures, why are people still buying ANYTHING from CMI? Some are even fixing their motors that were damaged by CMI headers and then buying new CMI's to replace the old ones. I wouldn't spend a dime with CMI simply based on their lack of response to the well documented failures of their product......
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