Like Tree0Likes

CMI exhaust

Reply
Old 05-08-2011, 11:03 PM
  #11
Registered
 
Join Date: Mar 2007
Location: Lake Dallas, TX
My Boats: PQ 260/Laveycreft 29MCOB/ Now Boatless :-(
Posts: 1,087
Default

Quote:
Originally Posted by PARADOX View Post
2005 IS NEWER style.
I'm working on a "No leak" header design. Getting close. If I have some time, I will find when CMI sold the Co. and some changes happened.
There is a way to "fix" (or at least help) that problem with the 1/4" gap.
Definitely share your fix to the 525 header problem!!!
bert4332 is offline  
Reply With Quote
Old 05-09-2011, 06:43 AM
  #12
Registered
 
Join Date: Apr 2008
Location: grosse ile, mich
My Boats: 05 cig 42 tiger,w/ 525
Posts: 1,184
Default

Quote:
Originally Posted by Dave M View Post
Well, now I'm confused. I read that "newer" style did not have the outer tubes directly to the flange. My 525 is a 2005 model.
the newer style does not,,,does not ,,,have the outer tube welder to the flange,,
TWIN-SPINS is offline  
Reply With Quote
Old 05-09-2011, 08:39 AM
  #13
VIP Member
VIP Member
 
PARADOX's Avatar
 
Join Date: Dec 2005
Location: Florida
My Boats: Formula 272 Sold, 26 Infinity, 4 sale, 08-33' Avanti 4SALE
Posts: 2,697
Default

Quote:
Originally Posted by bert4332 View Post
Definitely share your fix to the 525 header problem!!!
I don't have a "fix", just some things that will help based on discussions with a lot of people, and companies.
I will elaborate on this later, but to reduce problems at the 1/4" gap, have a good welder weld some beads between the flange and the other tube. 6-8 at each gap/tube. Basically you will thicken the "inner" tube. Less movement, less cracks, more mass, better heat distribution.
This will add "mass" to that area and make it stiffer/stronger.
Just need to be careful don't burn through the tube.
In short the idea is to connect the other tube to the flange also.
Connect the top of the headers with a bar at top of the header. Like a tie rod. This will reduce vibrations and side to side movement. The weakest point is at the smallest area and thinnest. THE GAP.

Last edited by PARADOX; 05-09-2011 at 09:44 AM. Reason: sp
PARADOX is offline  
Reply With Quote
Old 05-09-2011, 08:48 AM
  #14
Gold Member
Gold Member
 
Dave M's Avatar
 
Join Date: Oct 2000
Location: LaPlata, MD, USA
My Boats: 2017 30 Concept, 300 Verados
Posts: 5,221
Default

Quote:
Originally Posted by TWIN-SPINS View Post
the newer style does not,,,does not ,,,have the outer tube welder to the flange,,
That's what I thought. But Paradox said that CMI says that the 1/4" gap is the problem. Wouldn't that would mean that the "newer" sytle is prone to cracks too?

Well, it is what it is......I will just keep a real close eye on mine and hope for the best.
Dave M is offline  
Reply With Quote
Old 05-09-2011, 09:40 AM
  #15
VIP Member
VIP Member
 
PARADOX's Avatar
 
Join Date: Dec 2005
Location: Florida
My Boats: Formula 272 Sold, 26 Infinity, 4 sale, 08-33' Avanti 4SALE
Posts: 2,697
Default

Quote:
Originally Posted by Dave M View Post
That's what I thought. But Paradox said that CMI says that the 1/4" gap is the problem. Wouldn't that would mean that the "newer" sytle is prone to cracks too?

Well, it is what it is......I will just keep a real close eye on mine and hope for the best.
Dave
Read it again. Newer style is NOT WELDED TO FLANGE = 1/4" +- gap.
I did not referenced what CMI said. Others did. CMI did NOT SAY they have ANY problems.

Last edited by PARADOX; 05-09-2011 at 09:42 AM.
PARADOX is offline  
Reply With Quote
Old 05-09-2011, 10:18 AM
  #16
Gold Member
Gold Member
 
Dave M's Avatar
 
Join Date: Oct 2000
Location: LaPlata, MD, USA
My Boats: 2017 30 Concept, 300 Verados
Posts: 5,221
Default

Quote:
Originally Posted by PARADOX View Post
Dave
Read it again. Newer style is NOT WELDED TO FLANGE = 1/4" +- gap.
I did not referenced what CMI said. Others did. CMI did NOT SAY they have ANY problems.
OK, got it, newer = 1/4" gap.

The procedure you described includes adding material to the area of the gap. The GAP is the weak point

So, the newer style is prone to cracking issues too.
Dave M is offline  
Reply With Quote
Old 05-09-2011, 07:35 PM
  #17
Platinum Member
Platinum Member
Thread Starter
Trade Score: (1)
 
Join Date: Sep 2003
Location: Fort Erie Ontario Canada
My Boats: 07 38 Fountain
Posts: 521
Default

is this related mostly to the 525's
JMPH is offline  
Reply With Quote
Old 05-09-2011, 07:52 PM
  #18
Registered
 
Join Date: Oct 2006
Location: Michigan
My Boats: 2004 25 Outlaw SST
Posts: 1,449
Default

Quote:
Originally Posted by JMPH View Post
is this related mostly to the 525's
Mainly 525....more so with staggard 525's....but NOT limited too just those.

Last edited by Baja_man; 05-09-2011 at 09:40 PM. Reason: missing word
Baja_man is offline  
Reply With Quote
Old 05-09-2011, 09:20 PM
  #19
VIP Member
VIP Member
 
PARADOX's Avatar
 
Join Date: Dec 2005
Location: Florida
My Boats: Formula 272 Sold, 26 Infinity, 4 sale, 08-33' Avanti 4SALE
Posts: 2,697
Default

Quote:
Originally Posted by Baja_man View Post
Mainly 525....more so with staggard 525's....but limited too just those.
Noooo... Not limited.. Don't know where did you get this or why you even commenting when you don't know.
Many CMI headers have problems. 496's, 500's ,525's, 600, 700. and even others. 525's are one of the most sold. Thus, most referenced.
PARADOX is offline  
Reply With Quote
Old 05-09-2011, 10:25 PM
  #20
Registered
 
Join Date: Jan 2001
Location: Cincinnati, OH
My Boats: 2012 Proboat MG29
Posts: 710
Default

I thought this "gap" is what CMI called their "cool collar" design that was supposed to be the best thing since sliced bread in the world of water cooled marine tube headers ... rendering those designs without it inferior and obsolete? The direct welded tubes like the old E-Top style are better, now? Are the one's with the "gap" cracking predominantly interally or externally at that junction from one tube to two tubes? I guess I'm confused now.

Last edited by bob_t; 05-09-2011 at 11:50 PM.
bob_t is offline  
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 11:45 PM.


Copyright 2011 OffShoreOnly. All rights reserved.