Another Failed Manifold - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 07-27-2008, 03:42 PM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2007
Location: Winona, MN
Posts: 198
Total Cats: 0
Default Another Failed Manifold

Yep they don't last long..


LOOINEY is offline   Reply With Quote
Old 07-27-2008, 03:48 PM   #2
Elite Member
iTrader: (9)
 
Saml01's Avatar
 
Join Date: Jul 2007
Location: NYC
Posts: 5,730
Total Cats: 2
Default

Obx?
Saml01 is offline   Reply With Quote
Old 07-27-2008, 04:11 PM   #3
Junior Member
Thread Starter
 
Join Date: Feb 2007
Location: Winona, MN
Posts: 198
Total Cats: 0
Default

It's the one from CXRacing.com I only had it for 2500 miles and one time on the track
LOOINEY is offline   Reply With Quote
Old 07-27-2008, 04:18 PM   #4
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

Could you take a larger picture of the whole thing so we know there's no question as to which one it is? Or just upload a pic from eBay... don't link the auction as it will be gone in a week, simply ad it as an attachment.
samnavy is offline   Reply With Quote
Old 07-27-2008, 04:35 PM   #5
I'm Miserable!
iTrader: (5)
 
bryantaylor's Avatar
 
Join Date: Dec 2006
Location: jacksonville, fl
Posts: 1,720
Total Cats: 0
Default

just a FYI, my ebay cast mani is STILL holding strong, im frankly suprised
bryantaylor is offline   Reply With Quote
Old 07-27-2008, 04:53 PM   #6
Junior Member
Thread Starter
 
Join Date: Feb 2007
Location: Winona, MN
Posts: 198
Total Cats: 0
Default


LOOINEY is offline   Reply With Quote
Old 07-27-2008, 05:25 PM   #7
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,185
Total Cats: 2,582
Default

ouch.....im thinking if I get one of these maybe have my dad ( professional welder) go over the welds?
18psi is offline   Reply With Quote
Old 07-27-2008, 05:31 PM   #8
I'm Miserable!
iTrader: (5)
 
bryantaylor's Avatar
 
Join Date: Dec 2006
Location: jacksonville, fl
Posts: 1,720
Total Cats: 0
Default

Quote:
Originally Posted by 18psi View Post
ouch.....im thinking if I get one of these maybe have my dad ( professional welder) go over the welds?
the welds are find, the walls are just WAY to thin.
bryantaylor is offline   Reply With Quote
Old 07-27-2008, 05:45 PM   #9
Elite Member
iTrader: (9)
 
Join Date: Jun 2008
Location: Houston, TX
Posts: 1,583
Total Cats: 8
Default

I think it’s a design flaw. Those tabs are cooling down slower than the rest of the manifold. The tab stays expanded for a lot longer while the pipe has already gone full hard and shrunk back and formed itself around the new tab position. Mean while the tab is still shrinking back to its ambient size which is pulling that pipe with a tremendous amount of force to bend it back to the tabs ambient temperature. Those full hard distortions on the pipe and the welds which probably weren’t relieved properly and are already very hard are being slowly strain hardened to be even harder. Sooner or later it’s just like bending a paper clip forward and backward and it snaps.

That crack between 1 & 2 just happened because heat concentrates in the middle. The inside is bulged out while the outsides are a lot cooler during the cool down period. You get the same action going on. It just slowly bends the manifold back and forth until it cracks
TravisR is offline   Reply With Quote
Old 07-27-2008, 05:52 PM   #10
Junior Member
Thread Starter
 
Join Date: Feb 2007
Location: Winona, MN
Posts: 198
Total Cats: 0
Default

I was thinking about welding it back together so i can drive the car but just pointless if it's going to crack again and have to remove it. So now im stuck trying to find a manifold that will work for my td05/t25. Any ideas?
LOOINEY is offline   Reply With Quote
Old 07-27-2008, 06:26 PM   #11
Elite Member
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

cut the flanges off it and replace the shitty thin tubing with weld els.
Arkmage is offline   Reply With Quote
Old 07-27-2008, 08:46 PM   #12
Elite Member
iTrader: (12)
 
Join Date: Jan 2007
Location: Hermosa Beach, CA
Posts: 2,575
Total Cats: 11
Default

Quote:
Originally Posted by bryantaylor View Post
just a FYI, my ebay cast mani is STILL holding strong, im frankly suprised
It looks like the best ebay mani out there.
cardriverx is offline   Reply With Quote
Old 07-27-2008, 09:07 PM   #13
Guest
 
Join Date: Mar 2006
Location: So Cal
Posts: 407
Total Cats: 0
Default

cxracing is local to me...only thing worth buying from them are aluminum pipes for the IC and their front mounts. Their silicone couplers suck ***** too.
krayzrac3r is offline   Reply With Quote
Old 07-27-2008, 09:24 PM   #14
Junior Member
Thread Starter
 
Join Date: Feb 2007
Location: Winona, MN
Posts: 198
Total Cats: 0
Default

Has anyone try the ebay cast manifold with the adapter plate for a td05 or only talked about it. I know it would be a close fit to the hood but i might have to try and see?
LOOINEY is offline   Reply With Quote
Old 07-27-2008, 11:38 PM   #15
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,363
Total Cats: 1,323
Default

The definition of insanity is doing the same thing twice and expecting different results. Buy a quality manifold.
Savington is offline   Reply With Quote
Old 07-28-2008, 12:31 AM   #16
Junior Member
 
Join Date: Dec 2007
Location: Wisconsin
Posts: 49
Total Cats: 0
Default

fwiw, I use a BEGI old school ( think 1999 ) and its still in perfect shape.

But, has anyone tried running a brace from the motor mount to the turbo flange to help support it?
iluvspd is offline   Reply With Quote
Old 07-28-2008, 12:56 AM   #17
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,240
Total Cats: 290
Default

I've been running a brace from the block/mm to the sched 40 dp for about 2k miles and no cracks on my SSA manifold which is probably similar thin wall mild stainless.

I say hand that mani over to a fabricator. He can tie the flanges up, cut out those pipes and weld in new heavier gauge quality pipes and you can then bolt it back up w/o having to change anything else. Get an ewg flange installed while you're at it.
m2cupcar is offline   Reply With Quote
Old 07-28-2008, 09:49 AM   #18
Senior Member
 
Join Date: Mar 2006
Posts: 1,379
Total Cats: 1
Default

Quote:
Originally Posted by m2cupcar View Post
I've been running a brace from the block/mm to the sched 40 dp for about 2k miles and no cracks on my SSA manifold which is probably similar thin wall mild stainless.

I say hand that mani over to a fabricator. He can tie the flanges up, cut out those pipes and weld in new heavier gauge quality pipes and you can then bolt it back up w/o having to change anything else. Get an ewg flange installed while you're at it.
I agree, using weld-els in place of the tubing that failed would provide satisfactory results, I also believe that cutting the flange to allow for expansion and contraction would help as well.

Sometimes these failures are not the fault of the manifold but associated with excessive EGTs. So check that you are not running to lean/to advanced. That can and will kill a thin wall manifold quick.

Mark
Markp is offline   Reply With Quote
Old 07-28-2008, 11:32 AM   #19
Junior Member
iTrader: (7)
 
Join Date: Jun 2005
Location: Texas
Posts: 376
Total Cats: 16
Default

Do you have bracing to the turbo? m2cupcar suggested bracing to me very strongly. He was right!

I've been running a cheap manifold for 13 months of dd with a heavy turbo, around 20 passes at the drag strip, quarter of a track day and probably 150+ autox runs with no problems at all. It is braced.

My (probably incorrect) theory is that you have this heavy object that creates a pretty good moment on the manifold. Maybe not so much the static weight but the vibration and other forces that eventually break the manifold.

At autox there is non stop brutal heating and cooling. 6 to 10 cycles of heavy boost and cooling in 45-60 minutes.

My bracing doesn't so much support the turbo but more dampens any oscillation. It's not pretty but it's worked so far.
dvcn is offline   Reply With Quote
Old 07-28-2008, 08:57 PM   #20
Junior Member
Thread Starter
 
Join Date: Feb 2007
Location: Winona, MN
Posts: 198
Total Cats: 0
Default

Haha FIXED!... So I gave it a swing to see what whould happen and how it would turn out. Don't look to bad I guess. I tryed to grind out the crack a bit the welded it with high amp and low feed. Figure I didnt want it to be all wire. Not sure if im going to use it yet
(The rust is from acid wash when I cleaned it..?)


LOOINEY is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 Yesterday 10:04 PM
Another Cast Manifold Corky Bell Prefabbed Turbo Kits 18 11-22-2016 10:01 PM
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
ISO 1.6 turbo cast iron manifold cale saurage DIY Turbo Discussion 16 10-01-2015 12:25 PM


Thread Tools

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:30 AM.