One Stressed Out 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 08-10-2006, 05:14 PM   #1
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default One Stressed Out Manifold

This is what happens when you stress your manifold:

This is between runner 2 & 3. This is what had cracked before. The white stuff is cold weld, I couldn't tell if it was cracked or not at first, so I applied it and let it cure. After a few minutes of driving a crack delevoped in it.



This is the bottom of runner #1. Notice the cut I had to make in the runner to remove it from the block. I had to pound the hell out of it with a hammer to bend it back since it was warped so bad:



The flange:



Runner #4:

Braineack is offline   Reply With Quote
Old 08-10-2006, 05:26 PM   #2
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

BTW, my new manifold and DP are in the finishing stages. It's shipping tomorrow 3-day. Should have it on Wednesday and get my baby all back together next weekend! Then I'll dyno tune her next Friday and go to the track Sat & Sun and see what else I can break.
Braineack is offline   Reply With Quote
Old 08-10-2006, 05:51 PM   #3
Junior Member
 
Sirnixalot's Avatar
 
Join Date: Aug 2005
Location: Cayman Islands
Posts: 440
Total Cats: 17
Default

damn homie thats a **** load of cracks!

cant wait to see pix of your new setup
Sirnixalot is offline   Reply With Quote
Old 08-10-2006, 08:59 PM   #4
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,244
Total Cats: 291
Default

Those cracks are running through center of the welds (bottom pics)- that's bad. If those were good welds it would have cracked to one side or the other from the stress. Who made the manifold? - rob
m2cupcar is offline   Reply With Quote
Old 08-10-2006, 09:23 PM   #5
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

I bought the manifold used. It's a JGS manifold. The welds there were grinded down and TIG welded.
Braineack is offline   Reply With Quote
Old 11-16-2006, 04:30 AM   #6
Junior Member
 
Join Date: Oct 2006
Posts: 312
Total Cats: 0
Default

Did JGS end up doing your new manifold and how did that turn out?

I assume the original welder did a crappy job because every manifold I have seen from JGS has been rock solid. Mine has endured 1400-1700 degree temperatures for nearly 4 years now, with zero signs of quitting.
beerslurpy is offline   Reply With Quote
Old 11-16-2006, 09:12 AM   #7
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

Ouch.
TurboTim is offline   Reply With Quote
Old 11-16-2006, 10:33 AM   #8
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,244
Total Cats: 291
Default

I bet that braineack puts his turbo stuff through 10x the punishment of anybody else here because he does track events. It's like a drag racing from corner to corner for 20 minutes straight. I saw one of racing mazda's tubular manifolds crack at the end of it's second 20 minute session at a track event. And it had additional gussets added for strength. It's got to be a combination of the perpetual boost (heat) and the bouncing off of curbs, excessive and repeated load changes. It's hardcore abuse. - rob
m2cupcar is offline   Reply With Quote
Old 11-16-2006, 10:41 AM   #9
Elite Member
iTrader: (8)
 
Join Date: Sep 2006
Location: Severn, MD
Posts: 1,927
Total Cats: 5
Default

He should probably go with a cast manifold.

Frank
fmowry is offline   Reply With Quote
Old 11-16-2006, 10:49 AM   #10
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

i did. I have a BEGi manifold and downpipe now.
Braineack is offline   Reply With Quote
Old 11-16-2006, 01:32 PM   #11
Junior Member
 
Join Date: Oct 2006
Posts: 312
Total Cats: 0
Default

I'm just amazed that 9psi through a T3 in a 1.6L is putting that much stress on the manifold. That is a really free flowing setup for that size engine. What are your sustained EGTs?
beerslurpy is offline   Reply With Quote
Old 11-16-2006, 01:42 PM   #12
Boost Czar
Thread Starter
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

I think it had to do with the DP have no flex they way I had it mounted.



there used to be a bracket there.
Braineack is offline   Reply With Quote
Old 11-16-2006, 02:52 PM   #13
Senior Member
 
Join Date: Jan 2005
Posts: 737
Total Cats: 0
Default

Quote:
Originally Posted by braineack View Post
I think it had to do with the DP have no flex they way I had it mounted.



there used to be a bracket there.
ahh yes the "lower backpressure mod" thats a nice one.
F20turbo 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 59 12-15-2017 09:00 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 05:21 AM.