(Quick Fab) China Manifold Replacement - 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 09-03-2013, 10:42 PM   #1
Newb
Thread Starter
 
Join Date: Feb 2013
Location: Ocean City MD
Posts: 22
Total Cats: 8
Default (Quick Fab) China Manifold Replacement

Despite all the warnings I, like so many others, purchased a chinafold.
I need to learn the hard way, that's just how I am.
So i finally I got tired of the mess I was creating under my hood with failed reinforcement attempts. This was the last straw.

I've been meaning to place an order with Stahl for some mandrel pieces and the flanges, for a proper header build, but I've been procrasterbating allot lately.
So on my day off, armed with my welder, some 2" aluminized pipe, and a crush bender, i started to craft my own.

I started by making a jig:




my plan was to reuse the flanges: (cut and cleaned them up a bit)


I was weary about using the flanges with the mild steel. I figured that would be my weak point.

The bender limited me to a 6" radius bend( to wide for a manifold).

My solution was to bend the pieces, cut the radius's short, then swell the ends to maintain a constant radius of about 2".

By all means this is not the right way to do this, this is just a temporary solution brought on by weeks of frustration.

My original plan was to create a log manifold but i got carried away.













Like i said earlier this is not correct way to fabricate a manifold. I took no consideration for the runner length. I just made sure the collector wasn't creating a mess of turbulence between 1 and 4.

After it was welded together i was able to port the flanges quite a bit to accommodate the larger runners.

Comparing the 2 manifolds:


My welds started to get sloppy towards the end. It was pushing midnight and I was getting tired.

installed:







I header wrapped it shortly after this photo.

All in all it was a fun experience, and I now have a nice jig to work with when the real parts get here.

So far Its been almost 1k miles and no cracks. Which is better than the chinafold did. The tone of the exhaust is much different than before. Most likely because of the size and unequal length of the runners. Its much deeper now and has a subaru boxer rumble at 4k rpm and up. Very unique in my opinion. I will be taking it to the drag strip tomorrow night to see how my time will be effected by this new custom addition.

p.s. Power seems just as good, if not better than before, but its hard to say since its been a hot couple of days.

Hope this was a somewhat interesting read for everyone.
Attached Thumbnails
(Quick Fab) China Manifold Replacement-bmkc.jpg   (Quick Fab) China Manifold Replacement-aiw6.jpg   (Quick Fab) China Manifold Replacement-3vcp.jpg   (Quick Fab) China Manifold Replacement-j9wg.jpg   (Quick Fab) China Manifold Replacement-w4lk.jpg  

(Quick Fab) China Manifold Replacement-hvco.jpg   (Quick Fab) China Manifold Replacement-mq6x.jpg   (Quick Fab) China Manifold Replacement-b02v.jpg   (Quick Fab) China Manifold Replacement-b44m.jpg   (Quick Fab) China Manifold Replacement-udu6.jpg  

(Quick Fab) China Manifold Replacement-oewh.jpg   (Quick Fab) China Manifold Replacement-piu3.jpg   (Quick Fab) China Manifold Replacement-3ky7.jpg  
Charmin89 is offline   Reply With Quote
Old 09-03-2013, 11:00 PM   #2
Elite Member
iTrader: (1)
 
Join Date: May 2009
Location: Jacksonville, FL
Posts: 4,687
Total Cats: 216
Default

Attached Thumbnails
(Quick Fab) China Manifold Replacement-data-collector_zps730522b7.jpg  
Full_Tilt_Boogie is offline   Reply With Quote
Old 09-03-2013, 11:46 PM   #3
Junior Member
 
Join Date: Jul 2013
Location: SanDiego
Posts: 53
Total Cats: 5
Default

you could have made the collector shorter to give the runners a little more radius and a straighter shot to the turbo but its better than some of the other manifolds ive seen here.
ThunderKunt is offline   Reply With Quote
Old 09-05-2013, 11:16 AM   #4
Elite Member
iTrader: (1)
 
Join Date: May 2009
Location: Jacksonville, FL
Posts: 4,687
Total Cats: 216
Default

Quote:
Originally Posted by ThunderKunt View Post
its better than some of the other manifolds ive seen here.
Really? Show me one.
Full_Tilt_Boogie is offline   Reply With Quote
Old 09-05-2013, 11:22 AM   #5
Elite Member
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,640
Total Cats: 25
Default

...Wow..

Dann
nitrodann is offline   Reply With Quote
Old 09-05-2013, 11:26 AM   #6
Elite Member
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit
Posts: 4,201
Total Cats: 260
Default

Quote:
Originally Posted by Full_Tilt_Boogie View Post
Really? Show me one.
+1


And that's by no means dissing you OP. Good job with building something for yourself. With probably $10 in material there, it is good practice for when the nice good stuff comes. Which i hope turns out nothing like this. haha
Erat is offline   Reply With Quote
Old 09-05-2013, 11:40 AM   #7
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,907
Total Cats: 1,793
Default

I give you props for doing it, but I wish you tried a little harder.
Braineack is online now   Reply With Quote
Old 09-05-2013, 11:42 AM   #8
Elite Member
iTrader: (2)
 
Join Date: Aug 2012
Location: Indianapolis
Posts: 3,325
Total Cats: 235
Default

Quote:
Originally Posted by Full_Tilt_Boogie View Post
Quote:
Originally Posted by ThunderKunt View Post
its better than some of the other manifolds ive seen here.
Really? Show me one.
Technically not from this site but it was posted here...

thenuge26 is offline   Reply With Quote
Old 09-05-2013, 11:44 AM   #9
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,907
Total Cats: 1,793
Default

I'd prefer that one.
Braineack is online now   Reply With Quote
Old 09-05-2013, 11:53 AM   #10
Senior Member
iTrader: (8)
 
Join Date: Jan 2012
Location: Azusa, CA
Posts: 1,376
Total Cats: 80
Default

Quote:
Originally Posted by Braineack View Post
I'd prefer that one.
why? the 1 and 4 runners are perpendicular to the turbo inlet and inline with eachother. While not pretty, at least the OP doesn't have exhaust gases flow opposing each other
cyotani is offline   Reply With Quote
Old 09-05-2013, 11:55 AM   #11
Slowest Progress Ever
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,812
Total Cats: 187
Default

Lol! I'm waiting for "nothing is good enough for you guys". I can't wait to post pics of my new setup so I can get props for trying, but critized at the same time.
Props on making that jig. What type of welder did you use? Obviously it was mig, but I mean, was it a small 110v unit?
thirdgen is offline   Reply With Quote
Old 09-05-2013, 11:55 AM   #12
Elite Member
iTrader: (8)
 
Ryan_G's Avatar
 
Join Date: Jan 2012
Location: Tampa, Florida
Posts: 2,579
Total Cats: 155
Default

Given the nature of the project being a quick temporary fix I thought it was a success. Definitely an entertaining read with the funny pictures. I feel like if I actually tried with my current fabrication abilities I would end up with a product similar to or worse in quality especially if I did it all in one day.
Ryan_G is offline   Reply With Quote
Old 09-05-2013, 12:01 PM   #13
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,907
Total Cats: 1,793
Default

Quote:
Originally Posted by cyotani View Post
why? the 1 and 4 runners are perpendicular to the turbo inlet and inline with eachother. While not pretty, at least the OP doesn't have exhaust gases flow opposing each other
they aren't flowing "into" each other; they won't collide like atoms and explode. #1 and #4 don't fire at the same time so it doesn't even matter.

But if that's your argument for what makes one better than the other, I suggest you look closely at OP's #1 and #4 as well.
Braineack is online now   Reply With Quote
Old 09-05-2013, 12:11 PM   #14
Senior Member
iTrader: (8)
 
Join Date: Jan 2012
Location: Azusa, CA
Posts: 1,376
Total Cats: 80
Default

Quote:
Originally Posted by Braineack View Post
they aren't flowing "into" each other; they won't collide like atoms and explode. #1 and #4 don't fire at the same time so it doesn't even matter.

But if that's your argument for what makes one better than the other, I suggest you look closely at OP's #1 and #4 as well.
they don't fire at the same time but a car reving at 6000 rpm will fire each cylinder 50 times a second. or once every 20 ms. I don't think 20ms is enough time for all the gas to escape. And they won't explode but im pretty sure you'll get very inefficient turbulent flow at the collector and the turbo won't spool as quickly with the air molecules loosing velocity (energy) in order to get redirected down towards the turbo.


edit: OP's isn't much better but that second manfold almost looks like it directs the exhaust gas away from the turbo. The OP's is at least partially angled toward the turbo
cyotani is offline   Reply With Quote
Old 09-05-2013, 12:14 PM   #15
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,907
Total Cats: 1,793
Default

true: I had a log manifold once, the turbo wouldn't spool; the exhaust clogged the outlet like I clog my toilet.
Braineack is online now   Reply With Quote
Old 09-05-2013, 12:16 PM   #16
Elite Member
iTrader: (1)
 
Join Date: May 2009
Location: Jacksonville, FL
Posts: 4,687
Total Cats: 216
Default

Quote:
Originally Posted by cyotani View Post
tyou'll get very inefficient turbulent flow at the collector
Are you not seeing the OP's collector?
Full_Tilt_Boogie is offline   Reply With Quote
Old 09-05-2013, 12:17 PM   #17
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,465
Total Cats: 784
Default

Quote:
Originally Posted by Braineack View Post
true: I had a log manifold once, the turbo wouldn't spool; the exhaust clogged the outlet like I clog my toilet.
Ever notice that when the clog finally gets overcome, the water rushes REALLY hard?

Clearly the clog is key to peak power.
concealer404 is offline   Reply With Quote
Old 09-05-2013, 12:17 PM   #18
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,907
Total Cats: 1,793
Default

I'm going to be in OC next week. has i can the old manifold?
Braineack is online now   Reply With Quote
Old 09-05-2013, 12:25 PM   #19
Senior Member
iTrader: (8)
 
Join Date: Jan 2012
Location: Azusa, CA
Posts: 1,376
Total Cats: 80
Default

Quote:
Originally Posted by Braineack View Post
true: I had a log manifold once, the turbo wouldn't spool; the exhaust clogged the outlet like I clog my toilet.
touche. so I guess not a big deal in the larger scheme of things...

but still: log mani < random manifold < OP manifold < all other well designed manifolds?


Also last time I had toilet clogging problems my land lord told me to keep a tree branch in the bathroom and poke at the stool till it goes down (true story).
cyotani is offline   Reply With Quote
Old 09-05-2013, 12:26 PM   #20
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,465
Total Cats: 784
Default

Well there's your problem. Stop putting your stool in the toilet.
concealer404 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
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 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 12:23 PM.