Manifold turning blue - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 04-03-2011, 04:37 PM   #1
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2009
Location: Toronto, ON
Posts: 1,479
Total Cats: 6
Default Manifold turning blue

Hey guys,

Did a lot of searching and can't find enough info. Why is my manifold turning blue? I know turning colours is part of the tempering process, but everyone else seems to have a gold-ish manifold. Not sure which grade, but it is stainless steel. I'll confirm the grade with Abe.

It turned this colour while sitting and idling for the first time. I've taken it for a quick drive, but haven't driving it hard yet.

dgmorr is offline   Reply With Quote
Old 04-03-2011, 04:52 PM   #2
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,185
Total Cats: 2,582
Default

did you have any oil or solvents on it?
18psi is offline   Reply With Quote
Old 04-03-2011, 05:12 PM   #3
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Stainless can turn blue. Has something to do with high heat and reactions to the environment. If it happens to high end pots and pans, you wash them with lemon juice, and they turn shiny again. Not sure how practical that is in an automotive environmental however.
Ben is offline   Reply With Quote
Old 04-03-2011, 05:35 PM   #4
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2009
Location: Toronto, ON
Posts: 1,479
Total Cats: 6
Default

I actually didn't clean it before mounting it, so it is possible there is some sort of residue. I should have wire brushed it like everyone says to do.
dgmorr is offline   Reply With Quote
Old 04-03-2011, 06:36 PM   #5
Senior Member
iTrader: (5)
 
Join Date: Sep 2009
Location: Lompoc, CA
Posts: 579
Total Cats: 12
Default

If you haven't driven it hard, it's possible that it just hasn't gotten hot enough to turn golden yet. SS turns a sort of blue at a certain temperature, then violet and then gold. Even if it does stay gold-ish, does it really matter?
baron340 is offline   Reply With Quote
Old 04-03-2011, 08:12 PM   #6
Elite Member
iTrader: (2)
 
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,782
Total Cats: 119
Default

I would be more concerned about how that valve cover looks.
Faeflora is offline   Reply With Quote
Old 04-03-2011, 08:36 PM   #7
Senior Member
iTrader: (6)
 
Join Date: May 2009
Location: San Francisco
Posts: 989
Total Cats: 23
Default

Here you go. This is the stages that steel goes through for heat treating. It simply got to only a certain temp while idling. 320 c is like 600 something f. It will turn the gold color after it gets hotter.

http://www.westyorkssteel.com/Heat_T...t/tmpchart.htm
wittyworks is offline   Reply With Quote
Old 04-03-2011, 10:12 PM   #8
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2009
Location: Toronto, ON
Posts: 1,479
Total Cats: 6
Default

Alright, as long as blue is nothing to be worried about.

Yes, the valve cover was a big mistake. It'll be getting powder coated eventually.
dgmorr is offline   Reply With Quote
Old 04-03-2011, 11:35 PM   #9
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Get a bigger hose to the wastegate, thank me later.

In regards to color:

Gold at the head, then a little blue, then that brown/gray color. You haven't put any heat through it yet, so it hasn't changed color. I mean hell, look at your wastegate, mine was that color once.
hustler is offline   Reply With Quote
Old 04-04-2011, 12:16 AM   #10
Elite Member
iTrader: (2)
 
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,782
Total Cats: 119
Default

I've seen a few powdercoated valve covers for sale here recently.

Unless you have a hookup you'll have to pay for blasting and then PC.
Faeflora is offline   Reply With Quote
Old 04-04-2011, 01:21 AM   #11
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Nov 2009
Location: Toronto, ON
Posts: 1,479
Total Cats: 6
Default

It's probably going to cost about the same to get done here as it will be to get one shipped from the US.

The WG hose is temporary, I wanted to run just base boost for a bit and not mess with my MBC.
dgmorr is offline   Reply With Quote
Old 04-04-2011, 01:55 AM   #12
Elite Member
iTrader: (2)
 
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,782
Total Cats: 119
Default

Braided AN vacuum hoses FTW

You just need a

1.0x10mm - AN-4 adapter

Or just ******* slide the damn hose over the tial bung and clamp that bitch on. The rubber hoses can crack. They can also come off if you get oil on the bung. Ask me how I know!
Faeflora is offline   Reply With Quote
Old 04-11-2011, 11:09 AM   #13
Junior Member
 
Join Date: Aug 2006
Location: Cedar City, UT
Posts: 228
Total Cats: 4
Default

blue color on SS means you have gotten it to roughly 600 degrees.. it will change colors as it goes up in temp
Dlaitini 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
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM
ISO 1.6 turbo cast iron manifold cale saurage DIY Turbo Discussion 16 10-01-2015 12:25 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 04:03 AM.