I have 2 friends both looking to construct some turbo headers/manifolds (which ere you want to call them). I would like to know which is better to fab the headers from, sch 10 304 weld elbows and pipe or a DOM tube like 347 stainless. I know the 347 is better with the heat but does the thinner wall handle it adequately for a turbo application.
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Thread: Turbo Header Questions
01-14-2010, 01:49 PM #1
Turbo Header Question
Last edited by engnerdan; 01-14-2010 at 02:02 PM.Owner
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01-17-2010, 01:04 AM #2
Unless you can bend your own tubes, you're choice of material is 304 or 321, which contains titanium instead of columbium . . . and works just as well in preventing carbide precipitation. I haven't found anyone selling pre-bent 347.
304 works fine for the street where your operating temperatures are relatively low most of the time. It's less expensive and you have the choice of thinwall tubing or schedule 10 weld fittings. The weld fittings are (relatively) inexpensive and tighter radius than the bent tubing, so it's easy to make a compact manifold. On the other hand, the larger radii are better for horsepower.
I've only found 321 available in thinwall tubing but it's the best choice for racing where you'll run "on boost" (high temperature) a high percentage of the time.
01-17-2010, 12:11 PM #3Member
- Join Date
- Oct 2009
This is what I do for a living. If you need help juss shoot me a PM I can guide you in the right direction.
01-17-2010, 01:39 PM #4
01-17-2010, 09:11 PM #5Member
- Join Date
- Aug 2009
I also have some questions about constructing exhaust manifolds.. heres one I got from a friend to refinish but I need to figure out how they make these, I'm sure they're robotic welds but there's got to be a way to get close manually tig welding them.
My main reason for asking about this is I'm constructing some stainless exhausts using 304 material and the welds just aren't up to par with the kind of work I like to put out.
The welds I'm getting now are just discolored and look like ****, they don't have any luster to them, just gray and rough which i know is from too much heat but i like to take my time when I'm welding so there has to be some trick that I'm missing out on.
01-19-2010, 06:43 PM #6Junior Member
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- Jan 2010
Stainless Steel Welding
The headers in the pics are nice!
The reason I'm piping in here NPI I'm a welder, and I learned 20 years ago when welding SS I use Solar Flux to back my welds. Makes a big difference.
You can find it in Ebay.