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what about bracing the downpipe? that can help significantly also as it has a good bit of leverage on the turbo.
FM sold (sells?) a brace for their downpipes years ago. I ran one for a short time with no issues. Some people found that the exhaust clamp would crush the downpipe some after time though. Others theorized that a brace could act as a pivot point for the system and and exaggerate the exhaust torque on the downpipe. I think it was Bob Bundy would posted a picture of his custom "wider" U bracket similar to what FM sold that he had used for awhile without issue.
One of the things I learned about 321 is that it contains titanium. The titanium helps stabilize the metal when being welded, and makes it a lot less brittle after welding.
I went with 321 sched 40, because 347 was cost prohibitive. 316 flanges.
Everyones experience and help is greatly appreciated.
I think a bracket with this basic design bolted to the downpipe flange will work well, I intend to use the same sized material as the MSM which I believe is 4mm. Ive contacted my laser cutting place and design guy and they can both do it easily the only question is tracking down a business who can bend the steel with a small radius to help eliminate the chance of cracking the highest stressed parts on the bends.
Does anyone here know enough about material selection for a job like this? Perhaps point me to a "metal selection for dummies" resource?
410 or 420 (I forget which one is better for bending) would be my choice. To do the bending you can just make your own form. Make a 90deg block (might have to be closer to like 88° depending on spring back) and weld a round of the same inside bend radius you want to the end of an arbor for your hydraulic press and I think you can figure out the rest.
One of the things I learned about 321 is that it contains titanium. The titanium helps stabilize the metal when being welded, and makes it a lot less brittle after welding.
I went with 321 sched 40, because 347 was cost prohibitive. 316 flanges.
Yup, 321 uses Ti to stabilize. 347 is essentially identical chemically but uses Niobium instead. The stabilizing element reduces the tendency to form chromium carbides when heated, so they are less likely to suffer intergranular corrosion.
Really though, it's the higher creep rupture characteristics of 321/347 at temperature that give them an edge in a manifold application.
I would like to see 309 or 310 used as they take it to the next level with more nickel. Of course then there's inconel and other nickel based superalloys...
TIL there are two names for Columbium (you goddamn communist).
Wow, I never knew that. Huh. Had to wikipedia that shiz. Interesting: "... the IUPAC accepted tungsten instead of wolfram in deference to North American usage; and niobium instead of columbium in deference to European usage."
I kinda wish we had stuck with columbium so that we can have wolfram instead. Wolfram!
I would extend the tab down to the base plate. As you have it now, there will be a lot of stress on the smallest weld. Extending the tab down transfers load to the base plate
Looks like it could benefit from some gusseting; does not look particularly stiff in bending. I very much prefer Dann's design, especially with the proposed tab extension
05-23-2017, 05:51 PM
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