Fab tubing for hotside?
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I would use sch 40 mild steel. It has a few qualities that make it good for a typical truck manifold build. Such as, it's strong and resilient. It does not expand and shrink as much as stainless. You don't have to back purge it which saves time and money. The inner diameter of just over 2" will keep the velocity of the exhaust gasses up and the thick wall will retain the heat and carry more of it to the turbine.
You could use the sch 10 stainless as it is pretty strong and should support the weight of the turbo better than the typical 16 gauge tube. The inner diameter of sch 10 is around 2.15" and will support a little more. The price of the bends or the pipe elbows are not too far off.
Here is the crossover i did for a gto in sch 10 2". It uses 21/4" vbands and crimped 21/2 flex bellow. It is back purged.
http://www.engineeringtoolbox.com/th...pvc-d_782.html
http://www.engineeringtoolbox.com/th...pvc-d_782.html
Consider the gas turbo pipes see...superheated carbon dioxide, water, nitrogen, plus some other scarcer stuff like OH, and CO. Corrosion happens much faster the hotter you get as well.
Not trying to stir anything either, just putting out information. I have a mild steel sch40 log and 304 crossoverpipe and downpipe. The log, even being thick *** sch40, has had to be repaired because of cracks and leaks and not to mention looks horrible because of the outside coking and flaking off. The stainless parts look brand new, just goldish in color.


