misfit77
Proven Member
- 62
- 3
- Jun 6, 2015
-
vail,
Arizona
"Stainless Steel exhaust" My ass! My garage floor looks like a red desert.
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How about 321 for exhausts and manifoldsIts going to the 409 grade so it will rust, its cheaper then 304 and alot cheaper then 316/321 they use it because they can get away with calling it SS but infact it is a bad grade of it. If it was never heated up it would never rust! The heat is what caused it to rust as the moisture gets trapped and then forms the surface rust! Inside will be worse aswell.
409 system can last 5-9 years give or take and a 304 system can be from 10-30 years give or take. 304 can still rust as its not fully pure like 316 is and 316 is the best ss to use every where really but at a high cost,
What brochure was this your talking of?
321 is not best for systems but manifolds yes as they deal with rapid temps really well, but they are more prone to cracking at the welds more, 316 is best all around but 321 holds the heat better then the rest, after 321 the best option is inconel!How about 321 for exhausts and manifolds
It dont always work like as intended! Even with purging it will still go brittle! 99% of the time its next to the weld but thats because its had heated and there for work hardened so is weaker in general because its more brittle. If i was to make a manifold for my turbo i most likely would use 321 myself for its high heat ratings but i would not expect it to last more then a few years or less in racing. I chatted to a chap who had all 3 types on his evo 9 and not 1 lasted for his car so paid 3600 for an inconel one to be made was 0.80mm weighed nothing but had it for 4+ years and i am assuming still has it. He had money as his system was titanium so no webs in his wallet .Thats why you just have to make sure your welds are good and follow post heat processes if applicable.
Ya...a millisecond after I did it, I realized what an iditot I am.Tasted salty, eh? You are brave.
how long was the evaporust originally on? I usually leave it on over night. I sand/wire wheel the rust as far back as possible, then I use evaporust or similar. Then I let it sit over night. Then I wire wheel the evapo rust stuff off. then use acetone. Soapy water is not good enough imo.