Stainless exhaust -- rust or not? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 02-22-2008, 02:17 AM Thread Starter
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Quote:
Originally Posted by jpscustoms
better get you stock exhaust rusty......

Leave the DPF outside under your deck... sprinkle some salt on it i.... once it is rusty enough move it to your garage...

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post #2 of 8 (permalink) Old 02-22-2008, 01:21 PM
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Quote:
Originally Posted by 2008TTCC
Leave the DPF outside under your deck... sprinkle some salt on it i.... once it is rusty enough move it to your garage...

the perfect recipe....if i left mine outside it woulda got jacked

2005 f-250, 97 cummins and zf6spd!!!!
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post #3 of 8 (permalink) Old 02-22-2008, 07:17 PM
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my stock exhaust has been sitting outside for a year and not a touch of rust,on the other hand my mbrp supposed to be stainless exhaust has rusted from the cat delete back but not the downpipe????????wtf mbrp
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post #4 of 8 (permalink) Old 02-22-2008, 08:29 PM
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Quote:
Originally Posted by Rainman
Stainless won't rust.

I'm with the ''Thebac''

Lets hear some tuned - boost, EGT ........ #####
stainless will rust...go check out every 6.0L, duramax, and Cummins exhaust. All have 409SS and some parts 439SS.

06 F250 6.0L ID tuning. RCD EGR delete 03 turbo
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post #5 of 8 (permalink) Old 02-22-2008, 10:03 PM
 
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Quote:
Originally Posted by BARRY1ME
stainless will rust...go check out every 6.0L, duramax, and Cummins exhaust. All have 409SS and some parts 439SS.
You are seeing impurities in the stainless that shows up on the surface of the material over time. T409 is much cheaper and has less nickle than 304. Even though it looks like it's rusting the rust will not penetrate or go through the wall.
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post #6 of 8 (permalink) Old 02-23-2008, 12:25 AM
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if carbon touches stainless it will rust it also! learned that the hard way using a carbon brush on a stainless weld back in the day... not good for a sanitary enviornment!
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post #7 of 8 (permalink) Old 02-23-2008, 12:19 PM
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I moved these posts into their own thread, from the "Impressive numbers" 6.4 thread.
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post #8 of 8 (permalink) Old 02-23-2008, 12:36 PM
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no offense dude but I dont know where you got your information on 409SS for exhaust systems but you are misinformed. 409SS will rust. 90% of the cars being manufactured have 409SS exhaust. Some Honda and toyotas are using 441 and 440SS. 304SS is used in some higher temp applications or tight bend radius's. Now if your talking about taking an ehxaust system and setting it outsided and seeing if it will rust....thats a completely different story. Considering your not subjecting the material to any heat cycles or heat cycles with corrosion it will last a very long time. Granted AL409 will rust about 40% quicker then 409SS. I can show several studies done by AK steel (largest tube supplier for exhaust for OE's) showing the corrosion rates and deteriation due to temperatures and the elements. The hotter the exhaust gets the quicker it will rust and deteriate. 409SS in a 1.5mm thickness will not last that long at 1400F+ temps. For gas applications 1400F is fairly low. For older diesel technology...i.e dpf less exhaust systems would never get over 1000F. These new DPF exhausts will get up 2000F. BTW the 6.4L stock exhaust is a combination of 439SS 304SS, and 409SS. FYI I design DPF's DOC's converters for a living.

06 F250 6.0L ID tuning. RCD EGR delete 03 turbo
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