Offshoreonly.com - Tail Pipe Modifications

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ezrizer

10-05-2018 06:34 AM

Tail Pipe Modifications - What Grade of Stainless?

I need to modify my existing tail pipes and would like input on material. Obviously stainless steel, 316L is more corrosion resistant 304 (18-8), is there much difference / benefit between the two in this application? is there an alternative grade that should be considered? This will be a completely dry set up. that will consist of half of the original pipe and the other half will be new material.

Also will welded seem tubing work?

Rookie

10-10-2018 06:03 PM

I used this for 12" extension for my CMI E-Tops. My exhaust is wet though.
https://www.ebay.com/itm/4-102mm-16-...skYt:rk:1:pf:0

Camalot

10-11-2018 07:05 PM

Good question, this is my take on it and what I have experienced first hand. 316 will give you the best all around resistance to corrosion no arguing with that.
Ive been making my own tubular risers for around 5 year now with different cams and using anti reversion chambers to eliminate reversion.
As these riser where for test only I used 304 as it was cheaper, over the last five years I have used the same riser on one engine which has had salt water runs but lives in a brackish water lake. I had a look inside the water jacket this year and they are discoloured but NOT corroded at all. The outside of the riser look as good as the day I made them.

ezrizer

10-13-2018 05:49 AM

Thanks for the replies. CMI says there headers are 316L but tail pipes are 304L. We didn’t discuss seamless or not. 304L in 4” is pretty easy to find, 4-1/2” is harder to find.

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