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  1. #1

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    .049 wall thickness thick enough for exhaust?

    hey guys "im gonna be making a custom mid pipe for my header. i am thinking of using 304ss 2.75" O.D. and 3.0" O.D. both with wall thickness of .049

    is that thick enough? other option is .065 but if i do that i would think i would have to drop down to 2.5 on the inner pipe.


  2. #2

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    Cool

    you in saltwater? .049 should be fine -FLUSH!!

    later cd

  3. #3

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    yes im in heavy salt water

  4. #4
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    .049" tubing on the exhaust

    I would use nothing less than 14 gauge wall... personally.

  5. #5
    home of the dislexic fingers breon's Avatar
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    you can make it out of .49 but you will have trouble welding it.. needs zero gaps and you need to be a good tig welder..it can be done... but why fight it..just get the .065...that is what all the headders i make are ..the tubes i just got for my ski headder i just got .065

    making these right now..for a 69 baracuda



    my current mid pipe


  6. #6
    rick xp's Avatar
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    +1 all my turbo manifolds have been 1.6mm = 0.065" and using 2.5" on the inside with 3" outer.

  7. #7

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    ok i will go with the .065 i have a miller syngrowave in my shed . what size bungs should i use for the water inlets and outlets?

  8. #8
    rick xp's Avatar
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    I have always used -8 or 1/2" lines.

  9. #9

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    you weld with 0 gap? you don't space your tubes like 1/8 or 45 degree grind them? i usually just grind them on 45 degrees and butt them together. should i back flow it with argon? i usually don't back flow but then again i haven't done many exhausts.

  10. #10
    rick xp's Avatar
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    Nah mate i just make sure there is no gaps.

    Its only 1.6mm thick so you dont need like a bevel edge on it as it welds very easily.

    Its not like welding steam pipe.

    Just try and make sure there is no gaps.

    Also i havent tried back filling with argon but if there is no gaps this also helps quite a bit.

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