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Thread: Wall Thickness For Intake

  1. #1
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    Wall Thickness For Intake

    What wall thickness would you use for building a custom aluminum intake?

  2. #2
    Supporting Member II Turbo Mopar Contributor tryingbe's Avatar
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    Re: Wall Thickness For Intake


  3. #3
    turbo addict
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    Re: Wall Thickness For Intake

    IIRC BMF tube was only 1/8", possible it could have been 3/16". I used 1/4" wall on my plenum, 3/8 or 7/16" on floor.
    Todd
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  4. #4
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: Wall Thickness For Intake

    Had a similar conversation with 22Shelby before he made his recent intake. It somewhat depends on some things

    Structure
    --round is stronger than box
    --if a box are the corners bent metal or welded seams or extruded cross section? (weld typically more prone to crack than other 2)
    --large flat areas give more leverage to boost to hurt corners

    Why do they crack?
    --Boost level comes into play for 'magnitude' of force
    --cyclical fatigue (boost->vacuum->boost) will cyclically fatigue
    --backfires, large impacts also cause fractures

    So with welded plates, 1/4" is safe, 3/16 is possible if pay good attention to design, and I'm not sure I'd go 1/8" unless it's a full extrusion?

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  5. #5
    turbo addict
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    Re: Wall Thickness For Intake

    I went with 1/4" plate on mine, box design. Held up well for 6 years or so, so far.
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  6. #6
    Supporting Member Turbo Mopar Contributor
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    Re: Wall Thickness For Intake

    Thanks for the info. See how bad I can screw this up.

  7. #7
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    Re: Wall Thickness For Intake

    Quote Originally Posted by 4 l-bodies View Post
    IIRC BMF tube was only 1/8", possible it could have been 3/16". I used 1/4" wall on my plenum, 3/8 or 7/16" on floor.
    Todd
    Yep, BMF is 1/8"

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