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Thread: Firewall material?

  1. #1

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    Firewall material?

    I have tried the search and can't find any information on what to use for firewall material. Don't need anything exotic just the normal stock material and gage. This is an experimental so I can use what is best. Thanks for your help. Duane Woolsey
    N65WA

  2. #2
    Iflylower's Avatar
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    Use stainless steel, aluminum melts too easy. It IS a FIREwall. Some are using titanium to save weight. Bigger $$$.

    Reference #12365 print for your dimensions if Lycoming model.

    Buy 3'x3' of
    301 SS 1/2 Hard 36 .016 2.016 03-31200 03-31200

    from www.aircraftspruce.com

    36" width, order 3' of it. .016 thick, 2.106#'s per lineal foot, part number 03-31200, should be $49 for stock that I just plugged in.

    Good luck.

  3. #3
    Iflylower's Avatar
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    Or search Clyde Smith and buy his SS cub firewall ready to go.

  4. #4

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    Thanks for the advice. I have just finished stripping the paint off of the one that I have and may use it again but at least now I know what to use if I do replace.
    N65WA

  5. #5

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    Firewalls

    You can also use 304 stainless, also available from Aircraft Spruce. The 304 is a bit softer and easier to work with than 301 1/2H.

    As for titanium you should look for a piece of .016 comm'l pure titanium for a first choice. 6AL-4V also works but it is much harder to work with. TitaniumJoe.com has scrap titanium for sale. A piece big enough for a firewall should run about $200. For those who don't want to do any fabrication F. Atlee Dodge makes a titanium firewall that is a direct replacement for a PA-18 firewall, but it costs quite a bit more than $200. A titanium firewall will save you about 2 pounds compared to stainless steel.

    Dave Prizio
    Dave Prizio
    TX Sport Cub N114DE

  6. #6

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    I found a 3'x3' piece of 6al-4v .016 Ti on E-Bay for $80.00 plus shipping.

  7. #7
    Binty's Avatar
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    Is .016 the correct gauge? It seems awfully light...? Do the after market SS and Ti Firewalls have the vertical beads in them?

  8. #8
    Steve Pierce's Avatar
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    Quote Originally Posted by Binty View Post
    Is .016 the correct gauge? It seems awfully light...? Do the after market SS and Ti Firewalls have the vertical beads in them?
    That is what thickness is needed for proper fire rating. The titanium firewalls I have seen do not have the beads.
    Steve Pierce

    "When everything seems to be going against you, remember that the airplane takes off against the wind, not with it."
    Henry Ford

  9. #9
    Binty's Avatar
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    I have the ability to roll beads in the new firewall material identical to orig. It is worth doing?

  10. #10

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    I have not tried beading the 6al-4v Ti yet. It is very tough and requires a large bend radius for bending (10t I believe) so I would like to hear how you make out if you give it a try.

  11. #11
    Binty's Avatar
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    Quote Originally Posted by aviweld View Post
    I have not tried beading the 6al-4v Ti yet. It is very tough and requires a large bend radius for bending (10t I believe) so I would like to hear how you make out if you give it a try.
    I will be using the Stainless if I do.

  12. #12
    skywagon8a's Avatar
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    The beads will provide a little extra stiffness to the whole firewall/wraparound cowl assembly.
    N1PA

  13. #13
    Olibuilt's Avatar
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    I tried to do beads on titanium leftover. I didn't work for me. The titanium cracked.

    But tinanium .016'' 6al-4v firewall was pretty easy to work with. Drilled and cut with regular tools.

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