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Firewall foam details

Discussion in 'Technical Q&A' started by jselevan, Nov 1, 2005.

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  1. jselevan

    jselevan Formula 3

    Nov 2, 2003
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    #1 jselevan, Nov 1, 2005
    I am in the process of a rotisserie restoration of one of my Dino's. After blasting, prime-ing, etc., etc., I now have to replace the foam that lies between the passenger rear (fiberglass) tub and the engine compartment.

    The old stuff reminds me of the stiff foam that one use to stick artificial flower stems into. I am looking for a closed-cell foam that provides primarily sound insulation. It must be 1 1/4 inch thick. I will add the same foam to the space between the fiberglass floor and the bottom pan.

    Has anyone chosen a foam for this purpose? Material? Hardness? Thickness? Where to purchase?

    Thanks for your help.

    Jim S.
     
  2. davem

    davem F1 World Champ
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    dave m
    #2 davem, Nov 1, 2005
  3. jselevan

    jselevan Formula 3

    Nov 2, 2003
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    #3 jselevan, Nov 1, 2005
    Last edited by a moderator: Sep 7, 2017
    Dave - thanks for the reply.

    I am quite familiar with Dynamat, and have purchased large quantities of the stuff from a Web site that offers 50% discount!

    My post refers to the foam that sits between the fiberglass panels behind the driver. You are likely not familiar with this foam, as it is only visible when the entire tub is exposed, as when removing EVERY SINGLE ITEM from the Dino. It is approximately 1 1/4 inches thick. I will be using the Dynamat in addition (on the passenger side).

    But this foam fills the space occupied by the tubular frame of the Dino.

    These pictures may help.

    Thanks. Jim S.
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  4. mk e

    mk e F1 World Champ

    Oct 31, 2003
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    Help me get this thing finished! https://gofund.me/39def36c
    #4 mk e, Nov 1, 2005
    foam board with foil facing is available at home depot in 1" or 1 3/8", but tends to run thin so 1 1/4" is probably what you'll find.
    fiberglass supply places othern carry uraethane foam board in many thincknesses.
     
  5. JCR

    JCR F1 World Champ
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    #5 JCR, Nov 1, 2005
    Try this place. http://www.soundproofing.org/
    Here is one of the product descriptions:

    "Super Sound-Proofing Acoustical Mat! A sound control barrier as well as an absorber, it's a closed cell foam, it won't absorb moisture. Available in rolls and by the foot, the material works as well in boats, cars, home, office as in planes! 1/8" to 2" thick. Sold by the running foot, 48" wide. UL, Fire Resistant, FAA Approved! One side is smooth, apply with contact cement! (Or use the peel-off backing)."

    If this doesn't work out, at least try to find materials used in industrial or aerospace applications. The durability would probably be better most likely better than home-improvement materials.

    BTW, how difficult was it to remove the front and rear windows? Is the window rubber available NOS or repro? Or will you reuse the originals?
     
  6. racerboy9

    racerboy9 F1 Rookie
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    Nov 3, 2003
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    #6 racerboy9, Nov 1, 2005
    Try McMaster-Carr in Atlanta. They have an online catalog @ http://www.mcmaster.com/ They have a 1.25" thick neoprene/epdm/sbr foam rubber with a temp range of -70 to +200 degrees. Type in foam insulation in the search window or go to page 3286. There is also a fire retardant silicone foam rubber good to +450 degrees but the price is up there. This is not a stiff foam like the original but the neoprene type worked well for me and I used it under the floor pan in place of the fiberglass insulation the factory used.
     
  7. jselevan

    jselevan Formula 3

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    #7 jselevan, Nov 1, 2005
    Racerboy - thanks for the tips. I have been scanning McMaster-Carr all day, only to walk away more confused. You have guided me in the right direction. I will focus on your suggestions.

    JCR - removing the front and rear windscreens is rather easy, assuming that you do not mind destroying the rubber seal. I used a razor blade to carefully slice along the seal to allow the glass to simply lift out. The rear window came out without difficulty. Yes, the seals are available. I will have a professional reinsert the glass when ready. I will check out the soundproofing site that you listed - thanks for the help.

    Jim S.
     

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