original firewall insulation, Soundproofing only, or fire retardant too? |
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original firewall insulation, Soundproofing only, or fire retardant too? |
flipb |
Sep 21 2009, 08:21 PM
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#1
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Senior Member Group: Members Posts: 1,722 Joined: 2-September 09 From: Fairfax, VA Member No.: 10,752 Region Association: MidAtlantic Region |
Tried searching but couldn't find a definitive answer:
The original rubber insulation on the engine side of the firewall... is that just soundproofing? Or does it serve as a fire barrier as well, as you find lining the hood of many modern cars? On my '74, it's torn and falling off. I'm going to tear it out but just curious whether I should think of it as a piece of safety equipment, or just something to make my wife complain less about the noise... the glorious noise. |
ClayPerrine |
Sep 21 2009, 08:52 PM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,469 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
Tried searching but couldn't find a definitive answer: The original rubber insulation on the engine side of the firewall... is that just soundproofing? Or does it serve as a fire barrier as well, as you find lining the hood of many modern cars? On my '74, it's torn and falling off. I'm going to tear it out but just curious whether I should think of it as a piece of safety equipment, or just something to make my wife complain less about the noise... the glorious noise. Please... for the long term sake of your car, remove it and don't put it back. The insulation was rubber backed, shredded asbestos. It retains water, and makes the firewall rust. So put something like dynamat extreme on the inside behind the back pad. Your car will thank you in the long run. |
McMark |
Sep 22 2009, 12:03 AM
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#3
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
(IMG:style_emoticons/default/agree.gif)
It's a great fire retardant when it's completely saturated with water. |
Rod |
Sep 22 2009, 03:39 AM
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#4
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Senior Member Group: Members Posts: 616 Joined: 1-January 08 From: Farnham UK Member No.: 8,526 Region Association: England |
Use dynamat (or Damplifier,) then second skin spectrum, this can then be sprayed over to match bodycolour. Looks pretty factory too (in a dimpled way (IMG:style_emoticons/default/smile.gif) )
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charliew |
Sep 22 2009, 08:28 AM
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#5
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Advanced Member Group: Members Posts: 2,363 Joined: 31-July 07 From: Crawford, TX. Member No.: 7,958 |
I like Rods idea, now if I can just remember it.
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veltror |
Sep 25 2009, 10:28 AM
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#6
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Senior Member Group: Members Posts: 928 Joined: 27-April 08 From: Potters Bar Herts UK Member No.: 8,978 Region Association: None |
Use dynamat (or Damplifier,) then second skin spectrum, this can then be sprayed over to match bodycolour. Looks pretty factory too (in a dimpled way (IMG:style_emoticons/default/smile.gif) ) Can you be a bit more specific dyanmat I have heard of but what the hell is second skin spectrum... etc? (IMG:style_emoticons/default/dry.gif) |
mtndawg |
Sep 25 2009, 06:40 PM
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#7
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Member Group: Members Posts: 414 Joined: 26-January 09 From: Granite Bay, Ca Member No.: 9,985 Region Association: None |
I took mine out and I'm replacing with Fat Mat. That looks like a good one too.
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rhodyguy |
Sep 25 2009, 08:16 PM
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#8
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,080 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
the acid vapors are retained nicely along with the water. you may find a surprise in the lower right side corner upon removal. i hope not.
cleaning the firewall and painting to match the car is a popular option. it looks really clean. you can dynamat the interior side at a later date if you find engine noise is a problem. k |
type47 |
Sep 26 2009, 07:04 AM
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#9
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
The insulation was rubber backed, shredded asbestos. It retains water, and makes the firewall rust. So put something like dynamat extreme on the inside behind the back pad. Your car will thank you in the long run. I'd like more information on updating the engine compartment back pad to something more efficient/modern. Sources? Pics? I have a car that could use an update. |
Jacob |
Sep 26 2009, 08:20 AM
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#10
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Member Group: Members Posts: 131 Joined: 12-February 08 From: Mansfield, Oh Member No.: 8,705 Region Association: Upper MidWest |
I did a search for Auto sound deadening products and came up with a lot of responses.
Sound deadening mats: Dynamat. They seem to be the yardstick everybody else uses to rate their product. http://www.dynamat.com/ Second Skin. http://www.secondskinaudio.com/products/So...CFeRL5Qod4Vck2A Fat Mat. http://www.fatmat.com/ B-Quiet. http://www.b-quiet.com/?ovrtr A generic Soundproofing site http://www.soundprooffoam.com/soundproofin...WID=41147297022 Sound deadening paints: (also see Second Skin) Lizard skin available at Eastwood and Jeg's Article about installing http://kitcar.automotive.com/81031/0803kc-...ster/index.html There seem to be two main types of products. sound deadeners that cut the vibration of metal panels and sound absorbers that cut down airborne sounds. I have not used nor do I endorse any of these products. Maybe some people who have used any of these can add their comments. |
Gint |
Sep 26 2009, 08:22 AM
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#11
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Mike Ginter Group: Admin Posts: 16,075 Joined: 26-December 02 From: Denver CO. Member No.: 20 Region Association: Rocky Mountains |
The last thread recently listed another product also. Raamat or some such thing.
Here's a link: http://www.914world.com/bbs2/index.php?showtopic=86906& |
jim912928 |
Sep 26 2009, 09:45 AM
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#12
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Senior Member Group: Members Posts: 1,485 Joined: 8-January 04 From: Granger, IN Member No.: 1,536 Region Association: Upper MidWest |
I've purchased interior stuff from this guy...door panels etc. I noticed on ebay he sells replacement firewall pads for 911's, 914's etc. Stuff I have gotten from him in the past has been a perfect fit everytime. I haven't gotten this item yet but was contemplating it before I put my engine back in. He goes by appbiz.
http://cgi.ebay.com/ebaymotors/ws/eBayISAP...RK%3AMEWAX%3AIT Has anybody tried this item yet? |
Rod |
Sep 26 2009, 11:29 AM
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#13
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Senior Member Group: Members Posts: 616 Joined: 1-January 08 From: Farnham UK Member No.: 8,526 Region Association: England |
Use dynamat (or Damplifier,) then second skin spectrum, this can then be sprayed over to match bodycolour. Looks pretty factory too (in a dimpled way (IMG:style_emoticons/default/smile.gif) ) Can you be a bit more specific dyanmat I have heard of but what the hell is second skin spectrum... etc? (IMG:style_emoticons/default/dry.gif) No problem. Ok, damplifier is a soundeadening mat, which is very similar to dynamat. it is metal backed and should really be rollered into place. this matting is great, but does not look very '914' So the next trick is to add 'spectrum' on top...It is a thin paste which can be sprayed, rollered or painted onto any metal surface.It was designed as a vibration/panel damper, but it also contains anti rusting compounds, so is ideal for painting on inner surfaces. It can be painted straight over the matting, and ideally in a 2-3mm layer.. A thickening agent can be added to it to really thicken it up into a goo - but this is best left to the car audio guys.. Here is an image of damplifier covered in a layer of raw Spectrum. in this image it has dried to a grey, later (current) batches have a black dye in, which imo looks better. It can be sprayed or painted easily in a colour of your choice. (IMG:http://i356.photobucket.com/albums/oo4/oldbug1957/DSC_0010-4.jpg) So there you go, I have used this in the past to great effect, and when I rip out my 1.7 and replace with a 2270, thats what i'll be doing to my engine bay (IMG:style_emoticons/default/wink.gif) |
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