ausmini :: View topic - Factory sound proofing

I've got a 1977 car here with some kind of hard foam material stuck in place on the big panels (roof, doors). Anyone know if this is from the factory? Is it any good? Just wondering whether to rip/chip (it's gone kinda crumbly) it off, or stick something (dynamat etc) over the top. I'm guessing having something between any new dynamat and the panel would reduce it's effectiveness at damping panel vibration.

This stuff isn't foil backed, it's about 2mm thick, crumbles off rather than peels. Has holes kinda looks like those old acoustic tiles.

Author:	smac [ Thu May 02, 2013 10:08 am ]
Post subject:	Factory sound proofing - 70's cars
I've got a 1977 car here with some kind of hard foam material stuck in place on the big panels (roof, doors). Anyone know if this is from the factory? Is it any good? Just wondering whether to rip/chip (it's gone kinda crumbly) it off, or stick something (dynamat etc) over the top. I'm guessing having something between any new dynamat and the panel would reduce it's effectiveness at damping panel vibration. This stuff isn't foil backed, it's about 2mm thick, crumbles off rather than peels. Has holes kinda looks like those old acoustic tiles.

Author:	tomtom [ Thu May 02, 2013 10:25 am ]
Post subject:	Re: Factory sound proofing - 70's cars
smac wrote: I've got a 1977 car here with some kind of hard foam material stuck in place on the big panels (roof, doors). Anyone know if this is from the factory? Is it any good? Just wondering whether to rip/chip (it's gone kinda crumbly) it off, or stick something (dynamat etc) over the top. I'm guessing having something between any new dynamat and the panel would reduce it's effectiveness at damping panel vibration. This stuff isn't foil backed, it's about 2mm thick, crumbles off rather than peels. Has holes kinda looks like those old acoustic tiles. Factory was brown matting I believe, kinda looked like hay, short strands of this stuff all webbed together and stuck on, PITA to take off. i'd say yours isn't factory, but not certain. People have had success freezing the stuff and then chipping it off, as it's usually made from tar or something like tar. I think dynamat over the top will be less 'successful' and I'd try and get the stuff off. Supercrap sell a spray that smells of orange, and it actually has citrus extract in it and it works really good at removing adhesives, I used it on my roof and we use it at work to get sticky stuff off computer screens and stuff. Not sure how it would go on this stuff though, but could be worth a thought.

Author:	Harley [ Thu May 02, 2013 10:29 am ]
Post subject:
His car is factory, cause its a UK car. You can dynamat over it of you want - the job of the dynamat is to add mass to the panel to change its resonant frequency, small gaps won't matter, though since it already has the sound deadener on it you may not notice much difference.

Author:	tomtom [ Thu May 02, 2013 10:40 am ]
Post subject:
Harley wrote: His car is factory, cause its a UK car. Ah, didn't read Een Zeed.

Author:	smac [ Thu May 02, 2013 10:42 am ]
Post subject:
Well, it'll be NZ assembled from a UK kit, but yeah I realise it may not be the same under the carpet as what you guys had. Thought maybe it might have been common across the various sources though.

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Factory sound proofing - 70's cars https://www.ausmini.com/forums/viewtopic.php?f=2&t=81323	Page 1 of 1

Author:	Harley [ Thu May 02, 2013 10:50 am ]
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The UK cars went through a few soundproofinng stages, a simple one in the 70 (what you have) and a more heavy duty version in the mid 80s that went right through to the end. The later cars had thin rubber/bitumen 'tiles' full of holes on the rear quarters and doors, the front floors had a thicker (3-4mm) solid layer all the way across and the firewall had a 3/4in thick sponge and rubber layer on it - which just makes a mess if you want to remove it. The thick soundproofing on the floor makes them a little less susceptible to rust, but when it happens its a nightmare to fix.

Author:	66S [ Thu May 02, 2013 1:52 pm ]
Post subject:
Is this stuff black? Our GT had such mnaterial and I have seen small sheets of it at a local paint supply outfit. Al

Author:	smac [ Thu May 02, 2013 5:28 pm ]
Post subject:
66S wrote: Is this stuff black? Our GT had such mnaterial and I have seen small sheets of it at a local paint supply outfit. Al Yeah I think so, lot of paint overspray on it though (car has been repainted) so a little hard to tell. Think I'll have a crack at getting it off.

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