Interior Basket Case

383scuda

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My 1978 Aspen Super Coupe is back on my project list. Problem is an old employee took the dash completely out to weld up a rust hole. That was 20 years ago. Problem is, I have to reassemble it. I have a parts manual now and a service manual on the way. Todays question: Did they put an insulation board of any type on the firewall inside the cabin? I would think so, but I can not find one.
 

Cordoba1

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I actually have no idea. I suspect it would be neigh impossible to find one. That being said, if I were that deep in a project, I'd take the opportunity to cover any bare metal on the interior firewall with Dynamat or similar acoustic deadening material. Putting it under carpets, in the doors, and/or in the trunk seriously quiets these old rides down. For not a lot of money, you can give an old car that "bank vault" feeling by deadening all those 2nd and 3rd order resonances.
 

Aspen500

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I can't recall if there's something on the firewall off hand (I'm sure there would have been something), but there is a thin jute-like insulator on the underside of the cowl, that wraps up towards the windshield. When building my Aspen, I lined the firewall, cowl and floors with Eastwood's version of DynaMat. On the underside of the roof, I used foil faced "Hot Rod Insulation from Speedway Motor's.

Like Cordoba1 said, to find original insulation in useable condition would be about impossible.

pic6.jpg
 

383scuda

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E-Bay has Under Dash insulation and firewall sound deadener insulation pad by Collectors Auto Supply. No picture. Wondering if this is what I need.
 
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383scuda

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I can't recall if there's something on the firewall off hand (I'm sure there would have been something), but there is a thin jute-like insulator on the underside of the cowl, that wraps up towards the windshield. When building my Aspen, I lined the firewall, cowl and floors with Eastwood's version of DynaMat. On the underside of the roof, I used foil faced "Hot Rod Insulation from Speedway Motor's.

Like Cordoba1 said, to find original insulation in useable condition would be about impossible.

View attachment 45802
Nice job on the Dynamat! After looking at several photos on this site, it looks like there two pieces of sound deadner/insulation. One piece goes along the lower portion and one goes below the cowl. Jute material with vinyl outer layer. held on by screws and spray adhesive. I love Dynamat, just wanting to stay original as possible.
 

Aspen500

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Collectors lists a pre-cut insulation pad on their web site and shows a generic picture (just a big square, not the actual part) of the material but it doesn't say specifically what it's for. Suppose you'd need to call and ask.

You could buy a roll of the material and cut your own also. Something like this:
insulation | Speedway Motors, The Racing and Rodding Specialists

Seems they used to have it unfaced also when I built my car, but don't see it now.
 

DCAspen

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There should be one for AC and one for non-AC, I have never heard or seen a repo firewall pad for F+M Bodies.With no pictures of it I would be a little leary of spending your hard earned money on it.
 

DCAspen

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I'd like to know where you got it so I can get one.
 

383scuda

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PLY-FWP-110 is Collectors part number for Volare; DOD-FWP-100 is for Aspen. Two different part numbers, two different prices. Odd. Has anyone seen one? These are firewall pads.
 

BudW

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There would not be a difference between Dodge or Plymouth (or Chrysler, as far as that goes) BUT it does make a difference between years and A/C vs. no-A/C.

All F/M-body A/C cars have a break between '76-79 and FMJ '80 to '89. The Firewalls are different as well as the angle of the A/C expansion valve (the '76-79 A/C cars, the expansion valve sits sorta straight across where as the newer expansion valves sit at a steep angle.

A '76-79 A/C firewall
100_1271 m.jpg

Also notice the duct that connects the blower housing to the heater/evap case.

'80-89 A/C firewall
20200501_132212 m.jpg

There is no duct extending into engine compartment (photo kinda cut that off, though). Also the heater hoses are side-by-side instead of top/bottom.

The the non-A/C firewalls were the same from '76 to '80 and maybe later. Not enough '81 and newer no-A/C cars in my parts to look at.

I can see three different firewall pads:
'76-79 FM A/C
'80-89 FMJ A/C
'76-80 FMJ no-A/C (and maybe later)
I'm not sure about the newer no-A/C cars - so maybe a forth design.

BudW
 
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