floor pan insulation

[maxwedge528]

just bought a 72 911T...and need to replace some of the interior floor pan insulation. after searching i have not come up with an answer. can someone advise the material and the source. thanks

[JohnT]

This is what was used in the early cars. I don't knonw when they stopped installing it, sorry. All this stuff does is hold the water that leaks in past the hardened window seals. It keeps the water in close contact with the floors and the rear seat bottoms so as to maximize the rust damage.

One popular replacement is POR 15 and then Dynamat. Getting rid of the original crap and then the rust is not a job for the faint hearted.

good luck

johnt

[ajwans]

What is the procedure for removing this stuff? Is there a good test for
rust or a particular spot to check without removing it all? I see no reason
to remove it if there's no rust to date.

andy

[j911brick]

I'm not sure if its the same as your '67, but the '71 I just restored, and my '79, the tar mat came up pretty easy with a (good) putty knife and heat gun. It only takes about an hour so with you get at it. Dynamat is the only thing I know of that comes close, and of course its not right.

[maxwedge528]

thanks for the input. the insulation material was cracked and coming apart. and yes, it would certainly do a goof job of holding the water against any metal. i removed with a putty knive and there were some spots with surface rust. i cleaned thoroughly per por 15 instructions and coated with por 15 i will look for some dynamat this morning.

[JPlonghood]

Look on the AutoAtlanta web site. They sell some products from Worths (Scottish company). It goes down easy and can be painted once installed. Here are a few photos of a car I recently used the product on. The first photos are of the floorboards w/ POR 15.

[sithot]

Don't see it on the website or the PDF files. Do you use a "roller" like Dynamat or BQuiet's "Brown Bread"? This stuff is the solution if you own a noisy diesel truck.

Here's a link:

http://www.hometheaterhifi.com/volum...ng-6-2003.html

Tom

[sithot]

Don't see it on the website or the PDF files. Do you use a "roller" like Dynamat or BQuiet's "Brown Bread"? This stuff is the solution if you own a noisy diesel truck. A lot has changed since it was first introduced and there are a couple of new products that look promising.

Here's a few links:

http://www.hometheaterhifi.com/volum...ng-6-2003.html

http://forum.eastwoodco.com/showthread.php?t=1250

http://www.icixsound.com/vb/showthread.php?t=39505

http://www.b-quiet.com/911.html


Tom

[911pcars]

I'm guessing the original "horsehair" mat isn't too popular even though it's period-correct for all the reasons stated thus far. Any replacement in this area always requires clean base metal, then applying suitable rust preventative. I think that's more important than the type of insulation that goes on top of it.

That said, I used a Dynamat-like material from JC Whitney. It's an asphalt based, rubber-like material with pressure-sensitive adhesive on one side. However, it's about 1/3 the price of Dynamat. Liquid coatings like BQuiet would work well too and probably result in less weight. Because of the weight penalty, I wouldn't go wild with the JCW stuff. I also used pieces of this material on flat areas of the door and inner fenders in the trunk to help reduce noise and vibrations. I wouldn't do it if it was a track car though.

http://www.jcwhitney.com/autoparts/P...ulation+sheeet

INSULATING SHEETING
"Asphalt-based 1/16" thick black sheeting trims easily to conform to panel contours. Reduces resonant vibration and sound distortion in body panels around speaker installations. Effectively decreases loudness and duration of road, engine sounds. Self-stick backing adheres instantly to body panel, floor pan, firewall—any sheet metal. Covering as little as 10% of a sheet metal panel can significantly dampen sound. Instructions included. 2 sizes: 32" x 54"; 10" x 13", ideal in tight areas (around speakers or power window motors in door or rear side panels)."

Two 32x54 pieces will cover the entire floor pan on each side of the tunnel. I added a bead of silicon caulking to seal the edges and prevent moisture from migrating underneath.

Uh.... no affiliation with JCW.
Sherwood

[sithot]

Here is the part. Supposed to be painted in a 914 and left plain in a 911 according to "AA" parts folks.

http://www.autoatlanta.com/

"WURTH"

BWU890100

Now go have some fun.

Tom