Is it worth it or should I remove what s left and leave it bare?

 

Would like to know this too. Currently removed the old padding and have spent 3 days removing all the glue with goo gone. What a pita...there must be an easier way? Thinking of throwing some gold foil in lieu of the crazy expensive oem padding.

 

one option

https://928motorsports.com/parts/hoodliner.php

 

I replaced mine maybe a decade ago and it's already starting to tear and break apart. Unless your car originally came with it and you are going for 100% originality for concours, etc., I'd personally just take it all out and polish/wax under the hood. It's referenced by Porsche as a sound absorber, and after driving cars with and without the pad, I've never really noticed an obvious difference in sound -- in part maybe because it's hard to find a 951 with bone stock exhaust these days?

 

The Whole Earth Catalog cheapo alternative would be Frost King heating duct insulation, adhesive-backed foam with aluminum foil facing, from Home Depot or Lowes, about $1.20 per square foot. Comes on 12" X 15' roll. Porsche purists will be aghast, but this stuff is specifically designed to stick to and thermally/acoustically insulate sheet metal, and lasts for decades in your hot attic. Also comes in 3" wide roll, which could be handy insulating turbo hard pipes, air box, etc. where you want to keep hot things hot and cool things cool.

Also works well for noise insulation under rear deck carpet, etc., at a fraction the cost of Dynomat, etc.

Purists may flame this idea all you want, but just tell us what works as well or better, for anything close to the same price and efficiency... If you don't like it, just peel it off.

 

I've seen friends cars with the FK product. It seems ok for sound and heat/cold insulation on the interior but I would have doubts using it in the engine bay due to its poor chemical resistance. I'd be concerned that oil, gas, fumes might get absorbed by the cotton-based insulation and cause a fire. Rather use a product designed for the conditions in the engine bay.

 

Replace it. I didn't, and after nearly ten years, my hood's original paint is badly cracking due to the heat from the motor.

 

^^^^^^

It also acts a thermal barrier. Keeps the hood from fading and cracking.

 

The S2's do not have it so I don't run it.

 

S2 engine bay is no where near as hot as a turbo.

 

Clearly, you don't know what product I posted about, which has no cotton or anything of the sort. Rather, it is a product specifically designed for heating duct insulation, with an adhesive-backed foam core about 1/8" thick, and aluminum foil facing, which makes it impervious to fuel, oil, etc. Seal the edges with aluminum foil tape, about $3/roll.

https://www.google.com/url?sa=t&rct=...QRGbbNvMreGG7w

 

yea the FK is grey close-cell foam with sticky backing and foil face.

i have a bunch of it in my car lining the trunk floor and door skins as a lightweight "dynamat alternative", seems to do the job ok.

for a few years i used a foil-faced jute pad as my under-hood insulation, wrapped the edges and spliced cutouts with that shiny AC ducting tape. looked great, swapped hoods after my crash in 2010 so currently running naked...

i use the same foil/jute as trans-tunnel insulation.

 

Check out:

https://www.techflex.com/land_hitemp.asp

another quality but expensive option.

 

BTW, how well does Frost King foam duct insulation work on your car as a noise and vibration reducer?

 

im sure its better than nothing, but the rest of the car is so loud its hard to pick any one thing out..