Foam behind rear shock tower replacement source?

[Brown747]

Doing a cleanup in the back while the engine is out. The foam seal that fills the void between the shock towers and the firewall is all deteriorated. What is being used these days and a source please.

Thanks, Thor

[rwest]

Thor,

Pelican sells it: they call it "engine compartment sound mat" there is a few different types, just do a search on the parts section.

-Rutager

[Bob Kontak]

Originally Posted by rwest

Pelican sells it: they call it "engine compartment sound mat"

Nah - not what he is looking for. He needs the foam brick wedged way down there.

I'll find it - Gimme a few.

[Bob Kontak]

Parts PDF calls it a "Strap"

Here is the same part number that PP sells.

Pelican Parts - Product Information: 911-504-930-00-OEM

[Jerome74911S]

Maybe our host sells it, but I used something else. I bought a dense, black foam rubber pad that is made for the reduction of noise and vibration caused by window-mounted air conditioners. The air conditioner sits on top of this one-inch thick material, which can be purchased in any hardware store.

I figured that the idea of the original material in the car was to cut air intrusion and to reduce noise, so the identical looking rubber slab I bought should do the job, too.

Just cut the pad to fit, using two layers as necessary. Mine has stayed in place perfectly with just a friction fit.

[Brown747]

Thanks for the answers! Thor

[Bob Kontak]

If it is not gonna be concours - I like Jeromes idea.

[schumicat]

are 2 different things being discussed here? don't the blocks shown on the PP link install from under the car? and the OP posted photos which seem to be something that goes in the engine bay (like below the engine pad?) In previous threads I read the purpose of the blocks was to block heat.

[Brown747]

The picture is what the blocks in the link look like after 33 years. Pelican Parts - Product Information: 911-504-930-00-OEM

[stevie 77 930]

As discussed the foam pad in the engine compartment and the foam blocks are different. The blocks are installed from underneath the car. The factory "straps" have an addhesive strip 0n one side that faces the shock cross member. The engine capartment pad is glued in and fits in the same cavity, just from above.

I replaced my engine pad and foam "straps" when i had the motor our for a rebuild. I ordered the foam blocks from Pelican.

[schumicat]

Thor, I guess what is confusing me is that you posted photos of the engine bay, which I took to mean that's where you found the disintegrated foam. The blocks install from underneath the car, not in the engine bay. Stevie, that is a clean engine bay.

[Bob Kontak]

Originally Posted by schumicat

The blocks install from underneath the car, not in the engine bay.

The engine bay is where Thor found the disintegrated foam. Those are the straps/bricks. They can be accessed("touched") from the engine bay. Reach into a back corner and you can get to yours.

[DRACO A5OG]

I placed 7/8" ID Plumber's Insulation Foam, cut to about 10 inches and jammed it up there. Left a 6" gap as per OEM but my sound pad took up the gap

Checked it on my second engine drop and it was in place, nice and tight.

$5.99 at ACE. It will fail Concours, oh well

[88911coupe]

I'm about to replace the sound pad AND the "blocks". It seems like the blocks, along with the bottom of the sound pad, are designed to seal the gap at the front of the engine bay. I'm assuming Porsche has some reason for this but not sure what it is. Maybe it has some effect on engine cooling by not pulling hot air from around the engine and exhaust into the engine bay?

[Mark Salvetti]

Originally Posted by 88911coupe

I'm about to replace the sound pad AND the "blocks". It seems like the blocks, along with the bottom of the sound pad, are designed to seal the gap at the front of the engine bay. I'm assuming Porsche has some reason for this but not sure what it is. Maybe it has some effect on engine cooling by not pulling hot air from around the engine and exhaust into the engine bay?

Yes, I think it is to keep hot air beneath the engine from getting into the engine bay. See this old thread (even older than this one): Hot engine bay-

Mark

[nospiners]

I used HVAC insulation foam on the same spot while i was refurbishing the heat valves. i cant tell the
difference from before , but if the factory did it , they had to have a reason