What is a good substitute for sound padding in engine bay?

[movin]

My '87's sound padding is sagging and in need of replacement. What's out there that works, stays put, and looks good? Do I have to remove the old glue before installing new or can I add new adhesive over the old? Thought I saw someone using a foam pad with a foil surface, kinda like HVAC insulation, does that work in the hot engine bay environment?

[flipper]

I was thinking a soundproof undercoating, but that might be frowned upon

[Bill Verburg]

AppBiz has a foil type, also available from our host, I think

or Dynamat like this

[ricochet]

I see often on ebay sound deadening pad that "says to be much improved", but I cannot prove this is true. I'd think Porsche would offer pretty good stuff and they have experience.
As far as removing the old adhesive, I would get what I could get off. Hopefully someone will offer info on what would make this easier.
A buddy of mine is wrapping the standard OEM pad with welding blanket, he believes this is "one better than oem"
Check ebay for the listings I mentioned. May be good stuff, may not. Has not had years to prove as better, yet.

[ricochet]

and I forgot to mention dynamat (used for high end stereo systems), dunno about heat resistance (in what I used).

[FrayAdjacent911]

I think once I get the back deck cleaned up and repaired if needed, I will probably try some dynamat or something... likely on the inside of the cabin.

[emcon5]

I replaced my factory pad when I had my engine out to do the clutch. The net change, my car was heavier and my wallet was lighter. I didn't notice any difference in sound.

The next time I pulled the engine, I removed it completely. My car is galvinized, and that area is painted, so I just left it alone. My car is black, so the glue residue doesn't really show unless you are looking for it, not that it bothers me anyway, hell I haven't washed it in ~7 months. It is for driving, not for lookin' at.

RE: Undercoating, I would find out what the temp range is before I put it in my engine compartment. The stuff I have used in the past is rubber.

Tom

[Jack Olsen]

I have the Appbiz pad. Pelican sells it.

[ianc]

The answer is leave it off altogether. You'll have more room if you have to give the cold start valve a reacharound, the car will be lighter, and you'll hear that sweet song better in the cockpit.

ianc

[911pcars]

I have the JCW pad. JCWhitney's sells it. However, you have to cut to shape. Lighter and less expensive than Dynamat, but it's just foam and Mylar.

Sherwood

[Chuck Moreland]

The pad does a little for sound, but more for reducing heat entering the cabin. The appbiz peice is much lighter than stock, and the foil face probably provides an even better heat barrier.

[Porschekid962]

I agree with Chuck and can tell you that it really helps reduce heat as well. Before my dads car was painted or the interior went in I drove it around with no interior at all, just one seat. Then we took out the factory sound/heat pad and it was a little noiser but not bad. We then put in the appbiz pad and things were much cooler in the cabin. No carpet or package tray to trap heat, just metal and the appbiz pad helped so much that you could actually touch the metal without it being extremely hot to the touch. Now the rear package tray is in with the same material on the backside of it and things are very liveable in the cockpit but you can still hear what is going on behind you.

[Jack Olsen]

The heat barrier is especially important for a 72, since there's additional heat coming from the forward oil tank.

[movin]

So does the Appbiz pad have an adhesive side or do I have to apply adhesive?

[Todd Simpson]

The Appbiz pad needs adhesive.

Agreed you definitely need something to insulate you from the heat.

[JP911]

Another vote for the Appbiz pad! I put one in my car about a year ago and it really cleans up the engine compartment and keeps things cool in the cabin.

[jtratza]

What is the part number or where do I find it on PP. I did several searches but can't come up with the pad. The original pad came out years ago and would like something to keep the heat out of the cabin. Thanks all in advance from Mr. Blind

[gumba]

I used a product called "quiet coat" (quietcoat.com) It's used as a sound barrier for stereo installations. Can be brushed, rolled on or sprayed, and water soluable. Suppose to have better dampening than dynamat. Can be used on the interior or exterior. You could use that for the sound barrier then glue a heat shield pad on top of it. I used it on the interior of my crewcab, then installed carpet on top. It says it can be used in engine compartments.

[JP911]

http://www.pelicanparts.com/catalog/shopcart/911M/POR_911M_miscel_pg10.htm#item48

Or, part number: PEL-APBZ-ESPU

[jtratza]

Thanks JP.