[Fish Chris]

My buddy / mechanic has some sound deadener that he got from some online auto parts place, and he had offered it to me (for free). Sorry, I don't remember the brand. But its in 1 sq ft self adhesive squares, and aluminum backed.

Now although I'm pretty much a sound deadener dummy, I "Do at least know" that you don't want to use anything with asphalt in it. So the first thing I looked for on the package, was "ingrediants"...... but it didn't say (I guess they don't have to tell you what's in it, if it's not a food or drug). Well, keeping it a secret would mean to me > asphalt.

However, one of the uses it showed on the package was over the top of the motor / under the hood ? It seems to me, that if it were asphalt, it would possibly 1) melt on a hot day, over a hot motor, and 2) it would be flammable...... No ?

Anyway, its only like 9 sq ft.... so I definately need a bunch more, and the stuff I pay for will be butyl. But how do I find if this stuff my buddy has, is asphalt based ???

I'll try to get the name.... but I'm sure it's an off brand. As long as it's not asphalt, I don't think it could hurt anything, even if it didn't help quite as much as Damplifier or something expensive.

Your thoughts ?
Fish

PS, A completely different deadener question here..... But since somebody was calling me a post whore recently {wait.... they just said I sure posted a lot.... I called myself a 'post whore' LOL

Obviously one of the BIG reasons people deaden their vehicles is to reduce road / engine noise. And that's cool. I'd like that too. But how much difference does a well deadened vehicle make, when your sitting still, and with the motor turned off ? Just a little ? ....still a lot ?
Just curious.

 

[Jtejedor]

Wow on top of the motor huh. I hope it can withstand some high temps.

 

[Aaron'z 2.5RS/WRX]

What was there before butyl based deadener? Dynamat still make a product for deadening the engine bay...

Just because it's asphalt based, doesn't mean it won't work... it just doesn't have the positive characteristics of butyl based products..

 

[Electrodynamic]

What was there before butyl based deadener? Dynamat still make a product for deadening the engine bay...

Just because it's asphalt based, doesn't mean it won't work... it just doesn't have the positive characteristics of butyl based products..

Yep, Dynamat and Cascade both make products for under the hood. I think they're more fiberglass based, but I think it has a layer of deadener on it also.

 

[FoxPro5]

VMax

Does this make a difference? Yes, it reduces structure-borne vibration noise and refracts mid frequency noise to a different route, as in it makes your firewall, dash and vents seem louder. IMHO one cannot completely "kill" noise in a vehicle, only wound it really bad. It's like herpes; never goes away and shows up where you'd least expect it.

 

[Aaron'z 2.5RS/WRX]

So John, you would have been better of doing the engine side of the firewall(and the interior side), than placing the material on the hood, I guess...yes?

 

[FoxPro5]

So John, you would have been better of doing the engine side of the firewall(and the interior side), than placing the material on the hood, I guess...yes?

My guess would be no as the firewall is convoluted and there's so many things attached to it - both would reduce it's RF and vibration potential. I could maybe see it worth it if you're doing like a kit car with a large flat firewall and you have easy access to it with the engine out, but I don't see hardly any value in vibration damping the engine bay side.

The real trick is getting multi-layer barrier(s) on the inside of the firewall as high as possible and as complete as possible.

Something like VMax is like .3 lbs/sqft. Mass blocks noise, as we all know. If your engine is blasting 100 dB worth of 250hz noise at a single layer of it...you might get a 1-2 dB reduction in the real world. On paper, you get 0.000 dB's.

 

[Aaron'z 2.5RS/WRX]

Right on, thanks.. ! I'm layered up as high as I can get without removing the dash and I might do that next winter..

 

[mSaLL150]

Obviously one of the BIG reasons people deaden their vehicles is to reduce road / engine noise. And that's cool. I'd like that too. But how much difference does a well deadened vehicle make, when your sitting still, and with the motor turned off ? Just a little ? ....still a lot ?
Just curious.

It still helps quite a bit when you consider panel buzzing, panel flexing, etc. It made a huge difference in my doors.