sound damping

Lefty · Uber Guru

sound damping

427carl · A Poncho Legend!

I used a product from Jegs that is very similar to Dynamat Not too expensive and cut to fit..

tin indian · Poncho Master!

lizzard skin makes a really good one. dale from nos posted a link for more info on it around x-mas i think. it was on another post about undercoating i believe

cdnpont · Canadian Poncho Superstar!

Here's a place in Lethbridge Alberta that has some good products at fair prices. I bought some insulation from them to do my boats engine cover, and I can say they're great to deal with.

B-Quiet

jim_ss409 · Guru

I went crazy with Dynamat on my last project, a Mack truck. The results were disappointing. As you can see in the pictures, I covered every square inch of the floor and firewall. I also completely covered the insides of the doors, much of the roof and back of the cab.
After doing some research I found that Dynamat and other similar products are mainly designed to deaden vibration in panels like the floor and doors. It's not all that effective at blocking or absorbing sound.
I notice that OEM's use Dynamat style products but they only use a little. I was looking at a door from an Acura and it had only one little piece about the size of a pack of cigarettes.
I don't know that much about it but I did spend a few nights reading about the subject and it seems that a little Dynamat in the right place will go a long way. Covering an entire panel will only reduce the sound a tiny bit. I gathered that Dynamat style products are just one piece of the puzzle. In order to really reduce the noise level you need to use a combination of things like padding, carpets and dense plastics or rubber.
When I refer to Dynamat I'm talking about the regular thin sound deadener they sell. They also sell a lot of different products. I used their "Hoodmat" product which is a sticky backed foam that's about 1/2" thick. I used some of that under the hoods of that truck and it made a noticeable reduction in the noise level.
I think that kit Lefty got from Classic would probably work fine. It couldn't hurt to get some Dynamat to put in the doors and roof but just don't go crazy and cover the whole panel.

jim_ss409 · Guru

Here's a few more pictures of that Mack truck cab. I was hoping it would be nice and quiet but it's not.

The whole inside has a coat of that do it yourself boxliner stuff.

The bottom of the cab's done too.

Then lots of Dynamat.

There's also some extra padding on the floor. I think that probably helps.

59poncho · Poncho Master!

i remember reading in a car mag that someone tested dynamat and the stick on house roof stuff ( i think the rubber type stuff you use at the edge of the roof for water protection) and it was the same. They tested it with some sort of machine that tests density i think. I will see if i still have the magazine. Thats what im going to use, alot cheaper and i have a LARGE area to cover!!LOL

Lefty · Uber Guru

Truck looks fantastic !! to bad it did not work as well as you wanted it.
how about a product like this (Quite Car)
http://www.quietcar.net/?_kk=dynamat&_kt=18c5f2c6-48ef-48e8-a1b5-31d3bca6e510&gclid=CPTs_Zmb-qYCFQkPbAodfXD-Ew

Lefty · Uber Guru

That ruck looks fantastic !! Im glad i asked about the Dyna Mat.
Will look more into the products like
Lizard skin
http://www.jegs.com/p/Lizard-Skin/Lizard-Skin-Insulation-and-Accessories/1122693/10002/-1?sendroicid=bbef8492-2d00-41d6-b158-38db0de2603c&sendroiad=3824514791&sendroikwd=lizard+skin+insulation&gclid=CNnJz5-c-qYCFQcKbAodrgcGEA
or Quiet Car
http://www.quietcar.net/?_kk=dynamat&_kt=18c5f2c6-48ef-48e8-a1b5-31d3bca6e510&gclid=CPTs_Zmb-qYCFQkPbAodfXD-Ew
Has anyone tried them ??

jim_ss409 · Guru

I'm sure Quietcar and Lizzard Skin are good products.
http://www.quietcar.net/
I also think Dynamat is good but it's also expensive. The mistake I made was thinking that if I used a lot, the truck would be extra quiet. Once you've used enough to take the resonance out of a panel you don't gain much by using more.

I'd bet that the rubber roofing stuff 59Poncho mentioned would be every bit as effective for dampening the floorboards for a lot less money. The Dynamat does stick very well to a roof and of course the spray on products would also be great.

I noticed on the Quietcar site a comparison between a treated and untreated symbol from a drum set. You could get a similar effect by holding the symbol in your hand. The product certainly absorbs the vibrations which is great but from what I've read none of the thin damping products are very effective at actually blocking or absorbing sound from an outside source.

Even the most expensive luxury cars only use small amounts of dampening material. That ought to tell us something. Of course new cars are designed with quietness in mind so they don't resonate as much as our old cars do and the OEM's would know exactly where to place the dampening material to get the best effect. When we're doing our cars we'd have to use more material.

They say that panel resonance is an important part of achieving a quiet vehicle but dampening the panels alone won't make a car super quiet.