How would you sound deaden engine compartment?

[cali yaris]

Wouldn't you deaden the firewall from the inside of the car?

Dynamat makes a heatshielded foam that is meant to go on the bottom side of the hood.

that's the way to go if you're trying to cut down engine noise. I'm going to try spraying my wheel wells with that "texture coat" stuff and see what that does. There was a thread about this once upon a time - who did it already?

[talnlnky]

Originally Posted by cali yaris

Wouldn't you deaden the firewall from the inside of the car?



that's the way to go if you're trying to cut down engine noise. I'm going to try spraying my wheel wells with that "texture coat" stuff and see what that does. There was a thread about this once upon a time - who did it already?

I put 3/4 of a can in each wheel well... I think it helped a VERY small amount.... mostly when a rock gets thrown by a tire and flies into the well. Sound is quieter now... I think that rubber stuff kind of cushions the rocks impact. It does put on some weight, but not a whole lot. Each can is something like 16oz.

People try to combat sound going into the firewall multiple ways, the deflectors & foam on the inside of the bay would be the most common (for inside the bay)... and foam & mat on the inside of the cabin the most common for inside the cabin.


A tapping noise.... the deflectors & foam I think would be best... but really, how much of that can you really get rid of? You have vents, that intake air around the engine/hood area... the sound is coming from the engine. you will always have some transference.



One word of caution about sound dampening... when you first dampen a car like i did last spring. 40sq feet on the floor boards & wheel wells, 20sq ft on the side panels of the hatch, + 40sq ft of thin foam on the floors, + 2" foam in the hatch door, over the spare tire, and in the side panels (by the rear seats). Well.... when you first do this, sound does drop a considerable amount, and humans partially perceive speed through the sounds they hear.

YOU DRIVE FASTER WHEN ITS QUIET. I remember I had to put a little more pressure on the brakes than I thought was needed because I kept on approaching stoplights & cars a bit too fast because it took awhile for my brain to readjust to the now quieter car.