How would you sound deaden engine compartment?

[Yawesh]

Originally Posted by talnlnky

well they claim over 300F resistant. You don't have to worry about it burning up, just peeling off due to high temps... I have a hard time believing that under the hood it'll get much hotter than 250F... even if its tripple digits outside, unless you're driving the car at high rpms and low speeds.


firewall is the main thing... tho it'll be a bitch to matt that area.

Quite frankly, there's not much noise from the engine compartment... most noise comes from the floor boards and the wheel wells due to imperfections in the road.


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

just want to get rid of the annoying engine "tapping"

[Bob_VT]

Originally Posted by Yawesh

just want to get rid of the annoying engine "tapping"

Turn off the engine!

Automotive engineers concentrate on soundproofing the passenger compartment from the inside. You could install dynomat or soundproffing behind the firewall..... alot of work. Go for it and let us know.

[fuji]

I think what you are talking about is reducing the noise from the engine compartment.

There are several ways to reducing the noise.....

Barriers - Lead, mass loaded vinyl - dense enough to reflect sound away.

Dampeners(Raamat, damplifier) - dampen vibrations and subsequent noise transmitted by the sheet metal which is about 30-50% of noise generation. Do not confuse these with barriers. They do not reflect sound well.

Absorbers - particular foams, cotton - these can actually absorb sound therefore reducing noise.


If you are going to use a dampener material, spend the extra money and use Second Skin Audio Damplifier or Damplifier Pro. Its temp limit is 500 degrees. possibility if spectrum liquid.

Now the problem is how do you access the firewall?? I did see an article not too long ago in an article for front strut bar installation where you can remove the wipers and plastic cowling. There is some access to the firewall. Another option is to get to the firewall from the inside - that will be tough

A much easier solution I have seen is treating the underside of the hood with a dampener and sound absorber. Damplifier and motor mat have been used bu others with good results. This is what I am planning on doing. I am waiting for my order to arrive. I will also try to access the firewall.