MP3Car.com - View Single Post - Cork as sound deadener? Recommend other materials to absorb noise.

greatwhite · 03-24-2008, 02:37 PM

Try this:

with the car a various speeds (and no traffic!) slip the transmission into neutral and let the engine idle. The noise you hear is "road noise" and possibly interior rattles. Whatch your speed and rpm before you slip it back into gear please!

Now at idle in park, slowly rev the engine up to driving rpm (around 3,000 or so) this is engine noise (well, exhaust noise is in there too). Don't get too crazy revving the engine in park either!

Now that you know which noise is which and where it is comming from, you can start attacking each source and retest the same way when you think you have it. You want to attack the the noisiest offfender first to get you best bang for the buck (IE: floor wheel wells, firewall, trunk, etc)

Keep in mind, this is just a low buck way of finding noise.

If you start laying on the dynamat (or whatever you choose, that McMaster-Carr mineralized vinyl sounds interesting) and notice a "tar like" pad on the panels, leave it there. That is the OE noise dampers and is probably there because an engineer found that was the best place for it to reduce noise during NVH testing.

Cheers.

03-24-2008, 02:37 PM	#14
greatwhite FLAC Join Date: May 2007 Location: Top o' the world Ma! Posts: 1,269	Try this: with the car a various speeds (and no traffic!) slip the transmission into neutral and let the engine idle. The noise you hear is "road noise" and possibly interior rattles. Whatch your speed and rpm before you slip it back into gear please! Now at idle in park, slowly rev the engine up to driving rpm (around 3,000 or so) this is engine noise (well, exhaust noise is in there too). Don't get too crazy revving the engine in park either! Now that you know which noise is which and where it is comming from, you can start attacking each source and retest the same way when you think you have it. You want to attack the the noisiest offfender first to get you best bang for the buck (IE: floor wheel wells, firewall, trunk, etc) Keep in mind, this is just a low buck way of finding noise. If you start laying on the dynamat (or whatever you choose, that McMaster-Carr mineralized vinyl sounds interesting) and notice a "tar like" pad on the panels, leave it there. That is the OE noise dampers and is probably there because an engineer found that was the best place for it to reduce noise during NVH testing. Cheers. __________________ For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return. Leonardo Da Vinci Last edited by greatwhite; 03-24-2008 at 02:43 PM.