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I just did a bunch of research for this on a new car I'm getting. From what I was able to learn, the CCF and MLV block road & tire noise, but the butyl sound de
by the_pwner224 6y ago
I just did a bunch of research for this on a new car I'm getting. From what I was able to learn, the CCF and MLV block road & tire noise, but the butyl sound deadener products are still important to stop the sheet metal from vibrating and to stop resonance in the door cavity & trunk.
25-50% coverage with butyl directly on the sheet metal is enough, since it doesn't block sound, just absorbs vibrations. If you tap your doors or trunk lid, or if you swing the door shut, the sheet metal will have a tinny hollow sound, but after butyl all of those become more of a solid 'thunk.'
Overall, the butyl stops the sheet metal from making its own noise and from amplifying the tire vibrations; then the entire surface needs to get 100% unbroken coverage of the CCF/MLV to block all types of noise from entering.
Demonstration: https://www.youtube.com/watch?v=_ur_Rhi5js8 https://www.youtube.com/watch?v=_ur_Rhi5js8
- vosper 6y agoI think the affect of the butyl dampener on actual internal vehicle noise is minimal. I've done that part, and my doors close thunkily now (not that I ever cared) but the car is just as loud as ever inside. I think that unless you're going for high-performance audio, there's really not a whole lot of value in the sound deadener. > 25-50% coverage with butyl directly on the sheet metal is enough This is true, you see in a lot of the professional installer videos that they will cover the whole surface in the deadener, but it's not necessary.