ANTI DRUMMING PADS

G

georgecook

Member
The Bitumastic pads fitted in the front footwells and to various parts of the car wings etc, apart from hiding loads of rust, what are they for?. Are they to stop drumming, ( noise levels) or to reduce wear on these panels or to stop rust
During restoration is it advisable to replace them, and if so ,what with?....georgecook
 
The bitumastic pads are only to reduce drumming noise.
The rusting effect is a bonus.
They may reduce wear on the panels ( increase life from 500 years to 501 years :D )

I think the effect of them is not worth their ability to assist rust.

I wouldn't remove good one's, but any that are loose or need taking off to treat the tin worm won't be missed.

Jim.
 
These are as has been said to control vibration, they aren't sound barriers so they don't need to cover the whole panel.

The solution is to use epoxy paint underneath and the apply them carefully avoiding any seams, you simply won't get any rust forming this way. They only are helpful in large, flat or flat-ish sections, they do nothing on tightly folded or over lapping panels. They are also quite handy if you have any rattly trim - apply them to the back.

The cumulative effect on most cars is more significant than you might think, the car feels more "solid" and less inclined to rattle or bang over the bumps.

Saying that on my S1 V8 I don't have any on my floorpans and there is no sign of them having been removed. A few on the engine firewall and in the wings that look like a giant band-aid (with holes) that's it.
 
I have scraped off the two pads in the front footwells as well as the ones on the rear wheel arches. I found all four were hiding rust although the ones on the rear arches looked ok.
I will be using epoxy as an underseal. Where can I obtain these anti drumming pads....georgecook
 
The brand name people use is "dynamat" you can search for this and get a well reviewed equivalent for a fraction of the price. Modern products usually have a foil layer on the outside.

The only thing to note is you really want butyl and not bitumen based products. Bitumen will stink inside and can melt in a closed car in summer.

Degrease everything thoroughly and use a roller for best adhesion. Aim for 1/3 - 1/2 coverage of flat areas. You don't need to do what the car hifi boys (wrongly) do and cover everything.

This is a really great 101 for vehicle noise control (the guy is selling product but the same principles apply to similar products). Look under "CLD tiles". http://www.sounddeadenershowdown.com/home

It's worth noting that for the reasons explained in the other sections the felt soundproofing in the P6 is for all intents and purposes useless. It simply isn't dense enough to form a sound barrier. Might have a mild decoupling effect under the carpet.
 
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