Sound deadening materials

[GREG]

Trade it in for a Blenheim 4 !

Or drive a Land Rover for a week and it will seem silent

Or buy a louder 8 track

Or wear a motorcycle helmet

Or fit Fraser Nash electric motors to each wheel

Or cover everything inside with Dynamat like on the Yanky custom car shows

Hope this helps :-)

[lansdownplace]

Originally Posted by GREG

Trade it in for a Blenheim 4 !

Or drive a Land Rover for a week and it will seem silent

Or buy a louder 8 track

Or wear a motorcycle helmet

Or fit Fraser Nash electric motors to each wheel

Or cover everything inside with Dynamat like on the Yanky custom car shows

Hope this helps :-)

Have tried one of the above!....does Dynamat work?

P

[GREG]

Yes - it works very well and makes the radio / 8 track sound better too !

[lansdownplace]

Originally Posted by GREG

Yes - it works very well and makes the radio / 8 track sound better too !

I am very tempted to get an eight track, maybe Tadpole Radios could convert it to keep the 8track and allow it to connect to a modern stereo.

I am going to have a look at Dynamat later at the local stereogram shop

P

[GREG]

Go for it !

Vintage 8 track player in dash expo streamline model unused & boxed | eBay

[lansdownplace]

Originally Posted by GREG

Go for it !

Vintage 8 track player in dash expo streamline model unused & boxed | eBay

It looks as if it might just fit in the second slot in my center console. I am trying to find out the dimensions. I really like the idea of being able to kick in an eight track. The next challenge will be wiring it into the existing system, I should be able to route it though the Aux input on the more upto date head unit.

I might have to strip out all of the sound deadening in a bid to mask the sound quality!

P

[Kevin H]

I glued sheet roofing lead to the petrol tank in my 411. It was very effective at stopping the sound of fuel sloshing around in the tank.

Sound is transmitted into the car by panels (side or floor) vibrating. You can either suppress the sound transmitted by the vibrating panel, or stop the panel vibrating in the first place, by adding mass to the panel. Lead does this very effectively.

[Philip]

You need to differentiate between damping panel resonance and vibtration (which is what Dynamat and the like do) and actually blocking sound.

Dynamat-style resonance dampers aren't designed to be used as a sound barrier and it's only necessary to cover about a third of a vibrating/tinny-sounding panel for the damper to be effective.

To actually stop the road/engine/exhaust noise getting into the interior you need a contiguous barrier layer, which needs mass (e.g. 5 kg/m mass-loaded vinyl, lead sheet etc.). To gain maximum benefit this layer needs to be as complete as possible (taped joins, no gaps) and to be decoupled from the floor/bulkhead/whatever by a layer of something like closed-cell foam (which might also help absorb some high-frequency noise).

[Thor]

What Philip says is all true.

A company called Noisekiller Acoustics makes a range of materials. They have a dynamat-type stick-on material and also a heavy-ish foam backed rubber material which can be cut to shape and laid under carpets, etc. this material is flexible engought to shape around trans tunnels, etc.

If the air vents make a big difference, and if in that sense you would be quite happy with the refinement of the cabin if the air vents could always remain shut, then your problem is (obviously, I suppose) noise transmission through the vent system. The way to tackle that would be by lining various parts of the vent system with sound absorbing materials. They should also be fire resistant, of course. A sound absorbing material is a material with a sound-porous surface, and a layer below the surface which absorbs and breaks up the air vibrations. This might take the form of a thin layer of perforated but closed-cell foam over a layer of open-cell or even reticulated foam.

On some noisy semi-race engines I have had some success by just lining the induction air pipes with a fire-retardent reticulated foam.