The improbable task of silencing the 4bd1 county

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Originally Posted by 110Landy86

Wavebar by pyrotek is another good product on the market. I also went to the effort of applying a layer of Dynamat and flashing ($60 for 10 m x 300 mm roll from hardware) to all internal surfaces of the seat boxes - this made a difference.

A test application of dynamat/ flashing and closed cell foam on the drivers door yielded good results- door closes with a thud like new cars :D plan on treating the others. Have a stick of silicone handy to plug up any apertures.

I'm at the point where I can hear my indicator while driving ~60 km/hr with driver window down. Still a lot more to do. Next is MLV over dynamat treated floor panels.

Chasing sounds and vibrations on an agricultural landy makes you weary!!

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I bought my mass loaded vinyl and other soundproofing products from Pyrotek. Wavebar isn't ringing any bells in my memory unfortunately (in my defense it was a few years ago).

I used Pyrotek because I have often worked with them for various refractory and insulation products for furnaces, etc. and knew the then local manager fairly well.

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Originally Posted by Dougal

Without boost you get an ignition delay between the fuel being injected and combusting. This is the diesel clatter we all know well.

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Thats interesting - when I set my 300tdi injection timing properly the rattle decreased a lot(it was very retarded) .

One of the reasons I sold my 85 Isuzu County years ago was the engine noise (and the bloody door locks).
Then I bought a Defender 300tdi - go figure??.

Terry

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Originally Posted by Brad110

Passengers will absorb the sound

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My passengers never did - particularly when they were 5 years old and younger.:D:D

Terry

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Originally Posted by Dougal

How is the toughness and surface finish?
I've got some stuff I put through my work car, but the finish is chopped-strand like fibreglass which can't be used as a top-layer and it rips if I try to ease it around corners.

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Pretty good. You can cut it with a sharp box knife. The surface is sort of rubbery and if you really want to you can tear it but for what it is designed to do i see no problems.

There was an off cut that I had lost (left it on my black wing protectors and went for a drive) that I found while walking down the road near my house. It had been on the road for maybe 3 months being driven over and it was a little worn but fine.. in fact I used it when I put some more in.

I have topped it with carpet (matt and carpet glued together, then velcroed to the floor / dynamat covered panel) and it works well. If you used it for a top coat it would wear and become tatty. It has hessian in the middle to hold it all together.

For those interested...

Wavebar is a dense, thin, highly-flexible, tear-resistant and strong mass loaded vinyl. These properties give the product high transmission loss throughout the various frequency ranges.

Other Wavebar variants:

Wavebar Original: Heavy mass-loaded vinyl noise barrier with a reinforced fabric backing

Wavebar Quadzero: Foil faced noise barrier for improved flame resistance

Wavebar Outdoor: UV resistant covering with a reinforced fabric backing - greater strength and is self-supporting

More info here: Wavebar Original light flexible mass-loaded noise barrier | Pyrotek NC

Cheers!