Thread: The improbable task of silencing the 4bd1 county

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.

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

Originally Posted by Brad110

Passengers will absorb the sound

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

Terry

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.

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.