Underbonnet sound deadening

[Captain_Rightfoot]

I just had to give a report on this stuff. We fitted some underbonnet sound deadening to the Defender the other day. It cost fifty bucks, and about half an hour to fit it.

Before the car left the garage we thought "just wasted 50 bucks [img]style_emoticons/<#EMO_DIR#>/sad.gif[/img] " However, it made a huge difference. I mean the car is still the noisiest car I've ever owned, but the noise is now acceptable to us. You can open the flappers and hear yourself think. It has reduced all engine noise by a bit, which makes all the difference. The only downside is you can't hear the turbo as much [img]style_emoticons/<#EMO_DIR#>/sad.gif[/img]

Anyway, it was underbonnet sound deadening from this place [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]

http://www.tru-fitcarpets.com.au/

[kaistuff]

do you think the FELT WITH BITUMEN BARRIER UNDER LAY for the inside of the fire wall can improve the noise level further?
-
Kai

[Captain_Rightfoot]

Originally posted by kaistuff
do you think the FELT WITH BITUMEN BARRIER UNDER LAY for the inside of the fire wall can improve the noise level further?
-
Kai

I'm sure it would. I reckon it would be a big job though to install it prorerly though. 8O I would think that if you took the time to install this stuff you'd be getting close to disco td5 noise levels.

The stuff I put on only took half an hour to fit, which I really liked [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] It made a far bigger difference than you would think too.

Maybe give the underbonnet stuff a go, and see if you're happy with that first. [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img]

[101RRS]

Years ago I had a series 3 that had a blown engine - when it was out I put in underbonnet deadening and some on the firewall (different type). I also put some on the inside on the floor and inside firewall - after that I could even listen to the radio (Albiet with difficulty) and no longer needed to lip read when my passenger talked.

The stuff is worth considering - heavier is better.

Gazzz

[110county]

Hi All

Have had a little experience with sound deadening in my county, wasnt happy with felt/bitumen type as when it gets wet (surely not inside the car!!!) it will rot and stink so an alternative was found. Found out the ducks nuts of sound deadening is Barium impregnated vinyl which comes in rolls and different densities from 4kg/sqm to 8kg/sqm i bought a roll for about $200 (60kg) and it was just enough to do the whole car inside doors and all. This however needs to be "decoupled" from the body so i decided on closed cell foam which wont absorb water and is quite cheap as camping matresses simply glue to vinyl and in it goes. Worked a treat also put some under the bonnet with reflective foam cover, was great improvement till I took out the v8 and put in the isuzu anyone want some used sound deadening :wink:.

In the right car (not a 20yr old county) would be great but tyre noise and wind noise can seem to make up for any loss of engine noise. Theres a mob in Dandenong (Vic) who were very helpful with expertise and had a warehouse full of different products and threw in a few freebees, name of Pyrotek, ph 97069077

Well thats 10c worth

cheers

[Rosco]

Originally posted by Captain_Rightfoot
I mean the car is still the noisiest car I've ever owned, but the noise is now acceptable to us.
http://www.tru-fitcarpets.com.au/

[img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] ...... Ya get that with Fenders

Cheers

P.S. Shouldn't you be back 'o Bourke by now [img]style_emoticons/<#EMO_DIR#>/tongue.gif[/img] [img]style_emoticons/<#EMO_DIR#>/tongue.gif[/img] :?:

[rmp]

It makes a huge difference. About 4db, having measured it. It's the single most effective way to reduce noise. I used some special material from Accustop/Purple Pig. Recommended.

[Michael2]

Has anyone tried applying sound proofing to the bell housing. I'm guessing that this "drum" would conduct quite a bit of sound from both the motor and the transmission.

I suppose on a series vehicle the floor can be lifted off and some applied to the top of the bell housing. I might get around to trying this one day, but if anyone has tried it, let us know.

Obviously this would be in conjunction with underbonnet, firewall, underseat and transmission tunnel insulation, but I'm thinking that insulating the bell housing may have a discernable effect.

I suppose a sound deadener on the inside of the bell housing (that won't foul any clutch operation) would be more effective.

Ideas from acoustic engineers are welcome.

[Rosco]

Originally posted by Michael2
Ideas from acoustic engineers are welcome.

How about industrial quality ear muffs :?: [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img] [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]

[Michael2]

But I want to be able to whisper in the car [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]