Thread: Bundalene's Puma project

Originally Posted by c.h.i.e.f

Rijidij I also hav a problem with noise levels with the isuzu but as most of us know its not exhaust noise its engine noise so everyone recommends this product as a sound deadiner?

Originally Posted by isuzurover

No - the foil-backed low density foam stuff is very poor at stopping noise transmission. It is reasonable for heat though.

There have been a few discussions on this if you search.

G'day Ben,
I would refer to the formshield as high density closed cell foam. It certainly made a big difference to the noise levels in my County. Are you sure you're talking about the same stuff ? It's recommended as a thermal and noise insulator here >>>> Formshield <<<< That's why I used it as it had a bit of both. I'm sure the dedicated noise insulating sheet like Erich is using is better for sound proofing though.

Cheers, Murray

Having 'experienced' the lr/ defender experience with the kilometres and trips that sheila and yourself have done it should be nice to drive a cool, quiet defender for a new experience.
Good luck

Originally Posted by rijidij

G'day Ben,
I would refer to the formshield as high density closed cell foam. It certainly made a big difference to the noise levels in my County. Are you sure you're talking about the same stuff ? It's recommended as a thermal and noise insulator here >>>> Formshield <<<< That's why I used it as it had a bit of both. I'm sure the dedicated noise insulating sheet like Erich is using is better for sound proofing though.

Cheers, Murray

Hi Murray,

It is low density compared to any decent soundproofing material. The link you posted says 28 kg / CUBIC metre!!!

Also - as Offender90 (professional acoustics engineer) has posted - foam needs to be OPEN cell for noise supression. Open cell low density foam is good at stopping sound reverberation.

I have bought some and used it - on the underside of my bonnet. It made a slight difference, though I think that was more due to reducing vibration of the bonnet.

3-4 db noise reducted claimed by the formshield is fairly low.

As discussed previously in this thread, the properties required to reduce sound transmission are opposite to the properties required for thermal insulation.

Hi Erich

what is the material you are using for insulating your firewall?

Thank you

Originally Posted by lebanon

Hi Erich

what is the material you are using for insulating your firewall?

Thank you

Hi, I have used 2 materials for heat proofing the cab.

Underneath I used 2 layers of a material I recently purchased from Thermotec with an R rating of 3.5, an aluminium backed (both sides) with an open chemical resistant foam. This had to be physically held in place. I used this so that I could still remove the floor or tunnel sections of the cab.



I found this difficult to attach to the firewall, so I used another product which I bought from Clark Rubber about a year ago. This has a heavy aluminium backing on one side, attached to about 12mm of foam and a peel off stick on layer on the other side. I have used this for it's heat reflective properties and am unaware of the R ratings, nor it's acoustic credentials.


I will be using another product namely Nuware or Wavebar, for sound proofing on the inside of the cab.

I am no acoustics nor thermo-dynamic engineer and am only using products on recommendations. I am advised that the best sound proofing products for automotive applications are in the form of dense mats. There are many products available such as 'Resomat' (5kgs per sq meter), 'Dynapad' (5.5 kgs per sq meter) etc etc. The Nuwave which I will use is available in 4, 6 & 8 kgs per sq meter. I was advised to use 6 kgs per sq meter.

The material from Clark rubber weighs a few kgs for a whole roll - not very dense at all.

Hope that helps,

Erich

Looks like I'll give that nuwave a go because the noise from the engine coming through firewall is terrible

Fantastic project. Nice to see the 'insides' of a Puma exposed. Can't belive how fast you work. It takes me ages to get things done, and I wish I had more time in my life to get stuck into my 130.

Thanks for the tip about the KBS paint system. Sounds very like POR-15. Have sent off for a brochure.

Erich,

Great work!

The heat eminating from the transfer/exhaust area and being felt in the seat box is a real issue. I noticed this again on mine after the trip from Sydney to the Abercrombie NP on the weekend.

Do you think that it would be possible to install the heat insulation without taking the body off?