Sound and Heat Insulation

[454]

Hi guys,

I'm making good progress on the panelling on my GTR and am just about to complete the engine bay rear bulkhead.
I'd like to put some sound and heat insulation between the 2 skins to help protect the cockpit and makes things a little more comfortable.
Have any of you done this and if so what material did you use ?

Thanks in advance for any ideas / suggestions

[USCANAM]

Use 1 1/2" solid foam insulation purchased at building supply.
<a href="http://home.comcast.net/~rosenracing/wsb/html/view.cgi-photo.html--SiteID-574314.html">http://home.comcast.net/~rosenracing/wsb/html/view.cgi-photo.html--SiteID-574314.html</a>
You also might want to consider this too.
http://home.comcast.net/~rosenracing2/wsb/html/view.cgi-photo.html--SiteID-574364.html
Also used the same 3/4" foam in forward most skinned area.
Jack



>> Edited by USCANAM on Saturday 7th February 20:38

[Steve_D]

Jeremy
Are you double skining the whole bulkhead top to bottom?
I did mine using adhesive backed sound mat inside the skin to the cockpit and filled the rest of the cavity with felt. I did all the skins with the sound mat.
If you look in 'Chassis' on my site you can see pics of all the stages.
My Site
Steve

[BigAl1]

454,
I'm at about the same stage of panelling also. My plan is for 1 layer of TruMax (sound and heat insul.) plus one layer of 1/2" sound foam in the 3/4" floor area. The same plus a 1/2" insulation foam board in the lower firewall area. All the panels around the cockpit are also painted with StealthKote sound deadening paint, keeping it hidden from finished view.
The TruMax Super is a 5/16" thick fabric material treated with fire retardent, then covered on both sides with aluminum foil. I ordered from Summit Racing in the USA.

Allan

[Ikom]

454 said:

Hi guys, I'd like to put some sound and heat insulation between the 2 skins to help protect the cockpit and makes things a little more comfortable. Have any of you done this and if so what material did you use ?

Hi 454
On heat and noise – I have purchased a 24 foot bulk roll of Heat Shield material from J.C. Whitney – most inexpensive solution IMHO. See:
www.jcwhitney.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&AID=5900428&PID=1068315&productId=394&catalogId=10101&storeId=10101

I will be using it in conjunction with mineral fibre fire stop material within the double skin panels and using it singly at the rear bulkhead, front and storage bins.

I do not want to use any combustible material (or material that has the potential to off-gas harmful fumes) in a car's cockpit, hence the decision to use fire stop material, which incidentally is used to close off openings in buildings between fire separations, smoke zones, duct and pipe pentrations etc. It also has decent acoustic properties.

[454]

Thanks for the info

It seems like there are a few different ways of doing this.
I've had a search around and found this stuff :
www.agriemach.com/product_info.php?cPath=0_7&products_id=427

A friend who works on MOD vehicles can get me some of the dense foam type insulation used on their vehicles which is apparently very high quality.

I'm thinking of putting the reflective layer on the engine side of the engine rear bulkhead to reflect most of the heat from the cockpit and then using the foam sound and heat insulation between the 2 skins to take out some noise and any remaining conducted heat.

The stealthkote paint sounds good, haven't seen that before. Is it easy to apply ?

[BigAl1]

454,

See www.stealthkote.com/ for more info about it. They recommend a Schutz spray gun to apply, but roller, brush, or trowel are ok to use. I brushed it on thick, 3 coats total to build thickness. I have 1-2mm wherever it is applied. Initially I was slightly disappointed with it's performance, but after 9 days of the second curing stage, I am more impressed. The panels are a dull "thud" when tapped with a finger, compared to a bass drum previously. No way to measure it's performance until I'm running and compare to another similar GTR (3 years away!).
Allan