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bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2213

Closed Cell Foam Under Bonnet?

Evening chaps,

Been doing some hefty soundproofing over the past week or so and got some 6mm closed cell foam left over, its not foil lined or anything just wondering if it would be alright to use under the bonnet?

Or could I stick some ali foil to the foam then use it?

Thanks
Josh.

21st Dec 2017 8:38pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4801

I would get the bonnet specific stuff personally. In the summer and under big loads even a diesel can create some pretty high under bonnet temperatures.

Having said that, if you really want to use it then I would definately foil line it first

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21st Dec 2017 8:51pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2213

Yeah I see what you mean! Mainly just as I have some left over and being closed cell wont absorb water! Where as the proper under bonnet stuff is usually open cell which fills up with water and eventually sags and falls down

Got a layer of LizardSkin on it now so that should make a difference anyhow

Cheers

21st Dec 2017 9:06pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4801

Sealing around the edge of the bonnet makes quite a big difference as well. I did mine with 15mm × 15mm closed cell foam strip

21st Dec 2017 9:11pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2213

Not a bad shout that, think ive got some neoprene left over from making new bulkhead vents. Pretty big gap there too!

21st Dec 2017 9:16pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4801

21st Dec 2017 10:16pm

zsd-puma

Member Since: 09 Aug 2016
Location: Kent
Posts: 2720

2010 Defender 110 Puma 2.4 USW Santorini Black

I think the foil covered stuff just cooks the engine plastics, as it just reflects all the heat back.

I've got some black under bonnet foam, basically a foam with a sort of perforated vinyl on it. It's lasted fine over the past year, and the adhesive is giving up a bit around the edges but it's not coming off enough to worry about.

I also put some foam strips along the sides and front of the bonnet so it seals against the wings and front panel, that makes a surprising difference to the noise and keeps most of the water and dirt out.

22nd Dec 2017 1:28am

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2213

Cut the foam, foil backed and glued in place with some high temp (200c) sprayglue! Currently being weighted down, ill get aome pics shortly

22nd Dec 2017 12:48pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2213

All done! Quick and simple to do, did the edge of the bonnet as suggested, had just enough left over.

Preliminary results a tad quiter but it is alot more "dead" very few rattles and the like. Well worth it!

Click image to enlarge

22nd Dec 2017 2:41pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4801

Looking good, I need to do my bonnet again, it was all stripped off for the respray

22nd Dec 2017 3:47pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2213

Nice! Think if I ever got mine resprayed it would be with Buzzwelds super tough paint! Same colour of course i love my epsom green landy

22nd Dec 2017 4:24pm

grafty99

Member Since: 15 Aug 2012
Location: North Devon
Posts: 4801

I had everything done with buzzweld 2k chassis armour on the inside, definately helps to deaden the panels

22nd Dec 2017 4:31pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2213

Very nice indeed!!

22nd Dec 2017 4:45pm

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