[xj-s] Hood insulator for Temp. and Sound

Ok,
So V-12’s have a heat problem. Some people have put aluminized, fibrous
insulation mats on the underside of their bonnets to minimize heat and sound
egress. Why insulate? Mightn’t it be better (if one was not concerned
about sound) to use no insulation there, and instead paint the area black?
(Black body emissivity and all)
My mother-in-law actually came up with this idea, and it seems sound to me.
I’ll be installing fresh air intakes and eliminating the first mufflers on
the Coupe, so sound isn’t as big of a deal as it is on the 4-door sedan.

On a totally unrelated note, I picked up the V-12 HE engine today for the
coupe project. Cool…

Greg (Wondering which insulator to use) Meboe
86 XJ-12 HE Greg@Meboe.com
76 XJ12C HE http://meboe.com/greg________________________________________________________
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Well there is 1 thing behalf the hood insulator.
I dont have it now. (I will put it)
The wax on the hood is not nice looking.
Because of the heat that forms in when the car is parked the center part of
the hood is kind of “pale” compared to other nice shiny red parts of the
hood.
So if wax will change the colour in that part because the heat maybe the
paint will react also.

I belive paint will take a lot more heat to be affected but in long run…

Aleksi----------

From: Greg and Dianne Meboe
To: xjs
Subject: [xj-s] Hood insulator for Temp. and Sound
Date: 18. Juneta 1999 07:41

Ok,
So V-12’s have a heat problem. Some people have put aluminized, fibrous
insulation mats on the underside of their bonnets to minimize heat and
sound
egress. Why insulate? Mightn’t it be better (if one was not concerned
about sound) to use no insulation there, and instead paint the area black?
(Black body emissivity and all)
My mother-in-law actually came up with this idea, and it seems sound to me.
I’ll be installing fresh air intakes and eliminating the first mufflers on
the Coupe, so sound isn’t as big of a deal as it is on the 4-door sedan.

On a totally unrelated note, I picked up the V-12 HE engine today for the
coupe project. Cool…

Greg (Wondering which insulator to use) Meboe
86 XJ-12 HE Greg@Meboe.com
76 XJ12C HE http://meboe.com/greg


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“Peltomaki Aleksi (NTC/Zurich)” wrote:

I belive paint will take a lot more heat to be affected but in long run…

As I’ve just sanded back the paint on an entire XJ-S, I can add a little to
that.

There was no noticeable discolouration of the bonnet paint on my rather faded
1977 model. However, the paint was unquestionably affected by engine heat, to
the extent that it was much HARDER than the paint on the rest of the car.

I wouldn’t be surprised if this affected colour and/or sheen over time. I’ll be
insulating my newly painted hood.

Jason