andyps
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posted on 30/1/18 at 11:28 AM |
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Heat reflective foil under bonnet
Not for a locost as my project/build is very much on the backburner at the moment (hanging from the rafters of the garage actually) but figure this is
a great place to get advice on something due to the collective knowledge of the forum. I've just bought a fibreglass bonnet for my Fiat Coupe
20VT which I use for hillclimbing and am thinking that it would be a good idea to put something under the bonnet to reflect the heat from the engine
and hopefully prevent damage to the bonnet and any paint I apply. I don't want to use the insulation that was on the original metal bonnet as
the main purpose is to save as much weight as possible. I have found aluminium tape in 100mm width which might be OK but can't find bigger
sheets. I remembered that McLaren used gold reflective foil in the F1 but don't think my budget will stretch that far so looking for a cheaper
alternative. Any ideas?
Andy
An expert is someone who knows more and more about less and less
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40inches
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posted on 30/1/18 at 11:33 AM |
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Try bike fairing protector sheet?
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peter030371
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posted on 30/1/18 at 11:53 AM |
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This place does quite a few different types, I used the 'reflect-a-cool' on my Striker and it works quite well.
https://www.agriemach.com/c7-heat-and-sound-insulation
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andyps
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posted on 30/1/18 at 12:12 PM |
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quote: Originally posted by peter030371
This place does quite a few different types, I used the 'reflect-a-cool' on my Striker and it works quite well.
https://www.agriemach.com/c7-heat-and-sound-insulation
Thanks for that link, looks like some good products there and even a gold one!!
Andy
An expert is someone who knows more and more about less and less
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motivforz
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posted on 30/1/18 at 07:33 PM |
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It depends what you're aiming to protect from. Exhaust manifolds, turbo housings etc might get into the order of a few hundred degrees,
everything else should be <130deg .
Below 500°C radiation is quite low as a proportion of all heat transfer, compared with conduction and convection. You're best off trying to
contain the heat and move it elsewhere if you think you've got a heat issue. Thinking of heatshields, air ducts, wrapping the exhaust etc. (bear
in mind the silencer/downtubes will get hotter!).
As for general protection of the bonnet - an air gap is likely to be the best for radiation and convection. Anything with a bit of thickness to it
would be good. I suspect that a film/foil type solution will look good but likely not do much for reducing the GRP temps.
Happy to be proved wrong, and my experience is on slightly different applications!
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