Afternoon Ladies & Gents,
What heat management do you recommend for general under bonnet surfaces....paint? Mat? I`m considering the aluminium/silica self adhesive sections as
opposed to the `glue it yourself style` for ease of fitment.
Has anyone used these types before? Are they easy to fit?
So far I`m using black exhaust wrap and Gold DEI tape for temperature critical components (air intakes and ECU`s).
[Edited on 19/6/11 by StuartBJ]
Stuart - it's going to look very pretty under there anyway with all that gold - just make sure the pikeys don't see it!
That V12 is going to chuck a fair amount of heat out if my XJS V12 was anything to go by! Wrapping the exhausts will help, but don't forget this
will move that heat further down the exhaust "chain" so you'll need to be careful how close the exhausts get to anything combustible,
particularly around the CATs, obviously all the standard stuff on the engine will have been made to withstand the heat under a Merc bonnet which is
probably at least as bad as anything you're likely to generate due to the extra workload of dragging a 2 ton car around, I would think the
fibreglass itself should be ok as long as you've got a bit of space between the engine & bonnet, if it's really tight anywhere I think
I'd look at venting it in that area. Might be worth attaching some thin ali sheet to the under bonnet with an air gap between ali &
fibreglass if you have room?
One VERY important point to remember is that at IVA they are going to run it up for the noise test at high revs, the speedo checks for all speeds up
to 70 at 10mph increments & then if it doesn't pass the BETs test first time you may have several runs of a couple of minutes held up at 3000
rpm, all stationary & IVA centres don't supply any additional cooling - I now take along an extra fan to keep things cool during the speedo
& emissions tests
Hey Russ, an XJS V12, they are thirsty beasts, how someone could dub them HE (High Efficiency) I don`t know.
Thanks for the advise, the cooling system is quite hardcore but I`ll take some additional Fans to be on the safe side. Regarding the CATS, its this
region that particularly concerns me with the proximity of the bodywork..... I don`t want a repeat of the Le Mans incident.
and hopefully it will look nice too 
...Stuart
[Edited on 19/6/11 by StuartBJ]
looked into ceramic coating? as gold and amg powerplant isnt an issue, maybe ceramic coating would be in your budget?
quote:
Originally posted by SeanStone
looked into ceramic coating? as gold and amg powerplant isnt an issue, maybe ceramic coating would be in your budget?
my last mny had camcoat on the exhaust headers, it didnt make any difference i dont think!
The CBS aluminium coated fibre stuff works out as pretty good value. Get the double sided adhesive from them too and follow the instructions. It can
look quite nice.
I have my exhaust running in a sidepod using it and the fibreglass doesn't get too hot, and I recently put some on the underside of my bonnet.
Above my turbo I have an additional (2mm aluminium) heat shield bolted to the manifold. This seems to be similar to the practice used in tin-tops.
I remember reading somewhere about spraying the inside of manifolds with VHT paint, but I can't find the reference. It probably shags the cat or
lamba with the chemicals though.
Matt
Air flow through the engine bay is very important, latent heat build up etc.
I use ally sheet covered with silver heat reflecting material to protect important ancillaries then help to flow latent heat out of the bay.