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Cool under the bonnet

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Drift:
As a thought could it be beneficial to wrap the pipes in metal heat reflective foil ?

I half half heartedly tried this on my modifide air intake, but didnt do a great job as you may see in the pic, it all fell off  :oops:

winchman:
This may have some effect on performance as there will be an optimum exhaust temp, but you need some one better than me to advise you.
I have seen it on race cars though.

waveydavey:
I would be stunned if it made an appreciable difference.
Once at speed (any speed) the airflow will bring the exhaust heat down under the car; the cooled air after the intercooler is at the top and quite honestly the air flow through the manifold is high enough that even if the metal is hot it would hardly make a difference. That is why you need a cooling matrix for the intercooler.

Try sticking a thermometer under the bonnet and have a look at the temperature as soon as you stop.

carbore:
Having spent a lot of time playing whit track/race cars and talking to my mates who do the same.....

My Elise has lagged exhaust manifold.
This is due to the fact that there is little air movement in the Engine bay (Mid Engine/Undertray) and the exhaust manifold is very close to alternator, petrol tank and other such things.  Therefore removing the radiant heat that goes out is desirable.

I Use "socks" that are a loose fit over the manifold.
http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=MSPORT&pcode=NIM11246

No cheap but my Elise is a bit of a monster!

I did consider using exhaust wrap, however my friends who tried it say that it is prone to cracking exhausts due to expansion.  It ok on a straight section, but if there are any welds an joins then its a bit iffy.


Re inlet hoses.
I use silicone reflective hose for the air to filter hose. Again expensive but it reduces inlet temps resonably well by all accounts.
http://www.demon-tweeks.co.uk/products/ProductDetail.asp?cls=MSPORT&pcode=SFSSFD31-1

I have also put heat reflective tape all over the filter housing and manifold.  This also reduces temp especially when sitting around. This was £5 for a reel of ebay! and I tested it with a IR thermometer by the fire and it works well!
http://cgi.ebay.co.uk/Thermo-Shield-Heat-Wrap-Self-Adhesive-Tape-1-5-x-15_W0QQitemZ130176606001QQihZ003QQcategoryZ38786QQssPageNameZWDVWQQrdZ1QQcmdZViewItem


People spend A LOT of money on this for racing cars as it does make a difference, however its really the icing on the cake, its not difficult so its tempting to do for a weekend job, but things like bigger intercoolers make performers jumps not little steps that heat management does.

The one thing im not sure about is what happens to this stuff when it gets wet! if its not done by other 4x4 competition vehicles then there  is a good reason and is suspect that its to do with water/mud ??

bilge rat:
that takes me bavk used to work on lotus , doing upgrades to track spec 190 upgrades and the like . miss it , infact my little girl i named elise !. any way back to the disco ,i put a bit of heatproof material between the manifolds,  did rap some round the top intercooler hose as a trial but to be honest didnt notice a great deal of difference. as for exhaust not so much heat but reduce back pressure slightly i would say would be more worth while, replace the centre box with a straight through . think paddoks do them . or even remove the tail pipe although this does not do much anyway. have you tweeked the pump, you can boost the turbo pressure on the 200 slightly. freeflow filter , plenty to go at. alan......

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