... going on from peedyxjs' query about master above the exhaust,
those of you have have put wrap on the headers, can you grab the exhaust by hand when engine is up to temp?

or have any measuremnts - not manufacturer's wishful thinking data - of temp. before and after?

just curious.

anyone who has grabbed a hot exhaust wrapped or not deserves an attempted Darwin award

It makes a considerable difference IMHO. I can touch my wrapped exhaust sections, but the unwrapped sections are hotter than the surface of the sun (hence all my trousers have burn holes in at exhaust height!)!

I have a 3" outlet/down pipe exiting my turbo which is double wrapped, when in the eveing and driven 'hard' you can see the turbo has a orange glow to it. But you could 'tap' the wrapped downpipe and not get burned-good stuff i think

Yeah, i dont think you would want to hold the back of you hand in it for hours. Seconds even. But for the occasional brush when spannering in the area with a hot exhaust you get an 'Oo, thats warm, i'll move my hand' feeling rather than a 'Fk Sht Ase ive just lost half the skin on my hand' while removing the rest by recoiling so fast, sort of feeling.

Ive got a roll of the ceramic stuff of ebay too, not fitted it yet, but i feels nicerand is thicker than most og the glass stuff.

Daniel

you can hold ceramic coated ones apparently after a drive...(?)

quote:

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Originally posted by A1
you can hold ceramic coated ones apparently after a drive...(?)

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Who cares, why would you want to???

The aim of it is to stop raidated heat. It still gets hot though. Just because it doesnt burn, doesnt mean its not hot.

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Originally posted by MakeEverything
Who cares, why would you want to???

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'the idea is to gauge the effectievnss not a propostition for everyone to go and do this'

well said that man

My exhaust wrap still gets bloody hot, but it is nowhere near as hot as touching the unwrapped pipe

When i went for SVA i had some think foil backed lagging around the cat. It was double wrapped around, and you could grab hold of the cat quite easily. worked really well that stuff. i would use it under the bonnet on items to protect, but i wouldnt want it on show wrapped around all of my exhaust that is on show

^^^ yes i know what you mean, unfortunatley most of my exhaust is wrapped at present, but it is some protection for my young girls who insist on helping dad with the car. Unwrapped i momentarly rested my forearm on exhaust whilst building it, i beared the pain untill 4am then off to a&e

We have an exhaust wrap since the manifold is on the same side as the brake master cylinders and quite close. The wrap makes a big difference. But we have also added an aluminium heat shield in front of the master cylinders. This way they stay nice and cool. The other reason for us fitting the wraps was that the footwell was extremely hot in the car. We have blocked airways to the footwell, added the exhaust wrap, the heat shield and it is now nice and cool.
On the outside, if you spit on the unwrapped exhaust tubes after a drive, it sizzles, if you do the same 5 cms from the same spot on the wrap, it just slowly evaporates. I am not keen on testing by grabbing the tubes though...
Gergely



[Edited on 25/9/09 by Gergely]

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Originally posted by t16turbotone
Unwrapped i momentarly rested my forearm on exhaust whilst building it, i beared the pain untill 4am then off to a&e

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I seem to remember that wrapping the exhaust can cause problems with some engines as the temperature of the cylinder head can be much higher, as the heat is not as well dissipated. I stand to be corrected though.

Just something to think about
Regards
Hugh

^^^^ yep, it could be, also you do not wrap cast iron manifolds either.