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SVM 286	posted on 26th Sep 05 at 22:02
	quote: Originally posted by SetH quote: Originally posted by white_sri you use it on your exhaust manifold to insulate the heat so it doesnt escape into the engine bay, this helps especially if you dont have a sealed induction kit. i wouldnt recommend doing it though as it can sometimes cause the manifolds to crack. i would recommend you use a heat shield of somekind instead Please elaborate on why heat wrapping a manifold may cause it to crack? The wrapping causes the inside of the area that is covered to become super-heated because there is no longer the external surface area to dissipate heat. The effect of superheating the steel changes the structure of the material at a molecular level by concentrating the carbon content and making the metal brittle, and therefore, far more vulnerable to cracking from stress, vibration or impact. :(
James R	posted on 24th Sep 05 at 13:12
	quote: Originally posted by SetH 100`s of scooby owners have aftermarket wrapped manifolds, not heard of that happening before. Pics if you have them. The wrap causes the metal to get baked, as it can't dump the heat out of it. I'll put it like this, Ahely exhausts have cars running their manifodl and race system, and they are 13years old, and only ever needed new centre sections because the sound deadening gets cooked, but the manifolds are still as factory. They've had ppl send them back after one weekends rally event due to bits of them melting from the heat, and it's because they're been wrapped. Infact the best trreatment for the exhaust is an aliminised finished to help disipate heat faster, then shield the bits of the car you don't want to get hot from the exhaust. Ring ashely and chat to Brian about if you want to find out. James;)
langey	posted on 24th Sep 05 at 12:58
	quote: Originally posted by SetH i see. 100`s of scooby owners have aftermarket wrapped manifolds, not heard of that happening before. must just happen to shitty corsa ones then. well it wouldnt be the shitty corsa as the mainfold wasnt off a corsa was it? :boggle:
Ian	posted on 24th Sep 05 at 12:51
	I've seen it happen to all types of car, the metal doesn't know what its getting bolted to :rolleyes:
SetH	posted on 24th Sep 05 at 11:41
	i see. 100`s of scooby owners have aftermarket wrapped manifolds, not heard of that happening before. must just happen to shitty corsa ones then.
broster	posted on 24th Sep 05 at 11:38
	it does because it keeps the heat in and small movements in the exhaust system are then able to crack the heat weakened welds....
white_sri	posted on 24th Sep 05 at 11:29
	quote: Originally posted by SetH quote: Originally posted by white_sri you use it on your exhaust manifold to insulate the heat so it doesnt escape into the engine bay, this helps especially if you dont have a sealed induction kit. i wouldnt recommend doing it though as it can sometimes cause the manifolds to crack. i would recommend you use a heat shield of somekind instead Please elaborate on why heat wrapping a manifold may cause it to crack? i dont know why it does it but ive heard of people using the exhaust wrap stuff and then it causes the manifold to crack
SetH	posted on 24th Sep 05 at 11:12
	quote: Originally posted by white_sri you use it on your exhaust manifold to insulate the heat so it doesnt escape into the engine bay, this helps especially if you dont have a sealed induction kit. i wouldnt recommend doing it though as it can sometimes cause the manifolds to crack. i would recommend you use a heat shield of somekind instead Please elaborate on why heat wrapping a manifold may cause it to crack?
jr	posted on 24th Sep 05 at 08:50
	i personaly wouldnt use it
iceman	posted on 24th Sep 05 at 08:26
	its exhaust wrap matey it helps disperse the exhaust heat down through the pipes more efficiently give a cool engine bay http://www.proven-products.co.uk/products/cooltek.htm
white_sri	posted on 24th Sep 05 at 08:16
	you use it on your exhaust manifold to insulate the heat so it doesnt escape into the engine bay, this helps especially if you dont have a sealed induction kit. i wouldnt recommend doing it though as it can sometimes cause the manifolds to crack. i would recommend you use a heat shield of somekind instead
Twiggy	posted on 24th Sep 05 at 04:43
	somethink to do with getting rid of the heat... so engine bay temp is lower???:o:wave:
mossy	posted on 24th Sep 05 at 04:14
	dunno what it is but its on icemans old corsa looks like his exhaust manifold? 4 branch thingy at front bottom of engine...ne way looks like this is wrapped in summat? just wondered why this was,what its wrapped in and benefits/reasons? :thumbs::boggle: