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aron

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Registered: 10th May 07
Location: Ware, Hertfordshire
User status: Offline

6th Dec 10 at 10:51

i've heard stories of stainless manifolds cracking, will using heat wrap make it better or worse?

i bought some heat wrap (to protect the new paint in my engine bay as well as any performance benefits), but if it's not a good idea i'll leave if off

the manifold is a milltek if that makes any difference

any advice would be great, thanks

Minty_Fresh

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Registered: 1st May 08
Location: westmidlands
User status: Offline

6th Dec 10 at 10:53

i heard about this also, but i went for the heat wrap and it never caused it to crack..

lowered the engine bay temps a treat (aswell as bonnet raisers)

Member

Registered: 10th Sep 03
User status: Offline

6th Dec 10 at 11:08

I've been wondering about these cracking stories. Has anyone actually had this happen themselves? I'd have thought shock cooling would cause failure rather than higher heat.

big eck

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Registered: 20th Apr 03
Location: Tullibody. Drives - Audi B8 S4 & Fiesta Zetec-S
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6th Dec 10 at 11:08

Heat wrap is great stuff mate. Keeps the temps under the bonnet at a minimum. It helps gas flow as well afaik.

big eck

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Registered: 20th Apr 03
Location: Tullibody. Drives - Audi B8 S4 & Fiesta Zetec-S
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6th Dec 10 at 11:09

Your miltek will have a lifetime guarantee as well as long as your the original buyer.

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
User status: Offline

6th Dec 10 at 11:21

As long as it's been made to a decent standard a stainless manifold should hold up for as long as you want.

I'd say these stories of cracking manifolds stems from shite welding/ manufacture.

[Edited on 06-12-2010 by alan-g-w]

Corsa_Sport21

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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
User status: Offline

6th Dec 10 at 11:25

Dont you have to apply heatwrap wet??

If so thats probably what will cause the cracking.The water will soak in.

Wont happen instant but it will over time.

Col004

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Registered: 25th Jun 03
User status: Offline

6th Dec 10 at 11:35

Apply it wet and let it dry.. the manifold wont crack unless its got a crap weld or its cheap stainless. Then were back to the good old saying of buy cheap buy twice

[Edited on 06-12-2010 by Col004]

Gary

Premium Member

Registered: 22nd Nov 06
Location: West Yorkshire
User status: Offline

6th Dec 10 at 11:37

Water will soak in where?

It'll dry off within a few mins of the manifold heating up.

I'm with alan-gee-doubleyou, shouldn't fail unless it's crap quality stuff.

Corsa_Sport21

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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
User status: Offline

6th Dec 10 at 11:42

I was always under the impression that the water and moisture would cause the manifold to rust and crack.

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
User status: Offline

6th Dec 10 at 11:43

Water soaking into metal

no chance, you might find that if the metal/ welds are porous then water could enter the little 'bubbles' and when it heats up could maybe case it to crack. But porous material would come down to poor welding/ manufacture.

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
User status: Offline

6th Dec 10 at 11:43

Stainless doesn't rust mate.

Corsa_Sport21

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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
User status: Offline

6th Dec 10 at 11:48

Could have swore ive seen S/S exhaust with rust on them.

R Lee

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Registered: 15th Aug 03
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6th Dec 10 at 11:50

As far as I'm aware, cracking happens when the heat wrapping hasn't been applied properly to the exhaust.
It must cover every last bit of exposed metal otherwise the excess heat will find the most direct route of escape, therefore causing that particular bit to heat up and crack.
Its normally applied wet because its easier to manipulate around bends and it keeps the fibres from going everywhere.

Col004

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Registered: 25th Jun 03
User status: Offline

6th Dec 10 at 11:51

its not rust matey.. stainless goes a browny colour when heat has gone through it. the only way you have seen rust around a stanless manifold is if the flange is mild steel and that will rust. or the whole manifold could of been mild steel

R Lee

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Registered: 15th Aug 03
User status: Offline

6th Dec 10 at 11:51

quote:
Originally posted by alan-g-w
Stainless doesn't rust mate.

Different grades of stainless. Shit quality will have surface rust.

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
User status: Offline

6th Dec 10 at 11:52

It can rust on the surface but it's something to do with the iron sitting on the outside rusting, the actual metal itself doesn't.

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
User status: Offline

6th Dec 10 at 11:54

As you say Mr Lee

Member

Registered: 10th Sep 03
User status: Offline

6th Dec 10 at 12:57

quote:
Originally posted by alan-g-w
Water soaking into metal

Read the thread title. You might make a fool out of yourself otherwise...

Wrighty

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Registered: 28th Feb 04
Location: Howden
User status: Offline

6th Dec 10 at 13:01

buy DEI heatwrap, the cheapstuff is pap. DEI has compound init that comes out once you dampen it with a trigger spray full of water. get 2 people on the job, keep it tight like a tiger and buy some lock wire pliers. once dry the compound helps keep the heat in and locks the heatwrap to the metal. it will create a bit of steam the first time it gets hot.

[Edited on 06-12-2010 by Wrighty]

alan-g-w

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Registered: 9th Nov 07
Location: Glasgow
User status: Offline

6th Dec 10 at 13:16

quote:
Originally posted by ed

quote:
Originally posted by alan-g-w
Water soaking into metal

Read the thread title. You might make a fool out of yourself otherwise...

What's your point?

ianofbhills

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Registered: 10th Feb 01
Location: newcastle
User status: Offline

6th Dec 10 at 13:22

Yep that water that soaks into that stainless steel that runs at several hundred degrees is a right nightmare.

KyleCorsa

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Registered: 6th Jan 09
Location: Wrexham (North Wales)
User status: Offline

6th Dec 10 at 13:36

I would heatwrap it mate. Mines stainless and heatwrapped on my X16XE and its fine mate.

aron

Member

Registered: 10th May 07
Location: Ware, Hertfordshire
User status: Offline

6th Dec 10 at 14:02

i bought the milltek brand spankers from TSR and when i phoned this morning they said that wrapping it would invalidate the warranty... but that he'd never had one crack wrapped OR unwrapped. if it does crack, it will be around the welds and that wouldn't be a difficult fix if it were to happen

i think i'll take my chances and wrap it to protect my new red paint, if it was worth getting it ceramic coated i would go down that route, but it's not a full on show car nor is it a race car so i can't justify the cost of ceramic coat

think i'll need a fair amount to cover my 4 branch;

Member

Registered: 10th Sep 03
User status: Offline

6th Dec 10 at 14:37

A Zircatec coating is as effective, if not better, than heat wrap. Certainly isn't just for show!

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