Who had practical experience on leaving the turbo heat shield off?

**bob10** · 15th February 2016, 11:47 AM

Originally Posted by discorevy

To answer your questions , it appears to be made of a double layer of reflective alloyed metal filled with some type of powdered ceramic.
Yes it will transfer heat ... as I said earlier , its not perfect but better than nothing. And to think of all the heat shielding on all the modern stuff these days , those silly car companies must love wasting money on all that unnecessary heat deflection

Had a close look at my shield, did the grinder spark test, looks like it is pressed mild steel. Could not find any ceramic at all. Mine is a 1999 D2, though. I do have to question the thinking behind placing a heater hose under the shield. [ secret hose]

**discorevy** · 15th February 2016, 04:13 PM

Prised one apart a couple of months ago , was full of a powdery white substance I assumed to be some sort of ceramic ( unless it was a Columbian import

. Also was thinking it to be made of an alloyed steel as I've not seen a rusty one yet ( any metallurgist's ? )
Cheers

**Disco Muppet** · 15th February 2016, 05:18 PM

As posted in the other thread.
It's great for seeing coolant leaks from Welch plugs and the hidden heater hose, but I have a low coolant alarm so I'm not as fussed.
Mine only caused an issue with the aux battery next to it after I took it off, so it's going back on.

Sent from my HTC One using AULRO mobile app

**vnx205** · 15th February 2016, 05:34 PM

Originally Posted by bob10

Think about that for a minute. What is the heat shield made of? Do you think it may transfer heat ?. I'll leave it at that.

This graph:

and this statement:
The radiation energy per unit time from a blackbody is proportional to the fourth power of the absolute temperature (My emphasis)
should help explain why a shield helps more than you might think.

Radiation Heat Transfer

Even though the calculation for the amount of radiated heat refers to absolute temperature, a small drop in temperature makes a big difference to the radiated heat.

The shield only needs to be a few degrees cooler than the body of the turbo to make a worthwhile difference.

**bob10** · 15th February 2016, 06:51 PM

Originally Posted by vnx205

This graph:

and this statement:
The radiation energy per unit time from a blackbody is proportional to the fourth power of the absolute temperature (My emphasis)
should help explain why a shield helps more than you might think.

Radiation Heat Transfer

Even though the calculation for the amount of radiated heat refers to absolute temperature, a small drop in temperature makes a big difference to the radiated heat.

The shield only needs to be a few degrees cooler than the body of the turbo to make a worthwhile difference.

I'm afraid this very impressive graph, and the equally impressive formula, although well presented, will not convince me that the heat shield, with it's superfluous hand in the stop position, with bar, is not the invention of the L.R. companies O.H.&S. boffins, protecting the great unwashed from themselves. In three years, with plenty of sand driving, and high engine temps. I have yet to see any adverse effect of the shield removal. That doesn't mean I could not be convinced otherwise.

**onebob** · 15th February 2016, 07:15 PM

My heat shield and acoustic cover have been off for 2 years at least and i can report that I've had no adverse effects.

onebob

**ramblingboy42** · 15th February 2016, 07:33 PM

...for all the banter about the heat shield , I think it's sole purpose is to stop the owner or who ever is fiddling around under the hood from getting 3rd degree burns off the exposed turbocharger.

schuy1 · 15th February 2016, 07:54 PM

I am assuming the sheild is made of 'Aluminised' steel, or to be more apt the same stuff most exhaust pipe are made of. If you scratch the surface it will rust. The white powder inside may be asbestos!! Not sure when it was banned from western cars?
Cheers Scott

**discorevy** · 15th February 2016, 09:08 PM

Asbestos was banned in UK 1999 Australia 2003 , have a bit of an interest in this , as when I started my apprenticeship in the early 80's, I was taught to clean brakes by blowing them out with compressed air

was only 16 so didn't know any better .......
The powder was very granulated so don't think it was that

**PhilipA** · 16th February 2016, 09:10 AM

I think it is stainless steel, as it polishes up well with stainless polish and has a cavity filled with something.
Stainless will rust a bit depending on its makeup.

I also read the emmissivity of various materials a couple of days ago , and a polished surface such as stainless is 0.1.

I have an additional stainless barrier between my battery and turbo heat shield covered in bright aluminium tape and a battery blanket around the battery as well. So far so good..

I cannot see why you would want to delete the heat shield as it just sits there looking pretty and maybe if you drive on sand it would slow down sand getting into the wastegate pivot. I used to have constant trouble with a Charade turbo with the wastegate pivot jamming from salty air.

I have modified mine to make it easier to remove and replace by moving the back bolt from the turbo to the bracket where it joins the heat shield, or rather by adding a rivnut to the bracket so that you don't have to have all the stars aligned to do up the bolt on the turbo.
But maybe I am a bit anal.

Regards Philip A

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