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Old 07-07-2008, 02:14 PM   #1
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Default turbo blanket (Ur doin it wrong)

How important is it to shield the compressor housing from radiant heat? I have noticed that BEGi uses a heat shield between the manifold and the compressor housing on their higher end kits. Also Corky strongly discourages blankets and/or wraps on hot parts, although many people do use them.

Which lead to an interesting idea... Combining conventional turbine sheet metal heat shielding with a turbo blanket on the compressor side.

Any real world benefit to be had here?
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Old 07-07-2008, 03:18 PM   #2
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there's a device called an "intercooler" which handles this.
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Old 07-07-2008, 03:23 PM   #3
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there's a device called an "intercooler" which handles this.
Go argue about that with Corky, he's already using a heat shield for the compressor. I presume he knows what he's doing. I am just asking about another method of doing the same.
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Old 07-07-2008, 03:24 PM   #4
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Go argue about that with Corky. He's the one shielding the compressor. I am just asking about another method of doing the same.
Pictures.
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Old 07-07-2008, 03:29 PM   #5
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Blankets are designed to keep the heat inside the exhaust housing, why would you want to do the same to the compressor?
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Old 07-07-2008, 03:38 PM   #6
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Pictures.
i think this is what he is referring to.

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Old 07-07-2008, 03:53 PM   #7
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Pictures.
These are both on the Series 5 kit page:





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Originally Posted by Zabac View Post
Blankets are designed to keep the heat inside the exhaust housing, why would you want to do the same to the compressor?
Basic Thermodynamics. Heat flows from hot body to a cold body. The blanket is a poor conductor of thermal energy (heat). It is used to constrain the flow of heat.

You are correct, it's intended application is to hold heat in the turbine. I am asking about an alternate application, keeping radiant heat out of the compressor.
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Old 07-07-2008, 03:54 PM   #8
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I think the entire bay benefits from that, not just the compressor. especially your p/s steering lines if applicable....either way, the theory still stands; block the hot things from radiating onto parts, insulate the parts you wanna keep cool from the heat.
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Old 07-07-2008, 03:59 PM   #9
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Have you ever felt the "cold" side after driving for a bit? It is anything but cold. This is the same priciple that Corky and FM were arguing about when FM put out silicone intercooler piping. They said that it kept heat out. Well, Corky showed that by having metal pipes, the pipes themselves actually got rid of a decent ammount of heat. I noticed this myself when i had just the bell intercooler piping but no intercooler, just a pipe in place. I actually got decent temps (within 35-40*F of ambient.) on 10psi from a gt2860. You dont want to hold the heat from the compressor in, you want to let it out.
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Old 07-07-2008, 04:01 PM   #10
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Originally Posted by Braineack View Post
insulate the parts you wanna keep cool from the heat.
This can be misleading to people and lend them to think that they should insulate their charge pipes.
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Old 07-07-2008, 04:10 PM   #11
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Quote:
Originally Posted by Braineack View Post
... insulate the parts you wanna keep cool from the heat.
Bingo! That's what I am focused on, insulating the compressor
(Sorry to quote you out of context)

Hence my question:
How important is it to shield the compressor housing from radiant heat?

BTW, I agree that putting a blanket on the turbine housing is more effective at reducing underhood temps, BUT Corky has established that under extreme use you can smelt your turbine housing that way.
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Old 07-07-2008, 04:10 PM   #12
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Quote:
Originally Posted by MazDilla View Post
Basic Thermodynamics. Heat flows from hot body to a cold body. The blanket is a poor conductor of thermal energy (heat). It is used to constrain the flow of heat.

You are correct, it's intended application is to hold heat in the turbine. I am asking about an alternate application, keeping radiant heat out of the compressor.
I totaly get what you are saying, I just don't agree that the blanket is what you need there.
The compressor gets hot as hell from the comressed air inside and sheds this heat off into the engine bay. That is part of why the compressor is made out of AL, to shed heat. Yes, you do want to keep heat away from it, but not by wrapping it up with an insulator, which is what the blanket is.
Your biggest heast generators are in approximate order from hottest down:
1. Manifold
2. Exhaust housing
3. Downpipe
4. Motor
5. compressor housing

Solutions known to work that I would like to use:
1. Ceramic coat, and heat shield (ss maybe)
2. Ceramic coat, Turbo blanket, and heat shield
3. Ceramic coat, heat shield
4. Coolant re-route, oil cooler-this will take care of the motor.
5. nothing for radiant heat, but use of intercooler and WI killz your iat's dead!!!
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Old 07-07-2008, 04:10 PM   #13
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well intake pipe, brake ****, etc etc. cold side of IC pipes. let the hotside shed heat before the IC.

regardless, steph is sending me the compressor sheild


I'm not sure wrapping the compressor will help, you wanna wrap the intake pipes and prevent them from heatsoaking, but the compressor causes the heat in the first place, so if anything it will help store the heat....not shed it, and the aluminum housing would be best left alone....imo
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Old 07-07-2008, 04:17 PM   #14
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That's exactly what I mean.
Wrapping things to insuate them from getting hot only makes sense if those things are not hot to begin with.
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Old 07-07-2008, 04:32 PM   #15
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Quote:
Originally Posted by wes65 View Post
Have you ever felt the "cold" side after driving for a bit? It is anything but cold... the pipes themselves actually got rid of a decent ammount of heat... You dont want to hold the heat from the compressor in, you want to let it out.
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That's exactly what I mean.
Wrapping things to insuate them from getting hot only makes sense if those things are not hot to begin with.
Sorry to be such a fly in the ointment here, but there are red hot glowing chunks of iron inches (or less) away from the compressor housing. Any surfaces of the compressor housing facing these are taking on heat from them.

This is additional heat load above and beyond the heat induced by (inefficient) compression.

It seems the most beneficial configuration for using a blanket on the compressor would be to to take a pair of tin snips and trim away the blanket on the sides away from the manifold and turbine. Although I'm pretty sure considering the temp delta and surface area of the exposed surfaces would not shed a significant amount of heat.

Last edited by MazDilla; 07-07-2008 at 04:42 PM.
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Old 07-07-2008, 04:39 PM   #16
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well the idea of the compressor shield for the manifold is to prevent it from radiating onto the compressor and intake. the cooler that area is, the better. but insulating the compressor housing itself might led to increased temps.
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Old 07-07-2008, 04:41 PM   #17
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Quote:
Originally Posted by MazDilla View Post
Sorry to be such a fly in the ointment here, but there are red hot glowing chunks of iron inches (or less) away from the compressor housing. Any surfaces of the compressor housing facing these are taking on heat from them.

This is additional heat load above and beyond the heat induced by (inefficient) compression.

It seems the most beneficial configuration for using a blanket on the compressor would be to to take a pair of tin snips and trim away the blanket on the sides away from the manifold and turbine. Although I'm pretty sure the considering the temp delta and surface area of the exposed surfaces would not shed a significant amount of heat.


This is exactly why you should put a blanket on the hotside.

Keep in mind, the hotside is connected to the cold side via a metal cartridge, some of the heat from the ex will transfer to the compressor regardeless of what you do and the compressor side will be hot, no matter what. You want it to shed as much as possible.

Yeah, if you put a heatshield in place to further isolate the compressor from the radiant heat you are doing the right thing, but wrapping it in any way is not a good idea. You want that metal exposed to the bay which is now cooler due to the blanket on the ex. housing.
Thanks for brining up some valid questions though, if anything this will help the groupbuy get more people in on it because there is a lot of good info here regarding the benefits of the blanket.

So, should I add you to the GB list now?
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Old 07-07-2008, 04:51 PM   #18
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The compressor will get its heat transfer from the turbine housing which it is attached to. I can see that wrapping the turbine housing will reduce radiant heat in the bay, but i fail to see how it would help reduce heat transfer between the two, in fact I would think that wrapping the turbine side would raise turbine temps and some of that would be passed on to the compressor side.
Wrapping the compressor will only contain the heat surely? Better to leave it open to the air to dissipate heat that way, or maybe using ally intercooler piping would help a little in taking heat away from it? Failing that It's time to add fins to the compressor housing & direct some cool airflow over it.
Or improve the cooling effects of the water & oil supply to the turbo.
I vote IC and WI for a simpler yet effective answer to intke temps
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Old 07-07-2008, 04:54 PM   #19
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Quote:
Originally Posted by jim-NA View Post
Or improve the cooling effects of the water & oil supply to the turbo.
I vote IC and WI for a simpler yet effective answer to intke temps


yes, WI FTW


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Old 07-07-2008, 04:59 PM   #20
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Quote:
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So, should I add you to the GB list now?
lolerskates... Waiting on that mandrel bent exhaust GB to get off the ground first
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