High Temp Coatings in a Turbo

[lkurek at smtpgate.anl.gov]

     Seems to me you guys are only looking at one side of this coin. There 
     are also coatings available that are called "Heat Rejection Coatings", 
     which actually enhance thermal transfer between the substrate and the 
     cooling medium. I would think a coating of this on the outside of the 
     turbo housing, along with a "light" coat of barrier coating on the 
     inside (.0005-.001") would be the ticket for preventing heat transfer 
     into the housing, and then rejecting the heat that does get in easier. 
     BTW, I would think if you could apply it evenly, a light coat of TBC 
     on the turbine would get rid of any problems caused by changing the 
     expansion characteristics of one part and not the other (may also help 
     to keep heat out of the bearings).
     
     TTYL!
     
     Larry Kurek


______________________________ Reply Separator _________________________________
Subject: Re: High Temp Coatings in a Turbo
Author:  <diy_efi at efi332.eng.ohio-state.edu> at internet
Date:    4/2/98 1:17 PM


> 
> > > >Would this stuff work on the turbine housing of a turbo?  Seems like
> > > >it would if it works on headers, but I've seen pictures with the turbine 
> > > >red hot while I've never seen headers glow quite so brightly.  What is
> > > >the temp limit for these coatings? 
> > >
> > > Please, either don't do this, or be very, very careful if you coat the 
> > > inside housing of your turbo.  A friend and I had done just that in an 
> > 
> > Good advice.  I was talking about the outside of the turbo though.  I was 
> > just wondering if the coating could take the heat.  Do turbine housings
> > really get hotter than a strait header would?  Seems like they would if
> > you were always running boost, but for the average street goer that wouldn't
> > be a problem.
> > 
> Outside coating only would "likely" result in severe overheating, and 
> possible melt-down. A bit like wrapped headers?
     
     
I would think may benefit would be from coating the exhauset side of the 
turbine unit and the inside of the exhaust scroll
     
this would really help keep heat out od the turbo housing and bearing, and 
put it into the gasses where it belongs
should also reduce tendency to turbo lag
     
Clive 
     
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