High Temp Coatings in a Turbo (Revisit: slightly off topic)

[Robert Humphris]

>For the inside of the manifold and the inside of the turbine scroll housing
>and its inlet and outlet (all cast iron):
>
>  Sand blast and coat with:
>     TLHB    (http://www.deskmedia.com/~techline/cat-3.html)
>       or
>     CBC3    (http://www.deskmedia.com/~techline/cat-2.html)
>       or
>     Black Satin (http://www.deskmedia.com/~techline/cat-1.html)
>       or
>     Cermakrome  (http://www.deskmedia.com/~techline/cat-1.html)
>       or
>     A combination of these (i.e. CBC3 first, buff, then Black Satin)  
>       Any advantage to this?

Do CBC3 first then Black Satin, the advantage is of the cost of the TLHB
as you cannot get it in the small quantities that you can of CBC3.
Black Satin over Cermakrome as it doesn't need to be baked.
>
>
>For the outside of the manifold and turbine housing:

Coat the manifold in CBC3 then Black satin, inside and out, this keeps
the exhaust heat in, which keeps under bonnet temps down, and the heat
moving through to the turbine, where it is used to spin the system up.
This will go some way to reduce lag.

Coat the turbine housing, the metal will have less heat in it as the
internal coating will be blocking a good percentage of any extra heat.
You want to keep under bonnet temps down as much as possible.
>  
>
>For the inside of the scroll housing of the compressor and its inlet and
>outlet:
>
>    DFL-1    (http://www.deskmedia.com/~techline/cat-2.html)
>        Then buff with Scotch Brite before assembly.
>
>    Do you sandblast first?
Oh yes.  I found that spraying this stuff was a nightmare though, so in
the end I used a swadge of foam rubber and wiped the stuff on.  Do only
one coat ( i did two and the second lot came off when I buffed it )
>  
Use 0000 grade wire wool or plastic equivalent ( 3M make them )  Scotch
Brite is used to key surfaces too soft to be blasted.
>
>For the outside of compressor:

Go for CBC2, the ally equivalent to CBC3 will cut down on heat
contamination, and when buffed gives a really wild polished sheen to
ally, looks rather like a chromed alluminium!
>  
> 
>For the turbo shaft and bearings:
>
>  Buff with Scitch Brite then coat with:
>    WSX    (http://www.deskmedia.com/~techline/cat-2.html)
Work that stuff on, oh yes...  I used cotton wool in small balls to buff
it into my valves and guides.
>
>
>
>
>For the turbine and compressor blades and their housings:
>
>  Nothing.  The barrier will likely be thick enough to cause damage
>  due to heat expansion and tight tolerances.
And it will screw up the balance of the turbine
>
>
>
>OR:
>
>Hose the whole thing off with de-greaser, pre-lube with oil, slap it on
>and don't worry about it.
Yea but thats no fun is it?
>
Any more comments?

>Nope, you have all bases covered