Paul...  A water cooled housing is also doable. The split intake is there to
prevent power pulses fromm the engine from intefering with each other and if
not wanted, can certainly be dropped out. I would use an external wastegate
with this set up.

The single housing would make the waste gate implementation easier IMHO
and as Jeff said dual inlets probably would have questionable advantages
in a high power aircraft application. I also think they weigh a bit
more. 

Water cooled bearing housing is a good idea but a ball
bearing turbo  is a waste of money. We can all talk of the merits of having
ball bearings on board but for the aircraft applicationit is a waste.  The
discussoin about bearings in a turbo was a good one especially about "coking
from no cool down".  Another BIG problem is the "debris " in the oil which
KILLS the bearings. Both "coking" and its "debris and engine recirculated
"debris "  sum together to eat up the bearings. It is interesting to look at
the size of turbo bearings......DESIGNED to fail.  We have modified the
bearing to a much bigger one piece set up and have been able to drop the
failure rate considerably.  Let me know what you want in the turbo.     JIM
DANA

The big thing is the Inconel wheel. I think that is essential for a turbo for 
an aircraft rotary. Can that be provided. 

Also do you sell external waste gates? Which do you recommend and how much money?

It is probably a good idea to change the oil more often in a turbo
engine. Also synthetic oil has demonstrated much better resistance to
temperature break down than ordinary motor oil.

Also Exxon has a new Turbine oil out called 2197. Heard anything about 
that Mark Wrathall?

Paul Lamar
 
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