Doug,
Had a long talk with my friend at Garret now Honeywell and
he gave me a few tips. Make sure you use a ceramic ball bearing turbo

charger

and don't put any side load on the shaft itself. The biggest problem
they have is the whirl vibration mode of the shaft. The ceramic ball

bearing

shaft systems are much stiffer and that problem goes away more or

less.

He also confirmed the TO4 or the even larger T45 would be the right
starting point.

He also gave me some contacts to get some turbine maps of flow verses
efficiency
and pressure ratio for existing products. The A/R to use for a given
radius is not necessarily the highest. Turbine blade angle is
varied to optimize it for flow and pressure ratio. One turbine design
is used with a wide range or A/R housings to adjust the turbo charger

for

a given engine configuration. Therefore a change in the A/R makes

small single

digit changes in the efficiency.

Paul Lamar

Paul,

I would be VERY interested in seeing these turbine maps. If you can find
them for existing compressor wheels, that would be good too. I have searched
in vain for this info. If it has part numbers that would make things way too
easy.

Monty

 
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