turbo oiling requirements?

[tonyz2897]

I'm just wondering if anybody knows what the oiling requirements are for the Garrett t03? By this I mean what is the minimum oil pressure it could see without reducing it's lifespan? Also, what kind of volume does it require to hold that pressure under normal operation? I've got an idea for a wierd (non TD related) project that involves using an electric pump and seperate oil tank for turbo lubrication and I'm trying to decide what to look for in a pump.
Thanks,
Tony

[Geoff]

are you making a jet . Remember that the turbo doesnt need or want pressure, just a steady flow of oil...i belive its suposed to be like .25 galons a minute...not a lot.

[xrattiracer]

it does need pressure, and its even not that hard to calculate what pressure it needs. the bearing that is most dependant on it is the thrust bearing since as its name implies is there to deal with the axial thrust created by compressing the air (the compressor wheel is a propeller, it wants to move forward through the housing). By measuring the surface area of this bearing, and knowing what kind of thrust loads you will have (the calculations I have seen use the boost value), you can calculate what kind of pressure you need.
The main bearings will also see slight radial thrust loads, but they are significantly less than what the thrust bearing has to deal with so its not worth making a calculation for them.

[tonyz2897]

Thanks guys. The whole point of this is is to be able to mount a turbo in a situation where it would be too low for the oil to gravity return to the pan. I figured a seperate oil system with an electric pump could be left on long enough for the turbo to cool after the engine was shut down so there wouldn't be any problem with the oil left in the turbo burning up.
Thanks,
Tony