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kenikh kenikh is offline
3 restos WIP = psycho
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Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,739
Originally Posted by Jim2 View Post
This is exactly the kind of thing I was thinking, especially sicne the turbo is located behind the engine so the gravity drain effect would be working against acceleration. I also plan of trying a ball bearing turbo on this project since they don't require oil gally pressure to sustain bearing float, apparently you can orfice them down significantly without damage.
Remember that while accelerating, the oil coming into the turbo is pressurized and that liquids don't compress. As long as you are running rigid lines, the oil is not at risk of backing up, as the turbo actively has its oil evacuated by the incoming flow. Gravity drain only matter when the car is not running, thus why the factory added the tank...since the scavenge pump isn't running when the car is off, it gives the remaining oil in the turbo at shutdown a place to go. Even the scavenge pump motors need to utilize gravity to pull oil out of the turbo when not running.

- 1965 911
- 1969 911S
- 1980 911SC Targa
- 1979 930

Last edited by kenikh; 05-07-2010 at 02:15 PM..
Old 05-07-2010, 01:07 PM
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