We have just installed an oilless turbo charger on this 1970 upgraded ride, It is most likely to be the first Porsche with this kind of Turbocharger, In other vehicles this task can be easier, the radiator can be tapped to acquire a cooling element......antifreeze.....but that does not run in the veins of an air cooled one. Kind of weird to do it this way.
Historically, the use of engine oil to lubricate the floating sleeve and stationary thrust bearings in commercial turbochargers have rise to a number of operational problems. To prevent oil leakage into the compressor and turbine casings, piston ring seals are employed in commercial turbochargers. Since the piston ring seals are not positive contact seals, there is a small leak path around the piston rings and, during certain operating conditions of the engine, i.e. low idle or a vacuum in the air intake system, some oil leakage can occur. Any ail leakage into the turbocharger casings can result in the undesirable emissions in the engine exhaust.
If I may quote our suppliers:
In cold weather, there can be a significant lag in the flow of oil to the turbocharger bearings when the engine is initially started. If the lag is long, the sleeve bearings can fail on startup.
Another problem can occur when an engine is shut down quickly after being operated at high speed and load where the exhaust gas temperature is maximized. Heat transferred into the turbocharger casings can cause residual lube oil in the bearing system to carbonize. This carbonization can build up and eventually cause failure of the bearings.