New Project - Skunkwerks EM9D

Banned

3,628

07-30-2010, 06:45 PM #253

This from Garrett's Website:

Oil Supply & Drainage

Journal Bearing Turbo
Journal-bearings function similarly to rod or crank bearings in an engine - oil pressure is required to keep components separated. An oil restrictor is generally not needed except for oil-pressure-induced leakage. The recommended oil feed for journal bearing turbochargers is -4AN or hose/tubing with an ID of approximately 0.25.
Be sure to use an oil filter that meets or exceeds the OEM specifications.

Ball Bearing Turbo
An oil restrictor is recommended for optimal performance with ball bearing turbochargers. Oil pressure of 40 - 45 psi at maximum engine speed is recommended to prevent damage to the turbocharger's internals. In order to achieve this pressure, a restrictor with a 0.040' (1mm) orifice will normally suffice, but you should always verify the oil pressure entering the turbo after the restrictor in insure that the components are functioning properly.
Recommended oil feed is -3AN or -4AN line or hose/tubing with a similar ID. As always, use an oil filter that meets or exceeds the OEM specifications.

OIL LEAKAGE SHOULD NOT OCCUR ON A PROPERLY FUNCTIONING
SYSTEM IF RESTRICTOR IS NOT USED UNLESS THE SYSTEM
PRESSURE IS EXCESSIVELY HIGH.
Oil Drain
In general, the larger the oil drain, the better. However, a -10AN is typically sufficient
for proper oil drainage, but try not to have an inner diameter smaller than the drain hole
in the housing as this will likely cause the oil to back up in the center housing. Speaking
of oil backing up in the center housing, a gravity feed needs to be just that! The oil
outlet should follow the direction of gravity +/-35° when installed in the vehicle on level
ground. If a gravity feed is not possible, a scavenge pump should be used to insure that
oil flows freely away from the center housing.
Avoid:
 Undulations in the line or extended lengths parallel to the ground
 Draining into oil pan below oil level
 Dead heading into a component behind the oil pan
 Area behind the oil pan (windage tray window) where oil sling occurs from crankshaft

When installing your turbocharger, insure that the turbocharger axis of rotation is parallel
to the level ground within +/- 15°. This means that the oil inlet/outlet should be within
15° of being perpendicular to level ground.

Oil pressure is 107psi at cold start and above 3500rpm hot.

This post was last modified: 07-30-2010, 06:47 PM by ForcedInduction.