| I have a dilemma with turbos smoking. I want to get some feedbacks and thoughts on this. I had my engine rebuilt (well basically I put in new crank and rod bearings and new rings last winter). Nothing else. The oil pressure shoots up to 100psi on cold start/idle. Drops down 45psi on warm idle (used to be 25psi before the rebuild). So at 4-5000 rpm on boost, it's over 100psi again. So this is apparently causing the turbos to smoke. Checked the turbo shafts, there is no play. I have -4 AN feed lines with 1/16 restrictors and inline fuel filters (40 micron). The drain size is 13mm (about 1/2 inch). And the drain hose has almost 90 degree bend to route to the oil pan. Nothing I can do about the bend. I called the turbo company. They basically said the high oil pressure and the -4 AN feed lines and the bends in the drain backs. The drain is gravity drain. The turbine foams up the oil and the -4 AN feeds too much oil into the oil than its ability to drain out. So the restrictors need be moved to the block and the lines should be changed to -3 AN. The drain lines should be as vertical as possible with no bends. I found an oil sandwich adapter that has 24psi pressure relief valve. I wonder what impact it would have on the engine. Also anyone has this high of oil pressure and smoking problems? I just want to bounce some ideas off you guys.
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