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Problem Solved:
Sure enouigh, the 9mm steel ball in the oil feed line (at pressure switch) was missing . Once I installed one, the smoking stopped.
It's interesting that the stock setup did not smoke with the ball missing. Since the volumes of the stock and custom drip tanks are about the same, I figure the oil must have been backing up in the stock vent tube. This was just enough extra volume to keep it from backing up into the turbo.
Note: If you don't want to wait to special order the 9mm ball, Lowes Hardware sells a 3/8 inch steel ball bearing - works great and allows sufficient oil flow (3/8inch=9.52mm).
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Steve
'79 930 US
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