Precision Oil Restrictor (-4AN) for Garrett Ball Bearing ...
2020-4-22 · Precision claims the oiling hole in the cage pin acts as enough of a restrictor that you do not need to double-stack a restrictor in the line as you may with a Garrett GT unit; they also want the turbo to pass more oil to suppress heat in the cartridge due to the lack of coolant ports on the outer bearing housing. ^ Garrett left, Precision right.
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