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One anxiety I have about IMSB oil-feed systems is the very,very small size of the oil feed hole in the IMS cover plate.Very easy for a tiny amount of debris/sealer to completely plug that hole. But the same issue/size afflicts the piston squirters .
Asfaik, the oil hole size in the DOF was reduced during development to get the correct volume of oil to the IMS. An oil 'bath' for the IMSB might be better but is not(yet) available. The other(expensive) alternative is a plain bearing IMS retrofit.
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2001 Boxster S
Engineers muse
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