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|3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.|
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Thanks for your reply!
I am assuming, and correct me if I'm wrong, that you can have the journals turned down to whatever diameter you please.
It may well be that there is an optimal oil clearance for minimizing wear and that it may be somewhere in the factory tolerance range. But why not start at an acceptable clearance smaller than it ?
Thanks again for your reply.
+1 Leave the crankshaft journals alone. ~~~
~~~ I have seen engines built "tight" that were incapable of being cranked by the starter alone (i.e. had to be clutch started with starter assistance) and in spite of this, did not achieve any significant benefit in terms of either performance or engine life.
Remember that internal friction is directly proportional to how tight a fit you achieve between running components and that higher friction = more heat generation and greater wear.
Take into account also that the crankshaft is both pressure and splash lubricated (unless you are runnng a dry sump), so I would be very happy with the clearances you can achieve running the available bearing shells.
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