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Thread: Polished Crank

  1. #1

    Polished Crank

    If a steel crank has been polished to a "10-10" just what exactly does that mean? :?:

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Jan 2004
    central Illinois

    Polished crank

    It means sombody spent more money on sandpaper than the crank was worth.
    Seriously, the crank would be ground .010" undersize, which is the way it is reconditioned when it is no longer usable at standard size. It would then be micro polished with sandpaper or crocus cloth to give it a smooth surface. Trying to polish to a smaller size will result in an out of round shape and unequal bearing clearance.

  3. #3
    Senior Member RACING JUNKIE curtisreed's Avatar
    Join Date
    Feb 2004
    It means the rod journals and the main journals both have been turned .010" of an inch undersized. I hope they turned them and then polished it out.


    Dang it got treed on that one.

  4. #4
    Got it, thanks.

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