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  1. #1
    urugol's Avatar
    Join Date
    Nov 2009
    Sydney, Australia

    Boring Measurements for the Pro

    Ok I'm still an apprentice here so I expect I have done something wrong. As any wannabe engine builder I decided to pick up a bore gauge to take some readings, and I am looking at the Pro Cylinders to check the existing clearance as I'm going to be putting in Wisecos. I have one of these digital bore gauges, accurate to 0.001mm but I'm having some difficulty getting correct readings if someone has some experience with these I would appreciate any input.

    So I have taken the 2.6" post with the 0.1" and 0.2" washers to give me a 2.72" post, or 69.088mm. I have then set that as the absolute value for measuring, and found that I am well under the 69.70X that I am looking for (technically it shouldn't fit in the bore).

    What am I doing wrong here? Is it a calibration issue?
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  2. #2
    bowsniper's Avatar
    Join Date
    Aug 2008
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  3. #3
    LaveyT's Avatar
    Join Date
    Jul 2008
    You need to set the gage with a set of O.D. micrometers or a "ring master setting gage" ideally.
    I prefer the anolog gages because I find it easier to determine when I have the gage on the same "plane" as the bore.

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