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Thread: To rebore or not to rebore?

  1. 19th March 2022, 08:59 PM #11
    johnp38
    johnp38 is offline Master Supporter
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    Quote Originally Posted by 350RRC View Post
    Just curious..............

    In those specs where do they mention oversize of 20 thou (assuming 'of an inch')?

    DL
    The oversize ones are just under .5 mm larger, it's all metric, just read the bore size in the specs .
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  2. 19th March 2022, 10:42 PM #12
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    V8Ian
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    1/20,000" is a standard rebore increment.
    If you don't like trucks, stop buying stuff.
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  3. 20th March 2022, 06:07 AM #13
    biggin
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    Or 20/1000”, maybe?
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  4. 20th March 2022, 10:58 AM #14
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    Quote Originally Posted by biggin View Post
    Or 20/1000”, maybe?
    It was late.
    If you don't like trucks, stop buying stuff.
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  5. 20th March 2022, 01:19 PM #15
    SMXT
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    The standard bore is 84.45mm. So the Nural pistons to suit a 84.95 bore or +0.5mm (87-140007-00) and the KS pistons to suit a 84.942 bore or +0.492mm (99418610) are the oversize parts.

    I have found them online commonly referred to as +50 oversize.

    0.5mm is equal to 19.68503937 (mil , thou) and 0.0197 of an inch so yes you would be correct on the basis of rounding up.

    I ended up buying the KS +50 pistons from Turners Engineering as they had stock and an apparently good price. I spoke with the Australian importer and they mentioned that KolbenSchmidt in Germany were out of stock till the end of the month (March 22).
    Last edited by SMXT; 20th March 2022 at 01:20 PM. Reason: add word
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