BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > N55 bore and hone 0.5mm possible?
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      06-07-2021, 12:35 AM   #1
lukevl
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Drives: F20 M135
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N55 bore and hone 0.5mm possible?

Hi new to the forum, tried to search but no luck. I have an M135 with an N55 thats had some water damage in a bore. It looks like it won't quite clean up with a hone and wondering if 0.5mm bore and hone is acceptable on these? The casted-in iron liners measure 3.0mm thick at the top, maybe a little less at the bottom and some piston companies like Mahle and JE make 0.5mm oversize units.

Is it deemed doable and has anyone done it? Not chasing mega power. Thanks
Appreciate 0
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