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NorthernMonkey NorthernMonkey is offline
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Default N54 Aftermarket Piston Rings - 10-17-2020, 12:24 AM

Does anybody understand the differences in piston ring depths and is there a difference between N54B30 and N54B30A.

My UK 2008 135i is an N54B30A
BMW come back with the part number 11257577586 for the ring set.

SM Motorenteile 790742 00 6 aftermarket have a compression ring height of 1.5mm

I have measured my existing compression ring heights at 1.46mm
And the ring slot at 1.52mm

Iím not sure the 1.5mm ring will be OK, is 0.02mm of clearance enough?

Has anybody else been through this?
Thanks
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