Thank you for elaborating on the oil pump.
"we blueprint them" hides a litany of misinformation unless one explains what blueprint means and or entails.
If you polish any of the metal in the pump you remove material thus creating a bigger clearance between the moving parts which leads to less pressure. Given that oil pumps are manufactured to exacting tight clearances I doubt that polishing does anything else other than reduce pressure due to larger clearances.
Any marks on the vanes will only be found if there has been debris in the pump and that cannot typically be polished out due to above.
Not arguing just thinking out loud that their explanation is not shall we say entirely...
"we blueprint them" hides a litany of misinformation unless one explains what blueprint means and or entails.
If you polish any of the metal in the pump you remove material thus creating a bigger clearance between the moving parts which leads to less pressure. Given that oil pumps are manufactured to exacting tight clearances I doubt that polishing does anything else other than reduce pressure due to larger clearances.
Any marks on the vanes will only be found if there has been debris in the pump and that cannot typically be polished out due to above.
Not arguing just thinking out loud that their explanation is not shall we say entirely...