Quote:
Originally posted by Dave Brand
quotation from 'Powder Metallurgy for Engineers' on the subject of steel-backed bearings, as used for mains & big ends:
>>Steel-backed Bearings
Bearings of this type are produced in very large quantities for all types of internal combustion engine. As the name implies, the bearing is of composite construction with two or three of these main components
a steel shell which serves to support the bearing during manufacture and in service;
a sintered lining applied to the shell and bonded to it during the manufacturing process; it may be porous or fully densified;
a surface layer which may be applied as an overlay to a fully dense layer or as an impregnant into a porous substrate.<<
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Well quite possibly the fully dense layer maaaan!! has like, whale, bin, worn away (liiike), exposin the soft porous underbelly which is the substrate??? (with apologies to the Young Ones)