Which issue can arise from manufacturing a bearing shell with low-grade material?
Premature bearing failure
A bearing shell must carry heavy alternating loads, resist wear from the rotating journal, and conduct heat away, which demands a good-quality bearing metal with the right strength and fatigue life.
If the shell is made from low-grade material, it is weaker and fatigues or wears faster than the design intended.
Such a shell can crack, spread, or wear through its lining early, so the bearing fails well before its expected service life.
Reduced vibration would require a better, correctly fitted bearing, not a poorer material, so that cannot result from low-grade metal.
Enhanced oil pressure and improved engine speed are set by the pump and the engine tuning; a bad bearing does not raise either and in fact tends to lower oil pressure as clearances open up.
So the likely consequence of low-grade material is early, premature failure of the bearing.
Hence, the answer is Premature bearing failure.
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