In order to lubricate bearings on a crankshaft of an internal combustion engine, prior art techniques have passed oil through openings in the crankshaft's main bearing, which transmit oil into an internal gallery of the crankshaft, as an opening in the crankshaft rotates past the openings in the bearing. The main bearing is typically a shell bearing, with holes passing through it, having a grooved interior to facilitate oil flows into the crankshaft. After passing through the main bearing, the entering oil passes through internal galleries in the crankshaft to subsequent bearings, such as the big end bearing. Mostly because of the effect of the spinning of the crankshaft, the entering oil undergoes a pressure drop between the external pressure gallery and the big end bearing; for instance, the oil may drop in pressure from 60 psi (4 bar) in the external pressure gallery down to 30 psi (2 bar) at the big end bearing, in a common automotive engine. Thus, because of this pressure drop, in order to achieve a desired oil pressure at the big end bearing, the external gallery must have a high oil pressure. Therefore, large pumps must be used to pressurize the external gallery, which add cost and weight to the engine. To alleviate such problems, attempts have been made to force oil through the end of the crankshaft, but these techniques have proved awkward and expensive.