lifter galley crossover tube

I really don't get the logic of the oil moving so fast that it can't make the turn to the mains. If the oil was moving that fast, there would be no oil pressure. Pressure is a resistance to directional flow or movement. So, in a pressure differential, pressure will always move from high areas to low areas. If the mains are the low area, that's where the oil is going, regardless of the turn into the passage.