Cross Drill Oil Holes on Crankshaft Journal

A lot of people believes a cross drill oil hole on crank journal will increase lubrication passage. But, we believe a crank with cross drill oil hole will reduce lubricating function. The reason is very simple, the oil pick up from the rod journal flow into the main journal. Without cross drill, these lube will pour into one end of this passage to create higher lube oil pressure. With cross drill, the oil may divide to both end. Of course the oil pressure will reduce and minimize the lubrication purpose.