Quote Originally Posted by metric_taper View Post
I believe that taper, is an oil pump, it rotates in the sump of oil, and centrifugal forces of the oil in the hollow shaft brings the oil to the top of the hollow crank shaft, where it slings out to lube the con rod via an oil gallery, and the piston.
I checked mine and can confirm the truth in the quote, except that it is not the taper that is the pump, it is the eccentric nature of the crank that is effectively the pump.