Hydrodynamic Bearings

[123Cat]

Have a guess how much pressure is built up in say for example your crankshaft bearings ,

the pressure that mostly seperates moving parts

so they dont rub together and destroy themselves

[mik]

No idea mate, give the good oil !

[madmelon]

It'd depend on the load, oil viscosity and relative speed but somewhere in the MPa (ksi) range. There's only a minute film of oil at the point of nearest contact though.

[123Cat]

Your bearing clearance and surface finish play a part too

It can be over 6000 PSI at the thin part of the oil wedge ,

oil pumps and oil pressure have nothing to do with it , they just supply oil to the area needed, the rotation of the part does the rest

When you have 6 tonnes of load coming from the rod you need that pressure