Re: Logic Quiz
Hakuna Bhai 1) The crankshaft in Automobile Internal combustion Engines is single piece and is mounted at its two ends on roller bearings that carry the weight of the crank shaft, Pistons and connecting rods.
- The oil pressure is not related to the weight of the crank shaft, it is usually 15-20 psi (pounds per square inches) is related to the viscosity of the oil and the force required to push the oil through the oil passages in the 5 crank shaft sleeve bearings and the 4 piston connecting rod sleeve bearings, the total number in a 4 cylinder engine are 9 sleeve bearings; plus the camshaft assembly and the push rods!
These sleeve bearings have a designed in gap between the moving part (crank shaft and Pistons) and the stationary engine case. the oil fills that gap so there is no metal to metal contact when the engine runs.
as you state it is a logical question but the logic here was defined by Hakuna 
We can make an Engineer out you yet!