Logic Quiz

[Hakuna_Matata_1]

Re: Logic Quiz

@Obama

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.

2. 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!

lol, you defined it right.. but why do we need that much force to push oil in inserts of main and general bearings??

as you said engines have 15-20 PSI oil pressure.. right?? but Oil can go through a fully filled line at just 1 PSI with just 2.5/1000 space(clearance) of an inch.. whereas as water can pass from 0.5/1000 of an inch.. which technically means it require less than 0.5 PSI pressure to leak from any narrow clearance.. and why is there 15-20 PSI then ?? which is way more than the weight of Crank shaft??

Here is the logic thingy..

When engine starts.. The Crank Shaft doesn’t touch anything while revolving around it’s axis in oil.. An Ideal engine’s crank revolves in Air with a thin pressurized oil shim around it’s insert/bearings..

Hope you find it interesting..