Logic Quiz

[Tahurra]

Re: Logic Quiz

Interesting

[Anjul]

Re: Logic Quiz

What starts with the letter “t”, is filled with “t” and ends in “t”?

[Bobby1]

Re: Logic Quiz

@Anjul

What starts with the letter “t”, is filled with “t” and ends in “t”?

teapot

[Anjul]

Re: Logic Quiz

@Bobby1

teapot

Congrats!!

You won this —>

:k:

[Bobby1]

Re: Logic Quiz

@Anjul

Congrats!!

You won this —>

:k:

Haha..that is because I love tea,

[Anjul]

Re: Logic Quiz

@Bobby1

Haha..that is because I love tea,

lol same here.
I feel happy to tell you that I am world’s best tea maker among my fans

[Anjul]

Re: Logic Quiz

I would have offered you a cup of tea made by none other than me by now if you were here

[Bobby1]

Re: Logic Quiz

@Anjul

I would have offered you a cup of tea made by none other than me by now if you were here

Haha, there was a reason I liked you..just had an english muffin with my tea, now off to a walk on the river, got to soak in those lovely fall colors

[Anjul]

Re: Logic Quiz

@Bobby1

Haha, there was a reason I liked you..just had an english muffin with my tea, now off to a walk on the river, got to soak in those lovely fall colors

That is awesome! The Maple Leaf Forever!

[Hakuna_Matata_1]

Re: Logic Quiz

I dont know what to ask.. here is a technical question that no one ever tells or throws light on this..

why is it necessary that the oil pressure in an engine must be more or atleast equal to the weight of crank shaft or it’s sections??

[Hakuna_Matata_1]

Re: Logic Quiz

^ and this is a logical question.. pressure = weight.. but why??

[Obama]

Re: Logic Quiz

@Hakuna_Matata

I dont know what to ask.. here is a technical question that no one ever tells or throws light on this..

why is it necessary that the oil pressure in an engine must be more or atleast equal to the weight of crank shaft or it’s sections??

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.

@Hakuna_Matata

^ and this is a logical question.. pressure = weight.. but why??

as you state it is a logical question but the logic here was defined by Hakuna

We can make an Engineer out you yet!

[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..

[Obama]

Re: Logic Quiz

Right so you are an Engineer or do know about engines, then you must know also that the engines made in the 1950’s did not have oil pumps for lubrication, they were splash lubricated but for speeds over 55 mph they had warning that you were risking a lot of wear and tear on the sleeve bearings in the crank shaft and connecting rods.

so the 15-20 psi is needed for crank shaft speeds over 2000 rpm to keep the crank shaft afloat on a film of oil because at higher speeds oil gets squeezed out!

plus in old engines the gaps between crank shaft and the sleeve bearings used to be large enough for splash lubrication to work.

[Hakuna_Matata_1]

Re: Logic Quiz

@Obama

Right so you are an Engineer or do know about engines, then you must know also that the engines made in the 1950’s did not have oil pumps for lubrication, they were splash lubricated but for speeds over 55 mph they had warning that you were risking a lot of wear and tear on the sleeve bearings in the crank shaft and connecting rods.

so the 15-20 psi is needed for crank shaft speeds over 2000 rpm to keep the crank shaft afloat on a film of oil because at higher speeds oil gets squeezed out!

plus in old engines the gaps between crank shaft and the sleeve bearings used to be large enough for splash lubrication to work.

awesome info.. thanks for sharing Obama Bhai

I had an idea that engines then could only be accelerated to 200-500 RPMS..