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  • Page 26 of 26 FirstFirst ... 16242526
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    1. #451
      
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      Hakuna Matata's Avatar
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      ^ and this is a logical question.. pressure = weight.. but why??

    2. #452

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      Quote Originally Posted by Hakuna Matata View Post
      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.

      Quote Originally Posted by Hakuna Matata View Post
      ^ 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!
      We don't see things as they are; we see things as we are!

    3. #453
      
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      Quote Originally Posted by Obama View Post
      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..

    4. #454

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      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.
      We don't see things as they are; we see things as we are!

    5. #455
      
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      Hakuna Matata's Avatar
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      Quote Originally Posted by Obama View Post
      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..


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