is it the restrictor in lubrication system is use to decrease the oil pressure to the shaft?

Answer 1

It's to keep oil pressure up to the rest of the engine when the shaft bearings get worn.

Answer 2

It depends on:-

1. What you mean by a restrictor.

2. Where the restrictor is fitted.

As with any fluid or gas, lubricating oil will take the easiest path out when flowing. If you think about the fine tolerances/small clearances between the bearing shells in a crankshaft, it takes a fair amount of pressure to pump the oil into that area. It would be unwise to have a restrictor fitted that would reduce oil flow to these areas.

Conversely tolerances/clearances in other areas of an engine are not so precise, therefore the lubricant would tend to head for those areas as the easiest way out leading to possible oil starvation at points where oil is most needed.

Fitting a restrictor would reduce the oil flow to those areas and allow more efficient lubrication where it is most needed.

Answer 3

that depends on what kind of system, and if it is being used in a lubrication system. a restrictor can be used to reduce the flow of oil, but mainly in a car lubrication system a restrictor is often used to increase the oil pressure behind the restrictor, therefor making a jet of oil on the other-side of the restrictor, to say lubricate a cylinder wall at the skirt of a piston, this is often done through means of a restrictor through the oil gallery in the crank shaft, hope this helps...........................

Answer 4

No its to increase the pressure but to reduce the volume of oil.It increases the pressure at the pump side or no pressure would be produced Big end pressure is mainly produced by centrifugal force.primary cause of loss of oil pressure is worn main bearings.As they wear they reduce the restiction in oil flow so total oil system looses pressure and first thing to starve is the cam as oil has to be pumped upward to this.Pistons are mainly fed by splash but large diesels and some good small ones have piston jets that squirt oil inside piston crown for cooling