How is lubricant measured?
Abstract: Techniques developed to measure engine lubricating oil consumption rely on direct measurement using gravimetric or volumetric methods, or on inference tests by measuring the quantity of a tracer in the exhaust gas.
How do you calculate lubricant oil consumption?
Example calculation of engine oil consumption
- 916.3 x 100 x 0.52 = 47647 grams. At 20 degrees C, the density of 15W40 oil is about 0.8787 Kg/L. So 47647 grams of oil would equate to:
- 47647 / 0.8787 = 54.225 Litres of oil.
What is the unit of lubricant?
Nowadays, lubricant viscosity is usually expressed with the units centistoke (mm2/s) and centipoise (mPas).
How is oil viscosity measured?
The most common method for measuring kinematic viscosity is the use of a gravimetric capillary (Figure 1) that is usually temperature controlled at 40°C and 100°C for multigrade oils, and only 40°C for single grade oils. Most the laboratory instruments use glass capillaries or “tubes”.
How are centistokes measured?
The viscosity is typically reported in centistokes (cSt), equivalent to mm2/s in SI units, and is calculated from the time it takes oil to flow from the starting point to the stopping point using a calibration constant supplied for each tube.
What is the average lube oil consumption of cylinder?
In one study, with a 6 cylinder, 4 valve/cylinder diesel engine, oil consumption from the valve train with the baseline valve stem seals ranged from about 1.5 to 5 g/h (0.06 to 0.20 g/h-stem).
How much oil consumption is normal?
Oil consumption in modern passenger car engines is usually less than 0.05 %; the maximum permissible oil consumption stands at 0.5 % (all percentage values relate to actual fuel consumption). Normal oil consumption may be higher for older engine types, stationary engines and under special operating conditions.
What is the viscosity of lube oil?
A traditional mineral oil has a viscosity index between 95 to 100. The VI of a highly refined mineral oil (hydrotreated) can be up to 120. Hydrocracked base oil will have a VI greater than 120, while synthetics may have a higher VI.
What is cSt in lubricants?
The other unit is the Centistoke (cSt) which is used to report the kinematic viscosity of motor oil at high temperatures. The number reflects the time required for a fixed amount of fluid to flow through a certain sized orifice on the testing device.
What is oil viscosity grade?
Engine oil viscosity refers to how easily oil pours at a specified temperature. Thin oils have lower viscosity and pour more easily at low temperatures than thicker oils that have a higher viscosity. Thick oils are better at maintaining film strength and oil pressure at high temperatures and loads.
What are oil viscosity numbers?
You can find the viscosity rating directly on the oil’s bottle. The higher the number, the thicker the oil. The lower the number, the thinner the oil. For example, a rating of 5W-30 means that the oil will have a viscosity rating of 30 at 212℉, or 100℃, (an engine’s average operating temperature).