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ASTM D2270 for calculating viscosity index from kinematic viscosity at 40 and 10
ASTM D2270 for calculating viscosity index from kinematic viscosity at 40 and 100°C1. Scope1.1 This practice specifies the procedures for calculating the viscosity index of petroleum products, such as lubricating oils, and related materials from their kinematic viscosities at 40 and 100°C.1.1.1 Procedure ...
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What is Boundary Lubrication?
What is Boundary Lubrication?Boundary lubrication is lubrication by a liquid under conditions where the solid surfaces are so close together that appreciable contact between opposing asperities is possible. The friction and wear in boundary lubrication are determined predominantly by interaction between ...
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Effects of temperature on engine lubricating oil - high oil operating temperatur
Effects of temperature on engine lubricating oil - high oil operating temperatureHigh oil temperature operation can be a lot more detrimental to the wellbeing of an engine. Although it is common knowledge that the higher the temperature the more efficiently the engine runs, it also has its optimal operating ...
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Effects of temperature on engine lubricating oil - low oil operating temperature
Effects of temperature on engine lubricating oil - low oil operating temperatureKeeping all of this information in mind, if the optimal oil operating temperature is not achieved, the engine will be in an inefficient running and lubrication state.If the oil operating temperature in the sump is below 90°C ...
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Effects of temperature on engine lubricating oil - boundary lubrication
Effects of temperature on engine lubricating oil - boundary lubricationA boundary lubrication regime lubricates all additional components within the engine that are not lubricated under pressure. The components that fall into this category are pistons, piston rings, camshaft lobes, cam followers, rockers, ...
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Effects of temperature on engine lubricating oil - hydrodynamic lubrication
Effects of temperature on engine lubricating oil - hydrodynamic lubricationHydrodynamic lubrication works in the following way: oil is pumped from the oil pump through a heat exchanger and then a filtration system to the crankshaft under pressure. At operating temperature this process occurs almost immediately ...
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Effects of temperature on engine lubricating oil - viscosity
Effects of temperature on engine lubricating oil - viscosityWhen an oil is heated up, its viscosity will decrease. The formulation of the oil is such that it keeps the following in perspective: the oil must be able to be pumped through the system as fast as possible when cold on start-up in order to ...
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Effects of temperature on engine lubricating oil
Effects of temperature on engine lubricating oilThe effect of temperature on engine lubricating oil is an important consideration to take into account when operating a large fleet of vehicles. Except for electrically powered units, all vehicles are powered by a combustion engine of some description, ...
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Comparative Viscosity Classifications
Comparative Viscosity ClassificationsNotes(1) Viscosity can only be related horizontally.(2) Viscosities based on 95 VI single grade oils.(3) ISO and AGMA viscosities are specified at 40oC.(4) SAE 5W, 10W, 75W, 80W and 85W viscosities are specified at low temperature. Equivalent viscosities at 100oF ...
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Automotive Gear Lubricant Classifications
Automotive Gear Lubricant ClassificationsSAE J306 (Gear Oils)Again, the classification is based on the lubricant viscosity measured at low and/or high temperatures. The high temperatures values are determined according to method ASTM D445. The low temperature values are determined according to method ...
