Re: Re: Re: Makeing engines last!

Posted by Teck Man. on September 05, 2002 at 14:37:48 from (198.81.27.7):

In Reply to: Re: Re: Makeing engines last! posted by Art M on September 02, 2002 at 17:57:06:

Motor oils are sophisticated functional chemicals that our enginedriven culture cannot live wuthout.To insure that motor oils function at specified levels,there various properties are tested,using standardized procedures.Important properties include safety characteristics,viscosity,performance at temperature extremes and volatility.
FLASH POINT: represents the temperture at which oil will ignite,but not sustain combustion,when axposed to an ingnition source.Fire point describes the temperature at which an oil will sustain combustion after ignition when exposed to an ignition source.Flash and fire points are safety considerations.Flash point also describes a performance parameter.
Kinematic viscosity: Is the measure of a fluid's resistence to flow nnder the influence of gravity. If equal volumes of two fluids are placed in identical vessels and allowed to draine out as a result of gravity,the more viscous fluid will take longer to drain than the less viscous fluid will take. The ASTM Standard D-445 describes an oil's kinematic viscosity at 40 C or 100 C. An oil's kinematic viscosity at 100 C is used to assign its SAE grade. In the ASTM D-445 test,a tube with a fixed opening is suspended in a constant temperature bath and the at which the oil flows from the tube is measured.The slower the flow,the greater the oils's viccosity.

In theASTM D-4684,also called the Mini Rotary Viscometer,a string with a small weight on the end is wound around a shaft and turns the shaft at avery low shear rate in an oil-filled bearing. Chemists measure the shaft's turning speed to describe the oil's "pumppability," or resistance to flow into the oil inlet after the engine is started in cold temperatures.The results of the ASTM-D4684 test are also used in SAE "W" grade assignments.
Evaporation loss: This leads to increased oil consumption and changes in oil properties. "Evaporation loss" means the reduction in weight,reported as a percentage,of an oil after exposure to heat and mild vacuum.The Noacl Volatility Test measures evaporation loss at 250 C for motor oil. I have mor for you later if you want?

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