About car and safety

Dodane: 17-08-2016 04:54
About car and safety no smoke oil for AC

Why corresponding parts in the car are so important?

Spare parts for any car play a really important role. Cars are an ever more complex structure and many elements are interconnected. Therefore the relevant parts in our car that perfectly harmonize with each other, can ensure the proper functioning of our car. It is against this commission to carry out repairs in areas where maintenance of cars is done really fair. Improper replacement can lead not only to other faults, but also a serious threat on the road, you definitely should avoid choosing a reputable points of replacement auto parts.


Cheap motor oil for farm vehicles

While working in the country are used for a variety of motor vehicles, from ordinary cars to large combines. In view of the common agricultural vehicles sold cheap motor oils suitable for use in such devices, which must primarily operate smoothly, but also their owners depend on that to serve them as long as possible. Simple repair of agricultural vehicles can be made by their owners, and it is the most practical way to restore the ability of such vehicles to carry out their work at a time when farmers do not wish for too long lose access to their machines. Sometimes, however, they happen in these larger faults that need to be repaired in the service dealing with agricultural machinery.


Properties of oil

Most motor oils are made from a heavier, thicker petroleum hydrocarbon base stock derived from crude oil, with additives to improve certain properties. The bulk of a typical motor oil consists of hydrocarbons with between 18 and 34 carbon atoms per molecule.7 One of the most important properties of motor oil in maintaining a lubricating film between moving parts is its viscosity. The viscosity of a liquid can be thought of as its "thickness" or a measure of its resistance to flow. The viscosity must be high enough to maintain a lubricating film, but low enough that the oil can flow around the engine parts under all conditions. The viscosity index is a measure of how much the oil's viscosity changes as temperature changes. A higher viscosity index indicates the viscosity changes less with temperature than a lower viscosity index.

Motor oil must be able to flow adequately at the lowest temperature it is expected to experience in order to minimize metal to metal contact between moving parts upon starting up the engine. The pour point defined first this property of motor oil, as defined by ASTM D97 as "... an index of the lowest temperature of its utility ..." for a given application,8 but the "cold cranking simulator" (CCS, see ASTM D5293-08) and "Mini-Rotary Viscometer" (MRV, see ASTM D3829-02(2007), ASTM D4684-08) are today the properties required in motor oil specs and define the SAE classifications.

Oil is largely composed of hydrocarbons which can burn if ignited. Still another important property of motor oil is its flash point, the lowest temperature at which the oil gives off vapors which can ignite. It is dangerous for the oil in a motor to ignite and burn, so a high flash point is desirable. At a petroleum refinery, fractional distillation separates a motor oil fraction from other crude oil fractions, removing the more volatile components, and therefore increasing the oil's flash point (reducing its tendency to burn).

Another manipulated property of motor oil is its Total base number (TBN), which is a measurement of the reserve alkalinity of an oil, meaning its ability to neutralize acids. The resulting quantity is determined as mg KOH/ (gram of lubricant). Analogously, Total acid number (TAN) is the measure of a lubricant's acidity. Other tests include zinc, phosphorus, or sulfur content, and testing for excessive foaming.

The NOACK volatility (ASTM D-5800) Test determines the physical evaporation loss of lubricants in high temperature service. A maximum of 14% evaporation loss is allowable to meet API SL and ILSAC GF-3 specifications. Some automotive OEM oil specifications require lower than 10%.

Źródło: https://en.wikipedia.org/wiki/Motor_oil



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