The viscosity of oil and its impact on the car engine

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2018-03-24 11:46:08

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Any liquid has viscosity, this characteristic determines its fluidity. Motor oil is designed to perform a number of tasks, so each parameter has an impact on the overall quality. The viscosity of the oil is not an exception.

The Main technical task of any motor oil is to stop friction of moving parts during engine operation. Ideally, friction should be minimal at high durability of the oil, its properties must remain constant under a wide temperature range.

To Realize this idea in practice and to create a substance which would meet all requirements is very difficult. Besides, it is necessary to consider that during the movement the load is constantly changing, and the temperature of the car engine oil will be very different, at some point it will reach 140-150 degrees.

However, specialists are constantly working on creating a engine oil that would be as close in its properties to the desired settings. Science has done enough in that direction a step forward, so modern engines are significantly more powerful and more effective than their predecessors, and they work longer.

Oil Viscosity is one of the most important parameters. While the engine is cold or not working at full strength, the engine oil begins to thicken. In this regard, there is a requirement that the oil must remain liquid in all circumstances, even if the temperature outside well below freezing. The better the fluidity is, the better it will protect the engine during operation.

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Viscosity Index

To determine the viscosity of the oil, experts have introduced a special index, which reflects the dependence of the main parameters (including viscosity) on temperature. The higher the index, the better the oil retains its fluidity even at low temperatures.

The Oil should in all circumstances remain on engine parts, but to maintain its fluidity. Classification of the oil, usually done on the index, as it is one of the most important indicators that reflects the main characteristics.

The index of the 5W means that the engine can be started even at a temperature of - 35 degrees without preheating. The lower the temperature, the thicker will become oil, and it is difficult to "provorachivayut" engine, this means that the starter can not crank the motor. When selecting oils always need to focus on basic tasks, but not forgetting about the auto manufacturer's recommendations. It is necessary to consider the design of the engine, wear and tear, the most frequent modes and so on.

Motor Efficiency

In Addition, the viscosity of the oil affects the engine efficiency, namely the energy distribution. During engine operation some part of energy is spent on their own internal needs, i.e. this means that the engine requires energy to overcome friction from the contact between the different parts. The better and more efficient oil, the less energy will be wasted on this.

Now used oil classification introduced by the American society of automotive engineers. To to one category or the other, the oil should meet some requirements. The kinematic viscosity of the oil is determined at temperatures 40 and 100 degree, and is measured with the passage of the special curved tube viscometer. This determines the actual viscosity of the oil, to identify which applies a special formula. Such test allows to determine the quality of the oil, and also assign a specific category.


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KK: https://tostpost.com/kk/avtomobil-der/13553-b-l-b-ld-red-emtihan-gibdd.html

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ZH: https://tostpost.com/zh/cars/8252-what-is-the-exam-in-the-traffic-police.html






Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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