In other words, you’ll have to apply more force to move an item in a high-viscosity liquid than in a low-viscosity one. If you run your hand through a bucket of water and a bucket of honey, you’ll see that it’s much easier to move your hand in water than in honey. The oil viscosity grade you choose decides the rate of fuel consumption. Oil viscosity directly impacts the engine’s performance. How Does Oil Viscosity Affect Engine’s Parameters? While you’d usually deal with SAE oil grades, you can read the viscosity of engine oils of ISO and AGMA oil grades using the viscosity chart. In the middle of the viscosity chart, you’ll have 4 different oil grade types. In typical viscosity charts, you can find the saybolt viscosity of an engine oil at warm temperature (100 ☏) and hot temperature (210 ☏) ISO/ AGMA/ SAE Viscosities You can find the saybolt viscosity on the right of the chart, and we measure it with Saybolt Universal Seconds or SUS. It’s based on the time it requires in seconds to heat oil. Saybolt viscosity is another measure of engine oil viscosity. In usual viscosity charts, we can check the kinematic viscosity of an engine oil at warm temperature (40 ☌) and hot temperature (100 ☌). We have the kinematic viscosity on the left of the chart, and we measure it in Centistokes or cSt. That’s why it flows slowly compared to the light water. Kinematic viscosity refers to the difficulty in the flow of a liquid due to gravity. In the oil viscosity chart, you’ve got different viscosity grades in the middle and the corresponding kinematic viscosity and saybolt viscosity at two temperatures on the left and right, respectively. Image source Basic Understanding of the Oil Viscosity Chart All of these oil types are displayed in the middle of the viscosity chart. There are different classifications of viscosity grades depending upon the oil type. Image source Reading the Oil Viscosity Chart On the other hand, SAE 5W-20 will always flow better than SAE 20W-50. But when you’re driving, the SAE 10W-30 will flow better as the oil will get hot and its hot oil viscosity grade of 30 is lower than 40 of the other engine oil. In other words, SAE 0W-40 will flow better than SAE 10W-30 when it’s cold as 0W is less than 10W. Viscosity grade is a measure of oil viscosity: the lower it is, the lower the oil viscosity, and vice versa.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |