A higher viscosity index means less change as it heats up or cools down, so if your equipment starts cold or runs hot, you'll need an oil with a higher viscosity index. Oil Viscosity Chart Use this tool to know the viscosity curves of up to 4 lubricating oils at the same time. The viscosity gets thinner as it heats up, and the viscosity index determines how much the viscosity changes with temperature. The viscosity is a measure of how thick the oil is high viscosity is thick like honey, low viscosity is thin like water. Once we know what the process looks like, we can choose an oil based on its viscosity and viscosity index. Now, pitch line velocity is a gear-specific term, but you can substitute the effective velocity for any moving equipment If you find it necessaryto mix brands of oil, use same viscosity grade and API service categorytomaintain performance. This includes using recommended SAE oil viscosity and ILSAC or API performance standard. The operating temperature is just the temperature at which the machine will be operating, and pitch line velocity is the speed at which it's running. WHICH OILIS RIGHTFOR YOU Follow your vehiclemanufacturer’s oil change recommendations. This calculator uses centiStokes (cSt), which are equivalent to mm2/s.
#OIL VISCOSITY CHART ISO#
Specifically, we need to know its operating temperature and pitch line velocity(or equivalent). In the same respect, there are many ways to describe viscosity: engines use the SAE engine chart, industrial equipment mostly uses the ISO chart, gear oils. We need to match the oil to the process, so we'll look at the process first to determine what oil we need. Our checklist offers quick tips on oil selection If you have the viscosity in centiPoise, divide the centiPoise value by the oil's viscosity to get centiStokes.It may feel like there are a million different oils out there, but steps can help manage the otherwise endless task, and make it approachable. The viscosity of an oil could be reported at any temperature, but to standardize things, most laboratories report either a low temp (100F or 40C) or a high temp viscosity (212F or 100C) and stick with either Fahrenheit or Celsius. This calculator uses centiStokes (cSt), which are equivalent to mm^2/s. Higher quality oils tend to have higher viscosity indices, and while there are ranges in every category, a synthetic oil will tend to have a much higher viscosity index than its conventional counterpart. If you know the viscosity of your oil at 40✬ and 100✬ (100✯ and 212✯) you can easily calculate its Viscosity Index. Gear Dimension Calculator Get all of the dimensions you need to make your gear blank: tip, pitch, root diameters as well as the gear teeth: addendum, dedendum, working depth, whole depth. Motor oil behaves in pretty much the same way, which is why mechanics will usually run an engine for a minute or two. Its also worth noting that honey flows more easily - and is therefore less viscous - when it is slightly warm. So we describe honey as having a high viscosity.
This must be judged against the possible friction increase because of the higher oil viscosity. Honey, on the other hand, is relatively thick and flows more slowly. The higher the value, the better the lubrication condition of the bearing and its expected rated life. The viscosity of an engine oil is significant for three primary reasons.
Oil needs to flow when cold, but not get too thin and runny when it's warm. Table 1 lists the viscosity grades in accordance with ISO 3448, and shows the viscosity range for each grade at 40 ☌ (105 ☏). Designed to keep todays high-performance, low-emission engines clean and operating at peak efficiency Protects against viscosity decrease at high. That is, oil with a high VI will retain their viscosity over a wider temperature range and work as designed in both hot and cold environments.Ī higher VI is important when your machine will experience a big change in operating temperatures. The higher the viscosity index, the lower the change in viscosity. The degree to which the viscosity decreases determines the Viscosity Index (VI). The viscosity of an oil decreases as temperature increases. Imagine pouring motor oil out of the bottle how fast it comes out indicates the. Viscosity Index and what you need to know Viscosity Explained Viscosity measures how much the motor oil can resist flow.
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