2008年5月1日 · HTHS is High Temp High Shear is a test method to mesure oil vis under "High Temp High Shear" conditions that would be useful in a engine such as valve train or bearing areas. 2.6 for 20 weight, 2.9 for 30 weight, as well as 0W-40, 5W-40 and 10W-40, 15W-40 as well as 50 and 60 weight oils have a minimum of 3.7.

2019年4月29日 · HTHS dynamic viscosity is the current industry standard that best predicts fluid behavior in HTHS environments. It is designed to ensure engine lubricants maintain sufficient film strength to prevent excessive wear under engine operating conditions, while also allowing engine lubricants to have low enough viscosity to deliver fuel efficiency ...

2019年8月23日 · HTHS measures the viscosity (resistance to flow) of an engine lubricant at elevated temperatures under constant shear, simulating the narrow tolerances and high speeds between moving parts in a hot engine.

What is the HTHS value for engine oil? HTHS is the abbreviation for “High Temperature High Shear”. It is the apparent viscosity of a multigrade engine oil at 150 °C (high temperature in the engine compartment) and a velocity gradient of 10 ­6 *s -1 in a defined measuring vessel according to the method CEC-L-36-A-97.

The concept exists of High HTHS and Low HTHS: A low HTHS oil has a lower viscosity at high temperature (<3.5 mPa.s) than that of a so-called High HTHS oil (>3.5 mPa.s). This notion is important as it allows for the classification, on the one hand, of fuel economy oils having a low HTHS and, on the other hand, of high protection oils having a ...

One method used to measure HTHS viscosity is ASTM D4683, officially called the Standard Test Method for Measuring Viscosity of New and Used Engine Oils at High Shear Rate and High Temperature by Tapered Bearing Simulator Viscometer at 150 °C. Engine lubricant is introduced between a rotor and a stator at the test temperature of 150°C.

2022年6月17日 · An engine oil's HTHS properties are measured by the industry standard tapered bearing simulator viscometer. Using this process, the movement of the rotor within the test cylinder generates high shear forces, which better reflects the real, dynamic conditions in the engine than measurements of kinematic viscosity.

2017年6月1日 · HTHS ( High Temperature High Shear) viscosity is the way we measure the ability of fully heated oil (150°C) to run efficiently between the narrow openings of fast-moving engine parts: for example, between piston ring and lining, valve train, gearwheel contact points, and …

High Temperature High Shear (HTHS) viscosity is the way we measure the ability of fully warmed (150°C/302°F) oil to flow within the narrow confines of fast moving engine parts. HTHS occurs in contact areas, such as the ring/liner interface, valve-train and gear contacts.

2016年1月1日 · It is known that HTHS viscosity of the multigrade motor oils affects the wear of the ICE and affects the fuel efficiency. The minimum allowable values HTHS viscosity of the engine oils are listed in the classification SAE J300.