Browse Publications Technical Papers 2019-01-0589
2019-04-02

Development of Engine Test Method to Discriminate Engine Oils and Additives in terms of Motoring Torque 2019-01-0589

Fuel economy improvement and emissions reduction are the two major driving forces in advancement of automotive engine technologies, fuel quality, lubricants and aftertreatment devices. Engine design, operating conditions such as speed and load, and engine oil behavior have significant influence on engine friction and then the vehicle fuel economy. There is no standard short duration engine test available to evaluate engine oils' friction. This study developed a test protocol to discriminate the friction reduction efficacy of engine oils / additives to support in engine oil development. The engine test facility was modified to conduct motoring test over the speed range of 1000 - 4500 rpm and at 50 - 100 °C coolant and oil temperatures. Different viscosity grades and additive chemistry i.e. combination of friction modifiers & viscosity modifiers were evaluated under motored torque test. Repeatability of test results was also ensured by conducting test many times under the same temperature / speed conditions. High viscosity index engine oils have shown better performance compared to low viscosity index oils at all temperature conditions. The friction reduction performance of same grade engine oils mainly depends upon the synergy of different constituents of additive package. This test method has shown its capability to discriminate engine oils of different viscometrics & additive chemistry and this can be used as excellent screening tool to assess friction reduction potential of engine oils.

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