ONE-THOUSAND-HOUR ENGINE DURABILITY TEST WITH HYSEE AND USING A 5X-EMA TEST CYCLE

Abstract

A modified 1000-h EMA-based test was run on three Yanmar 3TN75E-S 15 kW (20 hp) diesel engines fueledwith three different blends of hydrogenated soy ethyl ester (HySEE). Fuels used in the test were 100%, 50%, and 25%blends of HySEE with type 2 diesel fuel (D2). Eight-thousand one-hundred and five liters (2141 gal) of HySEE wereproduced for the test using the process developed at the Department of Biological and Agricultural Engineering at theUniversity of Idaho. The blends of HySEE performed adequately compared to diesel fuel. However, cold weatheroperation was a continual challenge. At each of the normal oil change intervals, oil analysis results for wear metals forthe 100% HySEE engine were equal to or better than either the 25% HySEE or the 50% HySEE fueled engine. Engineinjector pressure and compression was essentially unchanged for all engines over the course of the 1000 h. The enginefueled with 100% HySEE was cleaner and brighter internally than either the 25% HySEE or the 50% HySEE fueledengine. The 25% HySEE fueled engine was overfueled in the torque range according to a post injector pump test.