Abstract
The Agricultural Engineering Department at the University of Missouri-Columbia has fueled a 1991 and a 1992 Dodge pickup 5.9 L (360 in.3) Cummins engine with methyl-ester soybean oil (soydiesel) for more than 80 467 km (50,000 mile). The 1991 pickup has been driven approximately 48 280 km (30,000 mile) and the 1992 pickup has been driven approximately 32 187 km (20,000 mile). Fueling the engines with 100% soydiesel increased engine power by 3% (1991 engine) and reduced power by 7% (1992 engine). The pickups averaged more than 6.9 km/L (16.7 mile/gal). Analysis of engine lubrication oil suggested that the engines were wearing at a normal rate. The black exhaust smoke normally observed when a diesel engine accelerates was reduced by 86% when the diesel engine was fueled with 100% soydiesel. Increased EPA exhaust emissions requirements for diesel engines have created much interest in the use of soydiesel as a fuel for diesel engines.
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