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The paper presents some experimental results concerning the use of a biodiesel type fuel (BTF). The fuel was produced using waste cooking oil, collected from a local branch of the McDonalds' restaurants. Cooking oils, used for frying food, have a limited life in food production due to their contamination with debris from food and due to fatty acids formation. As a result, waste cooking oil can be seen as a “near to waste” by-product of food production industry; thus, the use of waste cooking oil instead of virgin oil in order to produce biodiesel is an effective way to reduce the raw material cost and helps to solve the problem of waste oil disposal. The base catalyzed method was used for producing the methyl ester.

The paper presents some results concerning the use of a Biodiesel type fuel in a direct injection (D.I) Diesel engine. The fuel was produced from waste vegetable oil, collected from the local McDonalds' branch. The engine was fueled with a blend containing 50% Biodiesel and 50% Diesel fuel (B50, Biodiesel blend). The tests were developed on a D-110 Diesel engine (S/D= 130/108 mm, ε = 17, three in line cylinders); the output power, torque, BSFC, combustion pressure, pressure rate and autoignition delay were measured and the heat release rate was calculated. We noticed a slight decrease of the power indices when the Biodiesel type fuel was used (output power and torque) and also of the peak combustion rate. The peak heat release rate decreased, while the autoignition delay has decreased by 2…4° CA.