Abstract
Use of biodiesel produces engine oil dilution because of unburned biodiesel impinging on cold walls of the combustion chamber, being scrapped to the oil pan, and leading to changes of oil friction, wear and lubricity properties. In this paper, mixtures of SAE 15W-40 oil, which were contaminated by known percentages of the biodiesels from canola oil, peanut oil, soybean oil, and chicken fat, were tested in a pin-on-disk tribometer. A contact was employed of AISI 1018 steel disk and AISI 316 stainless-steel ball for pin material, and friction force and specific wear were measured. Wear on the disk surfaces showed that any degree of mineral-oil dilution by the tested biodiesels reduces the wear protection of engine oil even at small mixture percentages. However, these reductions were not substantially different than those observed for same percentages of dilution of mineral oil by fossil diesel. The tested mixture of oil contaminated with animal fat feedstock (e.g., chicken fat) biodiesel showed the best wear behavior as compared to those for the other tested mixtures (of mineral oil with vegetable feedstock biodiesel dilutions). Obtained results are discussed as baseline for further studies in a renewable energy multidisciplinary approach on biofuels and biolubes.
Highlights
Biofuels are an important source of renewable and sustainable energy
Gili et al [2] discussed two main reasons that are responsible for the different biodiesel dilution in engine oil: (i) that biodiesel tends to accumulate in the engine oil because of its lower distillation temperature, leading to more unburned biodiesel dilution in the engine oil, and (ii) that diesel fuels have different solvencies properties than esterfluids biodiesels
The in-process friction force measurement is presented in Figure 5, indicates that an anti-friction layer was developed on the surface in a short time for 10%, 20%, and 30% peanut oil diluted engine oil mixtures, and from that time the friction force was measured seemingly constant during the duration of the experiment
Summary
Biofuels are an important source of renewable and sustainable energy. Some limited engine oil dilution by diesel engine fuel is acceptable and it happens in all diesel engines. When the engine is fueled by biodiesel or biodiesel blends, engine oil dilution rates and their effects can be different than those from regular diesel fuel. Gili et al [2] discussed two main reasons that are responsible for the different biodiesel dilution in engine oil: (i) that biodiesel tends to accumulate in the engine oil because of its lower distillation temperature, leading to more unburned biodiesel dilution in the engine oil, and (ii) that diesel fuels have different solvencies properties than esterfluids biodiesels
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