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A Cummins N14-410 diesel engine was operated on four fuels produced by blending Biodiesel (methyl tallowate) and no. 2 diesel fuel. Engine in-cylinder pressure data were collected at various engine speeds and used to evaluate the peak pressure, indicated mean effective pressure (IMEP), rate of change of pressure, rate of heat release, mass fraction of fuel burned, and charge temperature with respect to crank angle. Peak cylinder pressures for each fuel blend at all engine speeds were lower than peak pressure for no. 2 diesel fuel, the IMEP values for all fuel blends were less than that of no. 2 diesel fuel. The differences in IMEP values correlated with the differences in power output of the engine. The maximum rates of pressure rise for all fuel blends were less than for no. 2 diesel fuel. The rate of heat release decreased with increasing engine speed as well as, with the amount of methyl tallowate in the fuel blend.