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The crank angle locations for the first occurrences of several main combustion events in a Diesel engine were investigated for varied fuel parameters. The events studied include preflame reactions premixed flame propagation, start of pressure rise, maximum rate of pressure rise (dp/dt), and peak cylinder pressure. The fuels employed in the study were in two groups (1) Base fuel-1 and derivatives prepared by mixing it with small doses of a cetane number (CN) enhancing additive and (2) Base fuel-2 and those made by adding different amounts of bio-Diesel fuel. The experiment was performed by using a single-cylinder direct-injection (DI) Diesel engine equipped with an electronically controlled high-pressure fuel injection unit. The in-cylinder processes during the periods of ignition delay and combustion reaction were measured by using a high-speed multispectral infrared (IR) imaging system developed at Rutgers University. The other events were found from the pressure-time history.