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This paper reports on an experimental study of the autoignition behaviour of an automotive gasoil on a large constant volume combustion chamber with single shot injection. In the experiments the pressure and the temperature of the air in the combustion chamber before injection varied between 30 and 70 bar and between 730 and 905 K. Illumination delay and pressure delay values have been correlated with the pressure and the temperature in the combustion chamber before injection. Based on a large number of experiments, semi-empirical two-stage ignition delay formulae are proposed that give a much better description of the fuel ignition behaviour than the classical Wolfer formula. Ignition delay values, calculated with these formulae, correlate very well with the ignition delay values of the same fuel as measured in a 260 mm bore commercial diesel engine.