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Cylinder pressure analysis in internal combustion engines involves measuring very large quantities of data, typically 2 Mbytes per test point. Derived results, such as peak cylinder pressure, IMEP and burn angles can be calculated either in real-time or by post-processing of the pressure data and the need for long term saving of the raw data after processing is then optional. Despite the many advantages of retaining the raw data, this is often not done because of the necessity for large capacity storage systems and the time required to transfer the large files across networks. The ideal situation would be to save the derived results and statistical parameters plus the raw pressure data in a much more efficient format which offers substantially smaller data files without significant loss of accuracy and functionality.