In the development of large four-stroke diesel motors the further increase of the mean effective pressure is limited, among others, by the performance of the turbocharger. Two-stage turbocharging would increase the mean effective pressure, with the consequence that the peak pressure in the cylinder will also be substantially higher. The development could result in very compact large diesel engines with favourable specific weight and lower production costs per MW.

The single-cylinder research engine of the TUHH was extensively modified (D=265 mm, n=750 min^-1) and equipped with an electronically-controlled injection system. The mean effective pressure of the eingine was raised to ca. 40 bar and the peak pressure in the cylinder will reach approximately 380 bar.

A preliminary study of the combustion and the gas exchange process with the aid of modified simulation models will optimise the engine operating parameters (air pressure, injection characteristics, load variations, etc.). The empirical models for simulating the combustion process and the pollutants formation in the combustion chamber will also be adapted to the extreme operating conditions envisaged in the project. These theoretical investigations will contribute to the basic design of the injection system, the combustion chamber or the valve timing of the engine capable to operate with Miller valve timing.