The potential of high pressure turbocharging for highly rated diesel engines is discussed. A single cylinder engine, which is based on a current production engine data, has been specially built for experimental work. A mathematical model has been prepared to predict the inlet and exhaust manifold conditions for the single cylinder case. The paper describes the design features of the single cylinder experimental engine and also an outline of the mathematical model. The predicted results for uprating from 19.3 bar BMEP to 33 bar BMEP are also shown. The results from the experimental study will be reported at a later date.