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A single cylinder research engine, based on the Paxman Valenta RP-200, was constructed with the aim of achieving high levels of mean effective pressure and investigating the problems involved. Experimental work on the engine has achieved up to 35.4 bar BMEP. Firing pressure has been limited to values no higher than normally experienced on multi-cylinder engines by a reduction in compression ratio 8:1. Full details of the engine performance, e.g. air and fuel consumption, exhaust temperature and exhaust clarity, etc. are presented for a range of speeds and compression ratios with varying boost pressure.

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.