The main process which is directly related with the improvement of performance, fuel economy and emission characteristics of an internal combustion engine is the combustion process itself. In order to find an optimum combustion process that meets these demands a simple Vibe based theoretical computation model was first established. Using this theoretical model some results are obtained and presented in this study. A construction of a suitable combustion chamber that will realize this process is designed and tested in a single cylinder experimental diesel engine. Experiment results of this novel combustion chamber are presented and compared with those results obtained from engine equipped with the standard combustion chamber. Indicated cylinder pressure and related pressure rise and heat release curves of the novel combustion chamber are compared with those of standard engine combustion chamber. The comparison of both type diesel engines is done at the same original maximum power. This maximum power is achieved by 23% lower maximum combustion pressure, with lower ignition retard, with approximately two times lower NOx and pressure rise values, thus with less noise emission