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Using a theoretical model an optimum-burning-rate process is defined for a diesel internal combustion engine. In order to perform this combustion process a new combustion chamber, named MR-1, is developed and applied to a single cylinder experimental engine. On the basis of these preliminary studies three versions of tractor engines — naturally-aspirated, turbo-charged without and turbo-charged with intercoolers — were manufactured and Stage II and Stage IIIA exhaust gas emission standard certificates were obtained for these engines. Because this combustion system uses low injection pressures, the production costs and service requirements are lower and there is no need for high quality fuels.