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Converting diesel engines to cheaper and cleaner fuels like LPG and CNG, with conventional methods needs a different combustion chamber, which has a lower compression ratio than a diesel engine (≻16:1) due to risk of detonation. This alteration makes the conversion process more expensive and difficult. On the other hand, decreasing a compression ratio leads to lower performance and efficiency compared to those of the original engine. To overcome this disadvantage it is proposed a novel mechanism for mixture formation and combustion, named as "MR-Process." This mechanism is realized in a combustion chamber MR-2 with twin-swirl turbulent flow. This chamber is suitable for operation with diesel fuels as well as with LPG and NG. In this paper are presented theoretical and experimental investigations of engines operating with "MR-Process" combustion mechanism.

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.