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Current and previous research works on ways to tackle problems related to future emission requirements of the internal combustion engines have always been mainly on exhaust gas after-treatment, either being a filter or a catalyst device installed at the engine after-exhaust system. From the engineering point of view, however, the exhaust after-treatment is only the second best solution, minimizing of pollutants in the engine itself should be of prime target. A conceptualised new sequential two-stage combustion system is believed to be the solution to many difficulties posed by modern engine requirements. The proposed engine system is designed to handle the main combustion process in a conventional reciprocating engine, and the secondary combustion process in a Wankel-type rotary unit; all processes have to be completed within one fall engine cycle.