Internal combustion engine popularity has been won commercially by the four-stroke type engine surpassing the two-stroke and rotary wankel engines in the world market places. Commercial engines both gasoline and diesel fuels are mostly using the four-stroke principle and even the hybrid cars still rely on this type of engine as their backup source of power. Current research in this areas are optimizing the effectiveness of the four-stroke combustion engine related to fuel consumption, fuel-air mixture, reuse of exhaust energy to feed air inflow, fuel control system to feed exact volume of fuel, exact firing time using intelligent control unit and lower hydrocarbon emissions. However, the development in the engine power output generation is limited due to nearly satisfied expectation of the automotive users caused by limited road development; meanwhile, the short range aerospace engine technology has limited attention in the advanced countries but certainly not in the archipelago country such as Indonesia. This paper is classified to initiates first publication from series of research log book on a new engine design that promotes double power output principle called Double Power Ecological Engine (DPE) for power drive vehicles. The design of DPE engine is located in the firing order, which has direct influence to the new design configuration of crank shaft, air inlet, exhaust and the piston head geometry. The ultimate design of this combustion engine is secured under the firing orders, which are made to secure power output twice as much as it is in the four-stroke engine so that double potential power engine is promoted under ecological fuel ethanol. The design of DPE engine of this research is expected to generate 280 kW power output based on the 1.4 liter engine, which commercially generate around 141 kW. Further research will show the effectiveness of the DPE engine design leading to commercial application.

Abstract:Two stroke engine is almost left out by automotive industry in urban development due to several unsolved problems including higher pollutant, fuel consumption, and impractical oiling in the combustion chamber. However, it still promotes an unforgettable advantage in generating rapid potential power twice as much as it does in the four stroke engine. This paper is one of the series research publications on the two stroke double potential power ecological engine with spark assisted compression ignition, which can maintain lower emission, better fuel consumption and practicality of the fuel type, while at the same time improve the thermal efficiency of the double power generation. Technical finding on the development has been reserved for certain purpose; therefore, such material will be presented on the basis of conceptual design to qualify for academic publication. The design of Double Power Ecological Engine had been published as it is stated in the first reference, so that some detail thermodynamic consideration will not be rewritten. The design of new development including managing steps of combustion cycle, controlling the air-fuel ratio, introducing new way of eliminating knock limit, and improving thermal efficiency will be described.