This paper describes simultaneous attainment in improving fuel consumption, output and reducing HC and CO Emissions with a preheated direct injection SI engine. In the present work, many modifications were made for the developed direct fuel injection system. The performance of the 350 cc Bullet engine under all modification is compared with an objective to achieve better power and emission characteristics with the latter. The complete atomization of fuel is necessary to achieve proper mixing that is, the mixture can be homogenous. To achieve this the atomization of fuel is done by using preheating the fuel before it is ignited by the nozzle thus the fuel preheated atomizes well compared to cooler fuel. The present work gives way for improvement of performance of the engine. For motorcycle application, a central injection, spray guided DI combustion may offer the characteristics required to meet many of challenges of this difficult application. To demonstrate the potential of such an application, a 350cc engine has been developed using an air-assist DI spray guided significant fuel economy improvements when compared to the baseline carbureted engine, as well as potential to meet current and future emission legislations with a variety of system configurations.
Research on alternative sources to replace fossil fuels has been started decades ago and still an uninterrupted process. Partial replacement rather than complete is justified with real-time applications. In this research, engine outcomes based on palm oil biodiesel blends are elaborated. The transesterification processed biodiesel from raw palm oil is used to run the engine with a blend proportion of P10D90 and P20D80. From the results obtained, the performance of an engine was degraded with an increase in biodiesel proportion and consumes higher fuel. At lower load diesel and P10D90 have almost equal thermal efficiency whereas at peak load it is found that 39.1% and 37.6% respectively. Apart from CO emissions, there is an increment in CO2, HC, and NOX with the load. NOx emissions are in the margin with diesel for P10D90 at part load. P10D90 shown slightly lower in-cylinder pressure at full load compared to diesel.However, it is seen that P20D80 has given depreciated performance readings, lowered cylinder pressure 55.8 bar, and higher emissions at rated torque. From the experiment, it is noticed that above 10% of the biodiesel blend engine required suitable modifications and accessories to overcome demerits associated with blend characteristics.
The present energy situation has stimulated active research interest in non-petroleum and non-polluting fuels, particularly for transportation, power generation, and agricultural sectors. This paper describes feasibility of utilization of Spark ignition (SI) engine in single fuel mode and to develop the optimum operating conditions in terms of fuel injection timing and fuel injection pressure. Many modifications were made for the developed direct fuel injection system to improve the performance of the 350 cc four stroke single cylinder petrol engine. The engine is tested to conduct performance, combustion emission characteristics with the aid of carburetor. As single cylinder small engines have low compression ratio (CR), and they run with slightly rich mixture, their power are low and emission values are high. In this study, methanol was used to increase performance and decrease emissions of a single-cylinder engine. Initially, the engine whose CR was 7.5/1 was tested with gasoline and methanol at full load and various speeds. This method is used for increasing the fuel efficiency of a vehicle by adding different percentage of methanol to the petrol and to decrease the pollutants produced during combustion process.
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