Optimization of Inlet and Exhaust Manifold on a Single Cylinder Diesel Engine to Enhance the Combustion

In the internal combustion Diesel engines the most important subsystem is Intake manifold and Exhaust manifold. In the intake manifold which supplies fresh air –fuel mixture in to the cylinders where combustion takes place at high temperature and high pressure. After exhaust gases scavenged through valves from the cylinders, these gases past exhaust manifold an outlet, through which the gases flow into exhaust pipes from there to the emission control equipment of engine which consists of catalytic and thermal converters. The development of swirl can be enhanced by re-designing of inlet port of an Engine. There is further development in the swirl due to combustion process to another maximum part way in to the power stroke. Swirl can promotes the combustion process in a better way and causes efficiency increase. Better mixing of air – fuel there is a little bit changing the inlet and exhaust valve. Valve stem diameter is 9.5mm, Inlet valve diameter is 36mm, Exhaust Valve diameter is 28mm by varying the pitch 1.0mm to 2mm and thread depth of cut as 4mm and three thread per inch from this arrangement to investigate the performance by enhancing the swirl of air flow to get betterment in the performance and decrease in emissions in a (DI) direct injection diesel engine with single cylinder when compared with normal engine.