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In recent years, diesel engine exhaust gas regulations become more severe due to environmental concerns. Especially, particulate reduction is one of the biggest concern, and the reduction through high injection pressure has been studied.(1), (2) and (3) However, much is not yet known about the influence of changes in fuel flow inside the nozzle tip on atomization and engine performance, and there would exist a lot of room for exhaust gas reduction through the nozzle modification. In this research we found that changing the shape of the nozzle tip showed a remarkable difference in the smoke emission at low engine speed, analysis showed that difference in the flow rate at the nozzle orifice cause difference in the fuel spray droplet size and therefore the difference in the smoke emission.