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Aggravation of combustion efficiency cause by increase of un-burnt fuel is the major problem in case of premixed compression ignition combustion with early timing injection. In this study, formation of lean air-fuel mixture by near TDC injection timing was investigated. As a natural consequence of this approach, permissible mixing time fall short. Therefore ultra high pressure injection system combined with micro hole nozzle was used in this work for increase of turbulent mixing rate. In this study, commercial Diesel fuel of Japan (JIS#2) was used as the test fuel. Cetane number of this fuel is 62. Some of previous research work shows that required injection timing for lean mixture formation to reduce NOx emission with high cetane number fuel was -90 deg.ATDC or more advanced point. On the other hand, injection timing of indicating extremely low NOx emission level is -38 deg.ATDC in our test result.