JME_V5_N3_RP4 K. Bala Showry A.V. Sita Rama Raju P. Ravinder Reddy Journal on Mechanical Engineering 2249 - 0744 5 3 24 35 Split Injection, CFD, SOI (Start of Injection), DOI (Duration of Injection) The main aim of this paper is to improve the performance and to reduce the emissions of CI engine combustion. Experiments have been conducted on a single cylinder CI engine with normal injection and two pulse injection (split injection). From the simulated results and also existing experimental results it was observed that 10° dwell for double injection gives better results. In the present work, for split injection, existing cam shaft has been replaced with a modified cam shaft with a dwell angle of 10°, and experiments have been carried out with normal camshaft for single injection and with modified cam shaft for double injection. In double injection 50% of the total mass of the fuel was injected in the first pulse and the remaining 50% was injected after a dwell of 10°. Experiments have been carried out for Single Cylinder Diesel Engine with the normal cam shaft which was existing in the engine for different loads (25%, 50%, 75% and 100%). The modified camshaft with double injection was tested with a dwell of 10°. In the first injection 50% of the fuel was injected and remaining fuel was injected after a dwell of 10°. The cycle peak pressure in double injection has been increased by 8% for full load, NOx emission has been reduced by 8.67%, and CO levels were reduced by nearly 30%. May - July 2015 Copyright © 2015 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3443