Port fuel injection is a proven technique in gasoline engine for its simplicity and cost effectiveness. This technique is a remarkable successor to conventional carburetors in reducing emission and improving transient performance. Nowadays, port injection technique is widely researched in Homogenous Charge Compression Ignition (HCCI), Premixed Charge Compression Ignition (PCCI) and Reactivity Controlled Compression Ignition (RCCI) systems, which reduce NOx and soot emission significantly. However, usage of high viscous fuels like diesel in the above techniques has to overcome various challenges like improper vaporization, wall wetting and poor atomization. This article aims to identify the way to obtain a typical diesel spray similar to that of gasoline spray in port injection by elevating the fuel temperature and injection pressure. The results show that the diesel spray at an elevated temperature of 80°C and an injection pressure of 4 bar looked similar to that of gasoline spray (at 33°C and 3 bar). Further experimental studies on engine was performed in Diesel-PCCI mode to study the influence of heated diesel over unheated diesel spray on engine performance and emissions. © School of Engineering, Taylor’s University.