In this paper a CFD analysis of a rectangular fin engine is carried out. A two wheeler bike engine is chosen (e.g. Unicorn bike engine) and geometry is designed in Design Modeller in Ansys 16.0. Presently material used for is Al 6063 which has a thermal conductivity of 200 W/m K. A modification in design of engine is made by creating holes on fin. Transient and Steady state heat transfer simulation is carried out on the engine for a period of 400 seconds. An Extensive analysis has been carried out to study the variation of temperature on creation of various diameters 2mm, 6mm, & 10mm holes on fin. In addition, a perforated fin was compared with an imperforate fin to observe the differences. It is observed from the results that before a time period of 400 seconds Transient temperature of all fins has reached to steady state temperatures. However, Fin with a hole of 10mm dia has decrease the minimum temperature of 1036.5 K for an imperforated fin to a minimum temperature of 989.03 K.
