Performance Test on Single Cylinder Four Stroke Compression Ignition Engine by Varying Nozzle Diameters at Various Pressures Parameswara rao Goddeti1, Dr. Mahesh Mallampati2 Dr. Ariga.RamaRao3 1M.Tech Student, Department of Mechanical Engineering, Guntur Engineering College, Guntur, AP 2Professor& HOD, Department of Mechanical Engineering, Guntur Engineering College, Guntur, AP 3Professor, Department of Mechanical Engineering, Guntur Engineering College, Guntur, AP 1 [email protected] 2 [email protected] 3 [email protected] ABSTRACT The engine ratings usually indicate the highest power at which manufacturer expect their products to give satisfactory of power, economy, reliability and durability under service conditions. Maximum torque and the speed at which it is achieved. The performance and emission characteristics of diesel engines depends on various factors like fuel quantity injected, fuel injection timing, fuel injection pressure, shape of combustion chamber, position and size of injection nozzle hole, fuel spray pattern, air swirl etc. In the present investigation, the experiment conducted by varying nozzle flow area (i.e. the number of nozzle holes × nozzle hole diameter) and fuel injection pressure at different loads. For these two kinds of nozzles (with nozzle flow areas of 3 × 0.28 mm, and 4 × 0.24 mm respectively) are selected. In the present work Diesel fuel has to investigate in a constant speed, CI diesel engine with variable fuel injection pressures (170, 180) and by varying nozzle holes. The main objective of this project is to investigate the effect of injection pressures and the nozzle holes on performance of the engine by using diesel on a single cylinder four stroke CI Diesel engine. In the present investigation two kinds of nozzles (with nozzle flow areas of 3 × 0.28 mm, and 4 × 0.24 mm respectively) are selected and fuel injection pressures (170, 180) are varying. Keywords: Brake Power (B.P), Frictional Power (FP), Indicated Power (I.P) Brake Specific Fuel Consumption (B.S.F.C), Total Fuel Consumption (T.F.C), Volumetric efficiency (ηvol), Brake thermal efficiency (ηbth), Indicated thermal efficiency (ηith ), Mechanical efficiency (ηmech).