A case study on existing petrol car engines design parameters

摘要

New model cars are rolled out with advanced technology to reduce emission, fuel consumption, weight, noise and to improve the stability of the vehicles. Engine performance is predicted based on cylinder diameter, stroke length, fuel supply, combustion methods, speed and compression ratio. Designing of a new engine is based on experience about the existing engine similarities and performances. In this work, a study was conducted on existing 50 4-cylinder petrol engine car models in India. Information on engine bore, stroke length, cubic capacity, compression ratio, kerb weight, maximum brake power and torque was collected from automobile related sources. Stroke length was observed increase and stroke to bore ratio decrease with increasing bore of the engines. Maximum brake power and torque of engines are proportional to bore of engines. BMEP, brake power per unit volume, brake power per unit piston area, brake power per unit weight tend to rise and piston speed and weight per unit volume tend to decrease with increasing bore for the existing petrol car engines. The results show similarity between existing car engines and give an idea to design new petrol car engines for best performances.