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Today in developing countries, carburetors are mainly used in small engines for motorcycle application. Carburetor takes more time for the mixture preparation process, hence the response of the vehicle is sluggish for the rider. To overcome this problem is fuel injection system. The purpose of this work is to study the transient response of a gasoline fuel injection motorcycle engine with different injection parameters. The analysis of the flow is conducted using the commercial CFD software. The simulated results are also compared with the stand start acceleration test results done on the motorcycle, which shows 11% improvement than carbureted vehicle.

The spark-ignited (SI) engine running on gaseous fuels produces 3-5% lesser power compared to the gasoline engines. The objective of this present work is to improve engine torque by optimizing spark timing, compression ratio and spark plug location. In this study, a 4-stroke, SI engine designed for gasoline fuel is converted completely to Liquefied Petroleum Gas (LPG)-fueled engine and operating parameters is optimized using CFD. A computational model is developed using commercial CFD software (STAR-CD), to simulate the crank angle-resolved in-cylinder pressure (P-θ). This model is validated against the experimental measurements and then used to optimize the above said parameters. The optimized LPG-fueled engine resulted in 15% increase in IMEP.