A Comparative Study of an Lpg- Spark Ignition Engine using Liquid Sequential Injection Technique

The development of liquid phase Liquefied Petroleum Gas (LPG) as an alternative fuel for the gasoline fuel is becoming popular in spark ignition engines. In this research, an experimental work was conducted on a1.6L 4-cylinder multi-port injection engine. The engine was retrofitted with a Liquid Sequential Injection (LSI) LPG system. Its performance in terms of brake power, brake torque, brake specific fuel consumption (BSFC) and exhaust gas emissions (CO, CO2, HC, O2, and NOx) were evaluated from 1500rpm to 4000rpm with half-open and wide open throttle positions. In comparison with gasoline, the brake torque and brake power for LPG were higher, but the BSFC and exhaust emission of CO and CO2for LPG are lower