A Review on Liquid Petroleum Gas as a Fuel in Spark Ignition Engine Application

Liquid Petroleum Gas (LPG) as an alternative fuel has some excellent physical, chemical and combustion characteristics like aspects that makes it to be preferred fuel for Spark Ignition (SI) engine. It is observed that for slow speed engine, the indicated power could be directly calculated from the indicator diagram, but in modern high-speed engine it is difficult to obtain accurate indicator diagram due to effects of inertia forces. In such cases Morse Test could be used to measure indicated power, frictional power and mechanical efficiency of multi-cylinder engine. Friction of the piston ring assembly is a major contributor in total frictional losses in SI engine and piston ring assembly is dominant source of engine rubbing forces. This paper presents review on comparisons of frictional power losses, brake power and other performance parameters for spark ignition engine fueled by petrol and LPG under various engine operating conditions