The effect of advanced ignition timing on ethanol-gasoline blended spark ignition engine

Ethanol requires higher activation energy for ignition and so it takes more time to ignite. Spark timing has to be advanced for reducing ignition delay period and misfiring of engine. Increasing number of coils and voltage to increase spark temperature, solve the problem of activation energy required for ethanol and ignition delay. This study was aimed to identify the effect of variable ignition timing on engine performance and exhaust emission of a spark ignition engine. A single cylinder four stroke engine with eddy current dynamometer and artificial ignition system used to investigate the effect of variable ignition timing on performance and exhaust emissions. The test engine was operated with different blend of ethanol-gasoline (E5, E10, E15 and E20). The results have shown considerable performance improvement in brake thermal efficiency and decrease in break specific fuel consumption as well as reduction in HC, CO emission.