Nuthan, Prasad, B.S.Pandey, J.K.Kumar, G.N.2020-03-312020-03-312020Energy, 2020, Vol.191, , pp.-https://idr.nitk.ac.in/handle/123456789/11531In the present investigation, experiments were conducted in wide open throttle condition (WOT) for different speed ranging from 1200 rpm to 1800 rpm at an interval of 200 on a single-cylinder four-stroke variable compression ratio (VCR) SI engine. The engine fueled with equi-volume blend of methanol/gasoline fuel, while 14 BTDC ignition timing is maintained for all three different compression ratios (8, 9 & 10). Increasing the compression ratio from CR8 to CR10 for the methanol/gasoline blend has improved combustion efficiency by increasing the peak pressure and net heat release value by 27.5% and 30% respectively at a speed of 1600 rpm. The performance results show a good agreement of improvisation of 25% increase in BTE, and BSFC reduction by 19% at compression ratio 10:1. At higher compression ratio 10:1, there was a significant decrease observed in CO and HC by 30 40%, and the same trend is observed at all speeds; however, NOx emission increased with the increasing CR. 2019 Elsevier LtdArticle