Experimental investigation of effect of Gasoline-higher alcohol blend on performance characteristic of four stroke Spark Ignition engine at variable compression ratio

This paper investigate the effect of unleaded Gasoline-higher alcohol blends on performance characteristic of single cylinder four stroke Spark Ignition engine at variable compression ratio. Performance tests were conducted at variable compression ratio at constant speed around 2800 rpm. with various blends like gasoline with 5% ethanol (E5), gasoline with 10% ethanol (E10), gasoline with 5% propanol (Pr5), gasoline with10% propanol (Pr10), gasoline with 5% butanol(B5), gasoline with 10%butanol (B10), gasoline with 5%pentanol (P5), gasoline with 10% pentanol (P10) and unleaded Gasoline (E0). Performance characteristics like Break Specific Fuel Consumption and Break Thermal efficiency were calculated at variable compression ratio and compared with E10 and Gasoline. The result showed that 10%vol ethanol-gasoline blends gave best result for all measured parameters.