Compression ratio effects on an ethanol/gasoline fuelled engine performance

José R. Sodré, Rodrigo C. Costa

Research output: Contribution to journalArticlepeer-review


This work investigates the influence of compression ratio on the performance of a spark ignition engine fuelled by a blend of 78% gasoline-22% ethanol (E22) or hydrous ethanol (E100). A 1.0-L, eight-valve, four-cylinder, production engine was tested in a dynamometer bench varying the speed in the range from 1500 to 6500 rev/min. Three compression ratios were investigated: 10:1, 11:1 and 12:1. The performance parameters evaluated were torque, brake mean effective pressure (BMEP), power, specific fuel consumption (SFC), thermal efficiency, exhaust gas temperature and volumetric efficiency. The results showed that higher compression ratios improved engine performance for both fuels throughout all the speed range investigated, with major effects being observed when hydrous ethanol was used.

Original languageEnglish
Pages (from-to)278-283
Number of pages6
JournalApplied Thermal Engineering
Issue number2-3
Publication statusPublished - 1 Feb 2011


  • Compression Ratio
  • Ethanol
  • Fuel Consumption
  • Internal Combustion Engine
  • Thermal Efficiency


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