An experimental study of the effect of octane number higher than engine requirement on the engine performance and emissions

Sayin C., Kilicaslan I., ÇANAKCI M., Ozsezen N.

APPLIED THERMAL ENGINEERING, vol.25, no.8-9, pp.1315-1324, 2005 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 8-9
  • Publication Date: 2005
  • Doi Number: 10.1016/j.applthermaleng.2004.07.009
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1315-1324
  • Keywords: spark ignition engine, gasoline, research octane number, specific fuel consumption, exhaust emissions
  • Kocaeli University Affiliated: Yes


In this study, the effect of using higher-octane gasoline than that of engine requirement on the performance and exhaust emissions was experimentally studied. The test engine chosen has a fuel system with carburettor because 60% of the vehicles in Turkey are equipped with the carburettor. The engine required 91-RON (Research Octane Number) gasoline was tested using 95-RON and 91-RON. Results show that using octane ratings higher than the requirement of an engine not only decreases engine performance but also increases exhaust emissions. (C) 2004 Elsevier Ltd. All rights reserved.