Compositional effects of gasoline fuels on combustion, performance and emissions in engine

Ahfaz Ahmed, Muhammad Waqas, Nimal Naser, Eshan Singh, William L. Roberts, Suk Ho Chung, Mani Sarathy

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Commercial gasoline fuels are complex mixtures of numerous hydrocarbons. Their composition differs significantly owing to several factors, source of crude oil being one of them. Because of such inconsistency in composition, there are multiple gasoline fuel compositions with similar octane ratings. It is of interest to comparatively study such fuels with similar octane ratings and different composition, and thus dissimilar physical and chemical properties. Such an investigation is required to interpret differences in combustion behavior of gasoline fuels that show similar knock characteristics in a cooperative fuel research (CFR) engine, but may behave differently in direct injection spark ignition (DISI) engines or any other engine combustion modes. Two FACE (Fuels for Advanced Combustion Engines) gasolines, FACE F and FACE G with similar Research and Motor Octane Numbers but dissimilar physical properties were studied in a DISI engine under two sets of experimental conditions; the first set involved early fuel injection to allow sufficient time for fuel-air mixing hence permitting operation similar to homogenous DISI engines, while the second set consists of advance of spark timings to attain MBT (maximum brake torque) settings. These experimental conditions are repeated across different load points to observe the effect of increasing temperature and pressure on combustion and emission parameters. The differences in various engine-out parameters are discussed and interpreted in terms of physical and thermodynamic properties of the fuels.

Original languageEnglish (US)
Pages (from-to)460-468
Number of pages9
JournalSAE International Journal of Fuels and Lubricants
Issue number3
StatePublished - Jan 1 2016

Bibliographical note

Publisher Copyright:
© 2016 SAE International.

ASJC Scopus subject areas

  • Pollution
  • Fuel Technology


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