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Effect of Octane Number on the Performance of Euro 5 and Euro 6 Gasoline Passenger Cars

BP International Ltd.-John Williams
Concawe-Heather D. Hamje, David J. Rickeard
Published 2017-03-28 by SAE International in United States
Research Octane Number (RON) and Motor Octane Number (MON) are used to describe gasoline combustion which describe antiknock performance under different conditions. Recent literature suggests that MON is less important than RON in modern cars and a relaxation in the MON specification could improve vehicle performance. At the same time, for the same octane number change, increasing RON appears to provide more benefit to engine power and acceleration than reducing MON. Some workers have advocated the use of an octane index (OI) which incorporates both parameters instead of either RON or MON to give an indication of gasoline knock resistance. Previous Concawe work investigated the effect of RON and MON on the power and acceleration performance of two Euro 4 gasoline passenger cars during an especially-designed acceleration test cycle. A large number of fuels blended with and without oxygenates and ranging from around 95 to 103 RON and sensitivities (RON minus MON) up to around 15 were tested. The results were vehicle dependent but in general, showed that sensitivity and octane index appear to be…
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Blending Octane Evaluation of Fuel Ethers: A Literature Review

Ecofuel S.p.A.-Marco Di Girolamo
Evonik Industries AG-Oliver Busch
Published 2016-04-05 by SAE International in United States
A thorough bibliographic survey was carried out to collect literature-available information about blending octane numbers (BONs) of most widely used ethers by the refining industry (mainly MTBE and ETBE). The intention was to review the publicly reported BONs values, to suggest the most appropriate figures for future reference, while also understanding the causes of the differences.Summary tables feature all BON values, either explicitly reported in literature or calculated based on experimental results.Due to synergistic intermolecular interactions with hydrocarbons, BONs typically depend on base stock composition.The octane gain tends to grow as the paraffin content in the base stock increases. Moreover BONs tend to decrease as the octane numbers (ON) of the base stock increase.From a refining industry practical utilization viewpoint, the relevant BONs to be considered should logically be those referring to a typical on-spec gasoline composition (relevant “cluster”), while atypical base stock formulations add a wider scientific dimension.The average values presented in this review have been obtained by normalizing the cluster sub-set of literature-featured blending Octane Numbers of the four ethers. Such figures should…
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Ethyl Tertiary Butyl Ether - A Review of the Technical Literature

SAE International Journal of Fuels and Lubricants

European Fuel Oxygenates Association-Graeme Wallace
Evonik Oxeno-Ekkehard Schulte-Körne
  • Journal Article
  • 2009-01-1951
Published 2009-06-15 by SAE International in United States
Ethyl tertiary butyl ether (ETBE) has been used as a high octane blending component since the early 1990's. However the strong interest in renewable energy has led to a dramatic increase in its use. This has also resulted in a substantial number of technical studies being carried out around the world to assess its performance with respect to vehicle performance, distribution system compatibility, environmental impact and toxicology. The purpose of this paper is to provide a comprehensive, up to date review of these data. Particular focus will be given to its positive impact on CO2 emissions.
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