The influence of heavy gasoline components on the exhaust emissions of catalyst equipped European vehicles. Part 2 – unregulated emissions

Report no. 95/53: This report extends the investigation published as CONCAWE Report No. 94/59, which studied the influence of gasoline back-end volatility and composition on regulated emissions. This Part 2 report describes the full hydrocarbon andaldehyde/ketone speciation measurements conducted as an integral part of the programme.

The results demonstrated that cars have a much greater effect on speciated emissions than fuel parameters. No consistent trends were observed inspeciated emissions with the less volatile fuels, and the minor fuel effects were more related to fuel composition than back-end volatility. Ozone forming potential was also evaluated.