Technical Paper
Assessment of Unregulated Emissions from Gasoline Oxygenated Blends
1990-10-01
902131
Four gasoline or gasoline-oxygenate blend fuels were used in the evaluation of regulated and unregulated emissions from five test vehicles. The fuels listed below were prepared from a common base gasoline. Baseline, aromatic-enriched (35.5% aromatics) 10% Ethanol blend (3.5% oxygen) 16.4% Methyl tertiary-butyl ether (MTBE) blend (3.0% oxygen) 19.1% Ethyl tertiary-butyl ether (ETBE) blend (3.0% oxygen) The five test vehicles represented different types of emission control technology: pre-catalyst, oxidation catalyst, three-way catalyst with closed-loop carburetor operation and an air pump, three-way catalyst with throttle body fuel injection, and three-way catalyst with port fuel injection. Each vehicle was operated with each fuel over the Federal Test Procedure(1)* (including evaporative emissions) for a total of 15 tests per vehicle.