SAE technical papers on CD-ROM/SAE technical paper series · 1979 · 16 citations · 3 references
EngineeringAutomotive EngineeringCombustionInternal Combustion EnginesVehicle TestingEmissions TestingEngine EmissionsEngine PerformanceEngine Performance CharacteristicsEngine TestingVehicle EmissionsAutomotive Emission ControlEmission Performance TestingEngine Emissions TestingFuel Effects On EmissionsGasoline Emissions TestingHydrocarbon EmissionsStatistical Experimental DesignTailpipe Emissions
<div class="htmlview paragraph">The effect of the gasoline antiknock additive, MMT, on automotive emission control systems was studied in a 63-car field test. The cars were operated for 50 000 miles, and the effects of MMT on hydrocarbon, CO and NOx emissions, catalyst plugging and spark plug life were determined.</div> <div class="htmlview paragraph">Two concentration levels of MMT in a clear base fuel were studied, 1/32 g Mn/gal and 1/16 g Mn/gal. Seven 1977-78 model year cars, all calibrated to meet California standards, were included in the statistical design.</div> <div class="htmlview paragraph">The results of this study indicate that the use of MMT at either test concentration increases both engine and tailpipe hydrocarbon emissions, compared to clear fuel. At 50K miles, the average tailpipe hydrocarbon increase was 0.09 g/mile for 1/32 MMT fuel, and 0.11 g/mile for 1/16 MMT fuel. This increase was pronounced at low mileage intervals, and significant differences continued for the duration of the test. CO and NO<sub>x</sub> emissions, catalyst plugging, and spark plug life were not affected by MMT.</div>
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