Abstract
Emissions of carbon monoxide, carbon dioxide, oxygen, exhaust opacity, and engine performance were measured upon (1) A 1.4 litre turbo charged Elsbett powered Volkswagen Transporter, running on cold pressed, filtered to 25 microns, unprocessed rape seed oil, compared with running on mineral fuel oil. (2) A 2.4 litre naturally aspirated Toyota Dyna, running on rape methyl ester compared with running on mineral fuel oil. Emissions of carbon monoxide were found to be generally higher with the mineral fuel oil (peak value 0.27%) than with the rape methyl ester (peak value 0.25%) used in the Toyota Dyna, however with the Elsbett engined vehicle running on unprocessed rape seed oil the carbon monoxide emissions were significantly higher than that of the mineral fuel oil (peak values of 0.29% and 0.19% respectively). The emissions of carbon dioxide were similar for both vehicles and for both fuels (typically 11% 14%), whereas oxygen emission was found to be greater with the oil seed rape based fuels (typically 2.5% 3.5%) than with the mineral fuel (typically 0.5% 2.5%), for both vehicles. Exhaust opacity was found to be significantly greater for the mineral fuel oil (typically 40 80 Hartridge smoke units) than the oil seed rape based fuels (typically 20 60 Hartridge smoke units), in the case of the Toyota Dyna running on rape methyl ester the exhaust smoke output was approximately half that of the mineral based fuel.
Published Version
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