Investigations of unleaded fuels for Otto-engines with different octane number improving components with respect to knocking, fuel consumption and exhaust emissions
Investigations of fuels blended with different octane number improving fuel components have been made on a four-cylinder engine for different compression ratios. The results for all investigated compression ratios indicate that any of the investigated components - methanol, ethanol, MTBE, and TAME - improve the knock resistance of the selected basis fuel of RON 95, representing current unleaded European premium gasoline quality. The amount of improvement increases with the blending rate and was of the same level for all components at equal blending rates. At the high compression ratios of 11.5:1 and 12.4:1 especially, the better fuel quality of the blended fuels leads to an increase in efficiency and power output of the engine at the knock limit, compared with the result of the selected basis fuel at the serial compression ratio of 9.8:1. Exhaust emission shows a tendency to better NO and HC emissions with increased blending rate, especially for the methanol blendings. In comparison with the engine results at the knock limit of the basis fuel and the serial compression ratio, better specific NO emissions were obtained for the blended fuels at their individual knock limits at the higher compression ratios.
Bibliographic Reference: EUR 12306 EN (1989) FS, 62 pp., ECU 6.25
ISBN: ISBN 92-826-0801-8;CD-NA-
Record Number: 198911163 / Last updated on: 1994-12-01
Original language: en
Available languages: en