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The aim of the present work is to develop a rational test method to rate the antiknock performance of unleaded gasolines by measuring the energetic index (I(E)) on current CFR engines. This index expresses the specific power (W/m3) associated with the knocking combustion in an IC engine. Two conventional CFR engines for ASTM RON and MON rating were fitted with a suitable instrumental chain in place of the standard detonation meter and relative magnetostrictive sensor to process the combustion pressure signals. A number of tests performed under 'research' and 'motor' operating conditions on primary reference fuels, clear and CORC fuels, show the existence of a simple relation between I(E) and the compression ratio. Moreover, the new method highlights the better antiknock performance of unleaded gasolines of different composition from the ASTM octane rating. In particular, it provides evidence of the high knock resistance of aromatic components as observed in road tests.

Additional information

Authors: AVELLA F, Stazione Sperimentale per i Combustibili, S. Donato Milanese (IT);GIRELLI A, Stazione Sperimentale per i Combustibili, S. Donato Milanese (IT);FAMIGLIETTI M, CISE SpA, Segrate (IT);CATTANEO F, CISE SpA, Segrate (IT)
Bibliographic Reference: EUR 12742 EN (1990) 70 pp., FS, ECU 7.50
Availability: (2)
ISBN: ISBN 92-826-1449-2
Record Number: 199010973 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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