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An Approach To Obtaining Road Octane Ratings In A Single-Cylinder Engine
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Abstract
An approach to obtaining laboratory single-cylinder engine fuel octane ratings that agree with car road octane ratings is described.
The technique is based on attaining, in the single-cylinder engine, a general duplication of the combustion environment which exists in the multicylinder automotive engine. Because it proved suited to this purpose, a special single-cylinder power section mounted on a CFR crankcase was used. The influence of speed on fuel borderline ratings was in substantial agreement with automotive engine results.
Results were obtained on a variety of commercial gasolines and special blends representing extreme variations in hydrocarbon composition. Comparative rating work covered a variety of 1947–1952 and 1955 cars; automotive engine compression ratios ranged from 6.5 to 9.0, and ratios of 10, 11, and 12 were obtained with special engines, heads, and pistons. For fuels of 68 to 105 octane number, single-cylinder engine ratings agreed with car ratings with a maximum spread of three Octane units. In contrast to this, the ASTM Research and Motor ratings deviated by as much as 10 octane units.
Authors
Citation
Barber, E., Wilson, H., and Randall, T., "An Approach To Obtaining Road Octane Ratings In A Single-Cylinder Engine," SAE Technical Paper 570019, 1957, https://doi.org/10.4271/570019.Also In
References
- ASTM Designation D908-55
- ASTM Designation D357-53
- “Relation between Road and Laboratory Knock Ratings,” Dupkworth, J. B. Moore, G. T. and Domke C. J. Presented at ACS Symposium on Relationship of Fuel Properties to Engine Design and Future of High Octane Fuels Sept. 6–10 1948
- SAE Transactions Vol. 43 1938 416 420 “Correlation of Road and Laboratory Octane Numbers,” Sabina J. R.
- Proceedings of the API Vol. 3 November 1937 98 111 “1937 Road Knock Tests: Report from Cooperative Fuel Research Committee,” Boyd T. A.
- SAE Transactions Vol. 30 1935 165 179 “CFR Committee Report on 1934 Detonation Road Tests,” Veal C. B.
- SAE Transactions Vol. 28 1933 104 “Antiknock Research Coordinates Laboratory and Road Tests,” Veal, C. B. Best, H. W. Campbell, J. M. Holaday W. M.
- Petroleutm Processing, August 1951 “Road Antiknock Performance of Motor Gasolines,” Alspaugh M. L. Hall C. A.
- 198 212 “Chemical Background for Engine Research,” Frock, E. F. Rossini, F. D. Whitmore, F. C. von Elbe, G. Lewis, B. Beech O. Interscience Publishers, Inc. New York 1943
- “La Combustion Détonante dans les Moteurs à 1’ Explosion,” Serruys M. Pub. Sci. and Tech.
- NACA TR 655 1939 “Knocking Characteristics of Fuels in Relation to Maximum Permissible Performance of Aircraft Engines,” Rothrock A. M. Bierman A. E.
- NACA ARR E6E13 1946 “Correlation of the Effects of Compression Ratio and Inlet Air Temperature on Knock Limits of Aviation Fuels in a CFR Engine II,” Alquist, H. E. O'Dell, L. Evvard J. C.
- Proceedings of the API Vol. 3 June 1947 103 115 “Some Characteristics of Combustion in. ASTM-CFR Knock Test Engine,” Barber, E. M. Endsley, L. E. Jr., Randall T. H.
- SAE Quarterly Transactions Vol. 2 July 1948 401 411 “Knock-Limited Performance of Several Automobile Engines,” Barber E. M.
- ASTM Designation D909-49T
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- CRC Designation F-8A-943