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Octane Number Requirement Trends-Passenger Cars In U.S., 1965-1974
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English
Abstract
Annually, the Coordinating Research Council (CRC) sponsors a nationwide survey of octane number requirements for current model passenger cars. In this review, based on surveys from 1965 through 1974, trends in octane number requirements reflect changes in engine design and exhaust systems to meet the legislated limits on emissions.
The average requirement dropped approximately 5.5 Research octane numbers over the ten-year period with the most dramatic drop of approximately 3.0 octane numbers in 1971 when car manufacturers recommended use of 91 octane gasoline. The trends toward lower average requirements since 1971 have been determined with both leaded and unleaded fuels. Incidence of surface ignition knock and rumble was about one per cent in 1965 and tended to disappear after 1971. The average spread of octane number requirements between 10 and 90 per cent of cars satisfied increased about 2.5 numbers over the period.
Authors
Citation
Barnard, D., Rogers, J., and Wascher, W., "Octane Number Requirement Trends-Passenger Cars In U.S., 1965-1974," SAE Technical Paper 750934, 1975, https://doi.org/10.4271/750934.Also In
References
- Octane Number Requirement Survey 1965 CRC Project No. CM-56-65
- Octane Number Requirement Survey 1966 CRC Project No. CM-61-66
- Octane Number Requirement Survey 1967 CRC Report No. 418
- Octane Number Requirement Survey 1968 CRC Report No. 423
- Octane Number Requirement Survey 1969 CRC Report No. 434
- Octane Number Requirement Survey 1970 CRC Report No. 446
- Octane Number Requirement Survey 1971 CRC Report No. 448
- Octane Number Requirement Survey 1972 CRC Report No. 464
- Octane Number Requirement Survey 1973 XRC Report No. 467
- Octane Number Requirement Survey 1974 CRC Project No. CM-101-74
- Fitch F.B. Thena R.H. “Fuel Requirements of Passenger Cars Throughout the World,” SAE Detroit, Michigan January 1969
- Motor Gasoline Surveys Bureau of Mines U.S. Department of the Interior
- Monthly Gasoline Surveys Ethyl Corp.
- Gasoline Surveys E.I. DuPont deNemours Co.
- Data Gathering and Analysis Methods Octane Number Requirement Surveys CRC Project No. CM-53-64 February 1966
- Brinegar C.S. Miller R.R. “Statistical Estimation of the Gasoline Octane Number Requirement of New Model Automobiles,” Technometrics 2 l February 1960