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Effect of Altitude on Octane Requirement - 1972 Cars
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English
Abstract
The Coordinating Research Council (CRC) conducted a program during the summer of 1972 to determine the decrease in octane number requirement with altitude for current model cars. The study was made because the engines in these cars run hotter and leaner than earlier models, no information was available on altitude corrections for unleaded fuels, and no adjustment was planned for the so-called 91 octane gasolines in the symbol system being developed by ASTM/SAE. Maximum octane number requirements were determined on thirty-nine 1971-1972 model cars, six 1967-1970 model cars, and four light-duty military trucks at sea level, 2000, and 4000 ft on three series of full-boiling range fuels and primary reference fuels. Results indicate that the decrease in octane number requirement per inch of mercury decrease (approximately per 1000 ft) is about two units for 1971-1972 cars and 1.5 units for the 1967-1970 cars and the four military trucks.
Authors
Citation
Bigley, H., Keller, B., and Wusz, T., "Effect of Altitude on Octane Requirement - 1972 Cars," SAE Technical Paper 730551, 1973, https://doi.org/10.4271/730551.Also In
References
- “Effect of Altitude Changes on Octane Number Requirements of Late Model Cars.” Coordinating Research Council Report No. 454 October 1973
- Brinegar C. S. Miller R. R. “Statistical Estimation of the Gasoline Octane Number Requirement of New Model Automobiles.” Technometrics 2 1 February 1960
- “Octane Number Requirement Survey, 1971.” Coordinating Research Council Report No. 448 November 1971
- Brooks D. B. “Effect of Altitude on Knock Rating in CFR Engines.” Jrl. of Research of National Bureau of Standards 28 1942 Research Paper RP 1475
- Gibson H. J. “Factors Affecting Octane Number Requirement.” SAE Quarterly Transactions 3 4 October 1949
- Brenneman A. E. Haines P. L. “The Octane Requirement of Passenger Cars at High Altitudes.” Paper 871 SAE National Fuels and Lubricants Meeting Tulsa November 1956
- Ingamells J. C. Stone R. K. Gerber N. H. Unzelman G. H. “Effects of Atmospheric Variables on Passenger Car Octane Number Requirements.” SAE Transactions 75 1967 paper 660544
- Unpublished Amoco Oil Co. 1961