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Chemistry of Engine Combustion Deposits pp 39–52Cite as

Fuel-Related Factors Affecting Engine Octane Requirements

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Abstract

An investigation was undertaken to determine the effect of various engine deposits on octane requirements (OR). Our major finding, namely, that intake valve and intake port deposits can have as great an effect on OR as combustion chamber deposits, has been previously reported.1 It has long been known2 that maldistribution of fuel and air among cylinders of an engine can have a substantial effect on the octane requirements of the cylinders. Hence, it was of interest to determine if engine deposits have an effect on mixture distribution among cylinders (which in turn could affect the octane requirements of the individual cylinders). Accordingly, this paper first discusses the effect of air and fuel distribution among cylinders on octane requirements and then summarizes our overall observations of the effect of fuel factors on OR, using a recent engine test as an example.

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References

  1. L. B. Graiff, “Some New Aspects of Deposit Effects on Engine Octane Requirement Increase and Fuel Economy,” SAE Trans., 88: 3162 (1979); SAE paper 790938.

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  2. E. S. Taylor, W. A. Leary, and J. R. Diver, “Effect of Fuel—Air Ratio, Inlet Temperature and Exhaust Pressure on Detonation,” NACA Report No. 699 (1941).

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  3. L. B. Graiff, W. M. Ehrhardt, and E. J. Haury, “A Device and Technique for Determining the Octane Requirements of Individual Cylinders of an Engine,” SAE paper 801353.

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  4. . D. Frazier and H. F. Hostetler, “Air—Fuel Ratio Control — A Minimal Fix for Octane Ratings Over 100,” SAE paper 285B (1961).

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  5. . L. F. Dumont, “Possible Mechanisms by Which Combustion Chamber Deposits Accumulated and Influence Knock,” SAE Quarterly Trans., 5: 565 (1951).

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  6. . J. Warren, “Combustion Chamber Deposits and Octane Number Requirement,” SAE Trans., 62: 582 (1954).

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  7. T. O. Wagner and L. W. Russum, “Optimum Octane Number for Unleaded Gasoline,” SAE paper 730552.

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Author information

Authors and Affiliations

  1. Fuels Department, Shell Development Company, Houston, Texas, USA

    Leonard B. Graiff

Authors
  1. Leonard B. Graiff
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Editor information

Editors and Affiliations

  1. Exxon Corporate Research Laboratories, Clinton, New Jersey, USA

    Lawrence B. Ebert

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© 1985 Plenum Press, New York

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Graiff, L.B. (1985). Fuel-Related Factors Affecting Engine Octane Requirements. In: Ebert, L.B. (eds) Chemistry of Engine Combustion Deposits. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2469-0_4

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  • DOI: https://doi.org/10.1007/978-1-4613-2469-0_4

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4612-9498-6

  • Online ISBN: 978-1-4613-2469-0

  • eBook Packages: Springer Book Archive

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