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The Influence of Cooling System Variables
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English
Abstract
A vehicle fleet test has been conducted to determine if octane advantages due to selected cooling system variables persist with stabilized deposits. The variables tested were reduced coolant temperatures, a direct substitution of aluminum for the iron cylinder head and an aluminum head with Unique Cooling. Octane requirements, octane requirement increase (ORI), emissions and fuel economy results are presented and discussed.
Engine tests to determine the sensitivity of octane to independently controlled engine temperatures confirmed the primary dependence upon coolant temperature. Additional tests identified some of the variables which cause octane differences among the cylinders of one engine and between engine families.
Authors
Citation
Daly, D., Anderson, R., and Baker, R., "The Influence of Cooling System Variables," SAE Technical Paper 780595, 1978, https://doi.org/10.4271/780595.Also In
References
- Keller B. D. Meguerian G. H. Smith J. B. Tracy C. B. “ORI of Today's Vehicles - Part II.” SAE Paper No. 770195 International Automotive Engineering Congress and Exposition Detroit, Michigan February 28 March 4 1977
- Saillant R. B. Pedrys F. J. Kidder H. E. “More Data on ORI Variables.” SAE Paper No. 760196 SAE Automotive Engineering Congress and Exposition Detroit, Michigan February 23-27 1976
- Ernest R. P. “A Unique Cooling Approach Makes Aluminum Alloy Cylinder Heads Cost Effective.” SAE Paper No. 770832 Passenger Car Meeting Detroit, Michigan September 26-30 1977
- Niles H. T. McConnell R. J. Roberts M. A. Saillant R. “Establishment of ORI Characteristics as a Function of Selected Fuels and Engine Families.” SAE Paper No. 750451