This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Manifold Fuel Film Effects in an SI Engine
Annotation ability available
Sector:
Language:
English
Abstract
A test program was conducted with a carbureted 2.3-liter engine in which a map of engine operating conditions over which intake manifold wall films of appreciable magnitude exist was defined on the basis of visual observations. It was found that the largest maldistributions of fuel/air ratio among the four cylinders of the engine occurred during operation at conditions characterized by the presence of extensive fuel puddles on the intake manifold floor. However, it was also found that while the intake manifold fuel films and puddles could essentially be eliminated by heating the manifold floor, the fuel/air ratio distributions among cylinders under such conditions were virtually identical to those measured under conventional operating conditions. On the basis of these data, it was concluded that the steady-state distribution of fuel among the cylinders was not affected by the presence of liquid films or puddles within the intake manifold but rather that the resulting maldistributions were attributable to other charge stratification effects in the intake flow process.
Recommended Content
Authors
Topic
Citation
Kay, I., "Manifold Fuel Film Effects in an SI Engine," SAE Technical Paper 780944, 1978, https://doi.org/10.4271/780944.Also In
References
- Harrow, G. A. Mills W. D. Thomas A. Finley I. C. “The Vapipe - A Practical System for Producing Homogeneous Gasoline-Air Mixtures.” Paper 760564 SAE Fuels and Lubricants Meeting St. Louis June 1976
- Bond, W. D. “Quick-Heat Intake Manifolds for Reducing Cold Engine Emissions.” Paper 720935 SAE National Fuels and Lubricants Meeting Tulsa November 1972
- Yun, H. J. Lo R. S. Na T. Y. “Theoretical Studies of Fuel Droplet Evaporation and Transportation in a Carburetor Venturi.” Paper 760289 SAE Automotive Engineering Congress and Exposition Detroit February 1976
- Blumberg, P. N. “Powertrain Simulation: A Tool for the Design and Evaluation of Engine Control Strategies in Vehicles.” Paper 760158 SAE Automotive Engineering Congress and Exposition Detroit February 1976
- Pefley, R. K. Boyce A. E. Browning L. H. McCormack M. C. Sweeney M. A. “Characterization and Research Investigation of Methanol and Methyl Fuels in Automobile Engines.” Report ME-76-2 School of Engineering, University of Santa Clara Santa Clara, California June 1976