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Quick-Heat Intake Manifolds for Reducing Cold Engine Emissions
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English
Abstract
This report presents some design parameters and development experience on quick-heat intake manifolds for evaporating the fuel. These can achieve good fuel evaporation soon after a cold start. Used in conjunction with a fast-opening choke, such a quick-heat intake manifold helps reduce carbon monoxide (CO) emissions. This is especially effective on cars with catalytic converters, since CO caused by cold enrichment is produced at a time when the catalyst is not yet hot and effective.
The sensitivity of one design of quick-heat intake manifold to fuel volatility characteristics is included. A variety of ways to correlate drivability with the ASTM distillation characteristics of the fuel are evaluated.
Authors
Citation
Bond, W., "Quick-Heat Intake Manifolds for Reducing Cold Engine Emissions," SAE Technical Paper 720935, 1972, https://doi.org/10.4271/720935.Also In
References
- Tamura Z. Yanasawa Y. “Evaporation and Combustion of a Drop Contacting with a Hot Surface.” Seventh Symposium (International) on Combustion London and Oxford, England Butterworths Scientific Publications Aug. 28 Sept. 3 1958
- Branschweig, Loehner K. “Mixture Formation in the Gasoline Engine.” Abridged article by ATZ 62 April 1960
- Wiers W. W. Scheffler C. E. “Carbon Dioxide (CO 2 ) Tracer Technique for Modal Mass Exhaust Emission Measurement.” Paper 720126 SAE Automotive Engineering Congress Detroit January 1972
- Howell J. “A Least-Square-Distance Curve-Fitting Technique.” NASA paper TN D-6374 July 1971