This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Emission System Upgrades for Older Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1996 by SAE International in United States
Annotation ability available
Thirteen 1975-1980 model year vehicles were equipped with a set of components to upgrade their emission control systems. Each vehicle was tested before maintenance (as-received), after tune-up and correction of original equipment emission system defects (baseline), and after installation of the emission upgrade system (upgrade). Average emissions of non-methane hydrocarbons (NMHC), carbon monoxide (CO), and nitrogen oxides (NOx) with the emission upgrade system installed were reduced more than 60% from the baseline immediately after upgrade.
Six of the vehicles accumulated 48,000 kilometers with the upgrade system. After 48,000 kilometers, average emissions of NMHC and NOx were still reduced approximately 50% compared to the baseline and average emissions of CO were reduced approximately 20%.
CitationCarlson, R., Finkenbiner, K., and Sommerville, R., "Emission System Upgrades for Older Vehicles," SAE Technical Paper 960062, 1996, https://doi.org/10.4271/960062.
- Dickenson, E.L., Henning R. C., and Stone W. R., “Evaluation of Vehicle Emissions from the Unocal SCRAP Program,” Radian Corporation, Sacramento, California, Prepared for Unocal Corporation, June 19, 1991.
- California Air Resources Board, “Predicted South Coast Vehicle Emissions”, August 18, 1990.
- Spiegel, M. R., “Statistics,” McGraw-Hill Book Co., 1961.
- California Department of Motor Vehicles, “Vehicles Currently Registered, Year First Sold Report.” Sacramento, California, January 1994.
- California Air Resources Board, “Mobile Source Emission Reduction Credits,” February 1994, pages 28-29.