An evaluation of turbocharging and its effect on emissions was conducted on a 1971 Volkswagen that was equipped with a turbocharger retrofit package that consisted of a new exhaust system, a revised heater system and minor changes to fuel, oil and vacuum lines. The vehicle was a standard model using a four-speed manual transmission. The engine is a four-cylinder air-cooled opposed cylinder with 96 cu. in. displacement. The turbocharged vehicle was tested initially with the air concentration jet in the carburetor plugged and with a high idle CO concentration of 2.5 percent. The carburetor was then adjusted to 0.6 percent idle CO and with stock air correction jet reinstalled. The vehicle was tested without the turbocharger with idle CO set at 0.6 percent. The emission performance of the turbocharged engine was evaluated and its results were compared against the standard engine by using the 1972 Federal test procedure with a constant volume sampling system and the 1970 Federal test procedure using the 7-mode driving cycle. A standard performance test was also run. Results indicate that the turbocharger installation has no adverse effect on emissions when properly installed and adjusted.
A Report on the Exhaust Emissions from a Turbocharged Volkswagen
1971
9 pages
Report
Keine Angabe
Englisch
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