Effects of Ambient Conditions on the Emissions of a Small Carbureted Four-Stroke Engine

Paper #:
  • 961739

Published:
  • 1996-08-01
Citation:
Brereton, G., DeAraujo, A., and Bertrand, E., "Effects of Ambient Conditions on the Emissions of a Small Carbureted Four-Stroke Engine," SAE Technical Paper 961739, 1996, https://doi.org/10.4271/961739.
Pages:
12
Abstract:
The exhaust-gas emissions of a small four-stroke, carbureted, single-cylinder spark-ignition engine have been studied as functions of ambient conditions, using gasoline as the fuel. In steady-state dynamometer tests at fixed engine speeds/loads, carried out under different climatic conditions, the concentrations of exhaust-gas components have been measured. Their dependence on ambient conditions has been analyzed principally in terms of the influence of ambient temperature, pressure, and humidity on the air-fuel ratio metered by the carburetor. While the air-fuel ratio of carbureted utility engines at fixed loads varies by only a small percentage during modest changes in ambient air conditions, these changes can correspond to significant changes in the production of regulated pollutants. Using a correction for air mass flow and fuel density at wide open throttle, the scatter in observed air-fuel ratio and % CO data could be reduced by about one third.
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