“A Study of Factors Affecting Carburetor Performance at Low Air Flows” 690137

Carburetor repeatability at idle was investigated both on the carburetor precision flow stand and on a chassis dynamometer equipped with exhaust emission test equipment. It was determined that some factors which significantly affect idle fuel flow repeatability on the carburetor test stand are:
  1. 1
    Surface roughness of mating parts in the fuel bowl inlet system.
  2. 2
    Inlet valve eccentricity.
  3. 3
    Hydraulic shock in the fuel supply circuit.
In addition, vehicle testing had demonstrated that carbon monoxide changes at idle may occur with constant fuel-air ratio due to changes in fuel temperature. Cycle tests have also shown a relationship between fuel temperature and carbon monoxide levels.


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