Total Emissions Control Possible with LP-Gas Vehicle 680529

A 1966 compact van, converted to operate on LP-gas and evaluated under the federal exhaust emissions procedure, approached several definitions of a “pollution-free vehicle.” Specific pollutant results were as follows:
  1. 1.
    The hydrocarbon and carbon monoxide levels of 126 ppm and 0.3%, respectively, were below the 1968 and 1970 emission limits.
  2. 2.
    Certain LP-gas fuel system designs promise to eliminate all evaporative losses.
  3. 3.
    The exhaust hydrocarbons were 70% less reactive than those in gasoline exhaust.
  4. 4.
    Aldehydes, a highly reactive class of exhaust compounds, were low.
  5. 5.
    Oxides of nitrogen were significantly higher with LP-gas because of operation at maximum economy mixtures and maximum power spark advance.
  6. 6.
    The use of a catalytic muffler and rich LP-gas mixtures produced very low oxides of nitrogen levels with other pollutants below the 1968 limits.


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