在其它条件相同时,汽车用汽化器式发动机的功率、经济性、特别是毒性指标均取决于燃烧过程中化学反应的进行情况。此时在燃烧室中由形成的燃烧产物代替了可燃混合气,并放出热量提高了温度和压力。在燃烧混合气变浓和变稀时,发生如下变化;(1)燃烧产物的成份,特别是其中的有毒成份; When other conditions are the same, the power, economy, and especially toxicity index of a carburetor engine for automobiles depend on the progress of the chemical reaction in the combustion process. In this case, the combustible mixture is replaced by the combustion products formed in the combustion chamber and the heat is released to increase the temperature and the pressure. The following changes occur when the combustion mixture is thickened and lean; (1) The composition of the combustion products, especially the toxic components therein;