The main components of the gasoline is C and H.The ideal combustion is C + O2 and CO2 (carbon dioxide), 2 h + O - > H2O (water).At the completion of the whole combustion, the air to fuel (F) (A) the weight ratio of 14.7 ~ 14.8.A/F is called the air-fuel ratio, A/F = 14.8 said theory air-fuel ratio.
Combustion in cylinder, along with the gasoline engine working conditions (conditions) is different, have different requirement of air-fuel ratio.Actual air-fuel ratio higher than the theory air-fuel ratio, namely the air more than needed, said gas thin;Actual air-fuel ratio is lower than theory air-fuel ratio, namely the air less than needed, according to gas concentration.Too thick or too thin gas, burning effect is bad, and the combustion rate reduced.Its fuel ratio is about 7, the oxygen to produce stall;Air-fuel ratio is about 20, the result of extinction.Heavy duty air-fuel ratio 12.5 ~ 14.5 g (air) : 1 g (fuel)
Throttle open, rotating speed of engine load down near the maximum torque speed, low inlet velocity is high speed, inlet vacuum degree is lower than high-speed, carburetor oil less than when high speed, but higher combustion temperature, fuel consumption is higher, but the torque is big.
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