A STUDY OF MIXTURE DISTRIBUTION

Such design features as the position of the choke valve and its mounting, and any other obstructions in the air passage, can alter the quantitative mixture distribution patterns more than reasonably large changes in engine speed, mixture temperature, or fuel volatility.

The lightest components of fuels are unevenly distributed, as well as the heavier materials.

The antiknock quality of the fuel reaching each cylinder depends, to a large extent on the variation in octane quality with boiling range of the original fuel, and this quality can be controlled to a considerable extent by maintaining even quality between the light and heavy fractions of the fuel.