Labels:text | screenshot | font OCR: If a carburator is designed to meet this requirement, then it is difficult to make it work properly at part load, because of the greatly reduced venturi vacuum available to draw in fuel. A common solution to this problem is to have two sets of venturis, the smaller one used at part throttle, and both operate at full throttle. 2) Difficulty of controlling fuel air ratios over a wide range of operating conditions. For example, for best economy, the engine should burn all the fuel that is introduced to it. This means that the fuel air ratio should be leaner than the stoichiometric ideal. However, for maximum power, (without supercharging), the engine should "burn" all the air. Therefore the fuel air ratio should be richer than stoichiometric when at full throttle. This is usually accomplished ...
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