FIGURE 1—Here's the relationship between air flow through a venturi and how atmospheric pressure "pushes" fuel into the air stream. At the vena contracta, actual pressure is at a minimum (maximum flow ...
The choke valve in an engine's carburetor, whether it's a Holley carburetor or another brand, helps a cold engine start by restricting some of the airflow into it. When the engine is cold, the choke ...
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