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Venturi
What is a venturi?
Have you ever noticed that the wind blowing through a narrow space between two buildings always seems to be much stronger than in the open? In other words, the velocity is greater. The same thing can be seen in a river. The current is
always faster in a narrow, shallow place than in the deep wide pools. In a fashion, these narrow places are ventures.
The great bulk of air or water suddenly forced through a constructed space has to accelerate in order to
maintain the volume of flow.
This is the way a venturi is placed in a carburetor. The shape is carefully designed to produce certain air flow patterns.
Airfoil
Now, what is an airfoil?
Here is a picture of a tube in an air stream. When still, the pressure is equal on all sides. Under movement, an air pattern is formed. so that we have a high pressure area and a very low pressure area.
Now all this apply to small gas engines that
may employ one of four types of carburetors, the Flo-Jet (gravity feed or float type), the Vac-Jet (suction feed), the newer Pulsar-Jet (fuel pump) or the Mikuni type carburetor.
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