• Air is controlled by the throat drawing in air from the velocity stacks which straighten the column of air. The first thing the air meets is the venturi. It "chokes" down the column of air and thusly increases its speed as it encounters the same size opening after the venturi it had as it entered. Example: lets say air entering carburetors is giving 10 mph with " venturi effect " the air is going 12 mph after the venturi.

• The fuel that is mixed with the air as it travels through the carb is first given out on the other side of the butterfly through the idle volume mixture screw hole, the more you turn the screw out the less it obstructs the hole, thus more fuel can enter the engine.

• There are three very small progression holes just above the butterfly, as the butterfly opens up these holes emitting fuel are exposed to the sucking of the engine. As the butterfly is opened even further more air is being drawn into the engine as fuel mixed with air ( the air is regulated by the air correction jets and emulsion tubes ) is being drawn through the main jets.

• The idle jet should be called the "progression jet " because it controls the amount of fuel going to the 3-progression holes in your Porsche carburetors.

• The last mechanism of the Porsche carburetor operations is the accelerator pump. Like the butterfly the accelerator pump is controlled by the gas pedal. In each throat the accelerator pump is simply a " squirt gun " squirting raw fuel into the carburetor throat.

As you can see a lot of different functions are needed to enable the Porsche engine to operate under a wide variety of R.P.M.s.

Double Click the Thumbnails Below for Rebuilding Process
 

Zenith (Solex) Carburetors

Motor Meister Inc. 12262 Woodruff Avenue Downey, California 90241

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