What is emulsion tube?

Emulsion tube in a carburettor is used to maintain the air fuel ratio at all speeds.It consists of a well with main metering jet at its bottom.The jet has holes on its sides.It is in communication with atmospheric air.Initially air is drawn through the holes into the well and petrol is emulsified.When the throttle …

What is the purpose of an emulsion tube?

The emulsion tube lets air mix with the passing fuel such that a fuel ‘froth’ is sucked into the path of the flowing air. The froth has greater air content at higher air velocity causing a weakening of the mixture and so compensating for the tendency to richness at high air velocity.

How do Weber emulsion tubes work?

The emulsion tube is referred to by Weber as a “brake” which is meant to describe its purpose as a device that slows the flow of fuel from the main jet to the discharge tube in the auxiliary venturi.

How does the emulsion tube work?

The fuel is metered through the main jet while the air is controlled through what is generally called the ‘air correction jet’. Somewhere in between, the fuel and air are intermixed to form an emulsion – a fine dispersant of the air inside the fuel. This is the function of the emulsion tube.

Where is the emulsion tube is provided in Solex carburettor?

During the normal running of a carburetor, fuel is provided by the main jet tube and the air is provided by the choke or venturi tube. Main jet fuel enters into the air bleed emulsion tube present in the carburetor. There is an air correction jet which is used for the correct balance of air and fuel.

What are the 3 types of carburetors?

There are three general types of carburetors depending on the direction of flow of air.

Types of Carburetors.
Constant Choke Carburetor:
Constant Vacuum Carburetor:
Multiple Venturi Carburetor:

When does the emulsion tube play a role?

Under wide-open throttle acceleration the emulsion tube plays little part since the overriding effect is that of the main and air correction jet. At part-throttle however, when the quality of the fuel atomisation arguably has to be significantly better, the emulsion tube can be considered more critical.

How big are the holes in an emulsion tube?

Emulsion tubes are a complex part with diameters and steps in the diameters. Air holes that are drilled at different angles and sizes not to mention how many holes.

Which is the most common emulsion tube for IDF carbs?

Now that you know how the main circuit works and how the tubes affect the main circuit let’s look at the tubes that are for the IDF style carbs. The four main ones that I have played with are F16, F11, F7, and F2. F11. This is the most common tube that comes in IDF carbs. It’s large in diameter so there’s not a lot of room for fuel in the well.