Katerina Swanson
A choke fuel line is a component of a carburettor, which is a part of an engine. It is used to restrict the flow of air, creating a richer fuel-air mixture when starting the engine. Chokes are manually or automatically operated, depending on the design of the internal combustion engine. They are also found in other internal-combustion engines, including motorcycles, small propeller-driven airplanes, and riding lawn mowers.
| Characteristics | Values |
|---|---|
| Definition | A choke or choke valve is a component of the carburetor |
| Purpose | To restrict the flow of air so that the fuel-air mixture is made richer when starting the engine |
| Operation | Can be operated manually or automatically by a temperature-sensitive mechanism |
| Design | A solid cylinder (called a "plug" or "stem") that fits inside another cylinder with multiple small holes (the "cage") |
| Use | Nearly universal in automobiles until fuel injection began to replace carburetors |
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What You'll Learn
What is a choke?
A choke, or choke valve, is a component of an engine's carburettor. Its purpose is to restrict the flow of air so that the fuel-air mixture is made richer when starting the engine. This is why it is called a choke, as choking in the violent sense involves cutting off air.
Chokes are manually operated in some internal combustion engines, while in others they are automatic and controlled by a temperature-sensitive mechanism. The latter is called an automatic choke.
A manual choke requires you to operate the butterfly valve. The automatic choke, also called the electric choke, is a butterfly valve that can open or close without input other than the driver’s touching the throttle to “set” the choke on cold start. When not in use, the choke stays in its open position.
Chokes were nearly universal in automobiles until fuel injection began to supplant carburetors. Choke valves are still common in other internal-combustion engines, including most small portable engines, motorcycles, small propeller-driven airplanes, riding lawn mowers, and normally-aspirated marine engines.
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How does a choke work?
A choke or choke valve is sometimes installed in an engine’s carburettor. Its purpose is to restrict the flow of air so that the fuel-air mixture is made richer when starting the engine. This is why it is called a choke: choking in the violent sense involves cutting off air, which is the function of the choke valve.
The choke is an enrichment device found in naturally aspirated engines. It reduces the amount of incoming air without increasing the amount of fuel. When the choke is cranked to the highest level, it attracts the fuel through the idle port and, combined with the reduced air supply, creates the solution needed to start a cold engine.
A manual choke requires you to operate the butterfly valve. The automatic choke, also called the electric choke, is a butterfly valve that can open or close without input other than the driver’s touching the throttle to “set” the choke on cold start. When not in use, the choke stays in its open position.
Chokes were nearly universal in automobiles until fuel injection began to supplant carburetors. Choke valves are still common in other internal-combustion engines, including most small portable engines, motorcycles, small propeller-driven airplanes, riding lawn mowers, and normally-aspirated marine engines.
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What is a choke valve?
A choke valve, also known as a choke, is a component of a carburettor that restricts the flow of air to make the fuel-air mixture richer when starting an engine. Choke valves are often manually operated, but can also be automatic, controlled by a temperature-sensitive mechanism. They are most commonly found in small portable engines, motorcycles, small propeller-driven airplanes, riding lawn mowers, and normally-aspirated marine engines.
The choke is an enrichment device that is critical when starting a cold engine. When the choke is closed, it enriches the air-fuel mixture by reducing airflow, which in turn enriches the fuel supply. This reduction in airflow creates a manifold vacuum, which boosts the fuel through the fuel lines of the vehicle. When the choke is cranked to the highest level, it attracts the fuel through the idle port, creating the solution needed to start a cold engine.
Choke valves are designed to operate at a large pressure drop and a large flow rate for a long time. The most familiar choke design is a solid cylinder (called a "plug" or "stem") that fits inside another cylinder with multiple small holes (the "cage").
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What is the purpose of a choke?
The choke, or choke valve, is a component of the carburettor in an engine. Its purpose is to restrict the flow of air so that the fuel-air mixture is made richer when starting the engine. This is particularly important when starting a cold engine. The choke valve can be operated manually or automatically by a temperature-sensitive mechanism; the latter is called an automatic choke.
Chokes were nearly universal in automobiles until fuel injection began to replace carburetors. Choke valves are still common in other internal-combustion engines, including most small portable engines, motorcycles, small propeller-driven airplanes, riding lawn mowers, and normally-aspirated marine engines.
In the extraction of petroleum (and other heavy-duty fluid handling contexts), a choke valve is an adjustable flow limiter that is designed to operate at a large pressure drop, at a large flow rate, for a long time. The most familiar choke design is a solid cylinder (called a "plug" or "stem") that fits inside another cylinder with multiple small holes (the "cage").
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Where is a choke installed?
A choke or choke valve is a component of the carburettor in an engine. It is designed to restrict the flow of air to make the fuel-air mixture richer when starting the engine. Chokes are nearly universal in automobiles, although they are less common now that fuel injection has begun to replace carburetors. Chokes are still found in other internal-combustion engines, including motorcycles, small propeller-driven aeroplanes, riding lawn mowers, and marine engines.
The choke is an enrichment device found in naturally aspirated engines. It is operated manually or automatically by a temperature-sensitive mechanism. When the choke is closed on a cold start, it enriches the air-fuel mixture by reducing airflow and increasing the fuel supply. This helps to start a cold engine.
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Frequently asked questions
A choke or choke valve is sometimes installed in an engine’s carburettor. It restricts the flow of air so that the fuel-air mixture is made richer when starting the engine.
A manual choke requires you to operate the butterfly valve. The automatic choke, also called the electric choke, is a butterfly valve that can open or close without input other than the driver’s touching the throttle to “set” the choke on cold start. When not in use, the choke stays in its open position.
When you use the choke to temporarily stop the air supply, a manifold vacuum rather than venture vacuum is created, which helps boost fuel through the fuel lines of the vehicle.
