Beatrice Lang
Electric chokes are a type of carburettor that automatically opens and closes based on engine temperature. They are designed to provide the correct amount of air and fuel to the engine, ensuring optimal performance and fuel efficiency. Electric chokes are typically controlled by a bi-metal spring that expands when heated, opening the choke, and contracts when cooled, closing the choke. This process is powered by a 12-volt electrical source, which is separate from the engine's heat. While electric chokes offer convenience, they have been known to be less accurate than manual chokes, as they operate on timers. Manual chokes, on the other hand, require more skill to operate but offer greater control over the choke position.
| Characteristics | Values |
|---|---|
| How does an electric choke work? | Electric chokes operate by heating a bi-metal spring with a resistance-heated coil. |
| What happens when the engine is cold? | The choke is closed. |
| What happens when the engine is hot? | The spring warms up and the choke opens. |
| What is the role of the key? | When the key is turned on but the engine is not started, the choke opens, making starting difficult. |
| Where does the heat come from? | An electric choke gets heat from a 12V power source, not the engine. |
| What is the advantage of a manual choke? | More control over when it is on and off. |
| What is the disadvantage of a manual choke? | Requires skill to drive; the driver must manually close it before starting on a cold engine and slowly open it as the engine warms. |
| What is the disadvantage of an electric choke? | They work off a timer and are therefore not very accurate. |
| What is the advantage of a thermostatic "hot air" choke? | It automatically opens and closes in line with the engine temperature, resulting in better drivability, cleaner emissions, better fuel mileage, and longer engine life. |
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What You'll Learn
- Electric chokes require a 12V power source to heat up
- Manual chokes can be harder to operate but offer more control
- Electric chokes are cheaper and easier to set up than manual chokes
- Electric chokes can be inaccurate and choke the engine when not needed
- Electric chokes can be manipulated with a bypass switch
Electric chokes require a 12V power source to heat up
The bi-metal feature of the electric choke begins to heat up when the key is set to either ignition or accessory, causing the choke to open from closed. When the choke circuitry cools, it returns to the closed position. This can be an issue for electric chokes, as they operate on a timer and can sometimes choke the engine when it is not needed. This is less of a problem with manual chokes, which give the driver more control, but they can be harder to use and require more skill.
A thermostatic "hot air" choke is another option that automatically opens and closes in line with the engine temperature, providing a more accurate level of choking. However, this type of choke is more difficult to set up than an electric choke, requiring the hook-up of two air tubes to make a heat riser to the choke cap.
Overall, while electric chokes require a 12V power source to heat up and function, there are several different types of chokes available, each with its own advantages and disadvantages in terms of ease of use, accuracy, and setup.
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Manual chokes can be harder to operate but offer more control
Manual chokes are harder to operate than electric chokes because they require more knowledge and attention from the driver. They are also less accurate because the user has to estimate how much choke to apply. However, they offer more control over the choke, allowing the driver to decide when the choke is on and off. This can be advantageous as electric chokes can sometimes malfunction and choke the engine when it is not needed.
Manual chokes are engaged by pulling a lever, which cuts off the airflow to the engine, creating a more fuel-rich environment in the combustion chamber. This allows the engine to start more easily when it is cold. Once the engine is running, the driver must slowly open the choke as the engine warms up. This process requires careful manipulation of the accelerator to prevent the engine from stalling.
Manual chokes are also more likely to suffer from build-up and engine issues due to their age. They are typically found in classic cars, and dust and grime can affect the movement of the plate. As such, they require regular inspection and cleaning to ensure they are functioning correctly.
While manual chokes offer more control, they require more skill and attention from the driver. They are best suited to drivers who are comfortable with the technology and willing to put in the effort to learn how to use them effectively.
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Electric chokes are cheaper and easier to set up than manual chokes
Electric chokes are generally considered to be cheaper and easier to set up than manual chokes. They are less temperamental and do not require any operator input. Electric chokes are also easier to install, as they only require one wire to be hooked up to function. This is in contrast to manual chokes, which require more knowledge and attention from the driver. Manual chokes can also take a bit of skill to drive, as the driver must manually close the choke before starting a cold engine and slowly open it as the engine warms up.
However, electric chokes do have some disadvantages. They work off a timer, so they are not very accurate and may come on or go off at the wrong times. They can also be problematic when the engine is warm but has been shut off just long enough to cool the choke coil spring, causing the choke to come on when it is not needed.
Manual chokes, on the other hand, offer more control to the driver and are preferred by some people once they get the hang of them. They are also simple, operator-adjustable, and cheap. However, they require a bit of skill and knowledge to operate correctly, and the driver must estimate how much choke to give and when to adjust it.
Ultimately, the choice between an electric and manual choke depends on personal preference and driving habits. Some people prefer the convenience and ease of use of electric chokes, while others prefer the control and simplicity of manual chokes.
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Electric chokes can be inaccurate and choke the engine when not needed
Electric chokes are popular and work very well. They are also easy to install and maintain. However, electric chokes can be inaccurate and choke the engine when not needed. This is because they work off a timer. As such, they sometimes come off too soon, and other times, they choke the engine when it is not even needed.
For example, if the engine is already warm, it may not need to be choked to start. However, if the electric choke circuitry has cooled and moved back to the closed position, the warm engine will be choked as soon as it is started. This is because the choke is a valve that restricts airflow into the carburetor, causing the fuel/air mix to run rich. More fuel flows into the engine when the choke is activated. This is primarily to allow a cold engine to get started and warm up. Once the engine is warmed up, the choke is opened, allowing normal operation.
In contrast, a thermostatic choke automatically opens and closes in line with the engine temperature. This means that it will only choke the engine as much as it needs to, making it much more accurate. However, it is not as easy to set up as an electric choke.
Manual chokes are another alternative. They give the driver control over how much choke to give and when to give it. However, they are also not very accurate and require skill to drive.
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Electric chokes can be manipulated with a bypass switch
For example, a user on NastyZ28.com made a bypass switch under the dashboard that bypasses the oil pressure switch and the ignition switch. By toggling the switch, the user can force the electric choke to heat up and open. This is a "patch" for a bad design, but it works.
Another user on ClassicBroncos.com noted that the choke needs a constant 12 volts while running. The user suggested hooking it up to a switched 12-volt source, and the starter solenoid is probably the easiest place to put it.
A third user on the same forum also noted that the choke needs a constant 12 volts while running and that the right pole on the solenoid is always hot. The user suggested hooking it up to the back of the ignition switch in the dashboard, which is only hot when the ignition is turned on.
It is important to note that manual chokes require some skill to drive. For example, you must manually close a manual choke before starting a cold engine and slowly open it as the engine warms. Additionally, you might have to feather it when accelerating when the engine isn't fully warmed to prevent hesitation and stalling.
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Frequently asked questions
You don't need an electric choke if you live in a warm climate, but you will have longer warm-ups or sluggish cold running.
An electric choke operates by heating a bi-metal spring with a resistance-heated coil. When the engine is cold, the choke is closed. As the engine warms up, the spring warms up and the choke opens.
Electric chokes are cheaper and easier to set up than manual chokes. However, they are not very accurate and may choke the engine when it isn't needed.
Manual chokes give you more control, but they are not very accurate as the user has to estimate how much choke to give. They also take some skill to drive.
Yes, you can convert an electric choke to a manual choke. However, you will need to hook up the electric choke wires for the choke to run properly.
