Trystan Casey
Edelbrock offers a range of electric choke kits, such as the Electric Choke Kit #1478, which is designed to convert manual choke Edelbrock Performer series carburetors to electric choke. Setting up an Edelbrock electric choke involves a series of steps, including verifying the voltage, adjusting the choke setting, and lubricating the choke linkage. It is important to refer to the Edelbrock manual for specific instructions, as the process may vary depending on the vehicle and choke model. Some common issues encountered when setting up an Edelbrock electric choke include erratic butterfly opening, failure of the choke and fast idle cam to engage immediately, and a rich mixture after warming up.
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What You'll Learn
- The bi-metal spring: closing the choke when cold, forcing it to full open when warm
- Loosen set screws, turn the adjusting cap to close the choke, then back off to fully open
- Idle settings: no higher than 900 rpm unless the cam is aggressive
- Edelbrock procedure: set the idle mixture and speed
- Choke linkage lubrication: lubricate the linkages with minimal teardown
The bi-metal spring: closing the choke when cold, forcing it to full open when warm
The Edelbrock electric choke is a critical component that adjusts the combination of air and fuel during cold starts. It inhibits air entry into the carburetor, thereby increasing the quantity of gasoline in the mixture. The choke employs a heating element to heat a bimetallic spring. The bi-metal spring not only closes the choke when cold but also forces it to "full open" when warm.
The bi-metal spring is heated by a 12V wire connected to the choke. When the key is turned to 'RUN', the resistance heater begins to warm the spring and the choke slowly opens. The bi-metal spring has a small loop at the end that captures the linkage tab. The choke plate should be closed by loosening the adjusting screws and rotating the cover toward "rich". Conversely, rotating it towards "lean" will force the choke plate open.
The Edelbrock manual provides a detailed procedure for setting the electric choke. It is recommended that you warm the engine to operating temperature before adjusting the choke coil spring tension. The choke coil spring tension can be adjusted by opening the hood and locating the Edelbrock carburetor. The carburetor is usually mounted on top of the engine's intake manifold. The choke housing can be found on the carburetor's right side and features a two-wire hookup.
The bi-metal spring plays a crucial role in the proper functioning of the Edelbrock electric choke. By responding to temperature changes, the spring ensures the choke is closed when cold and fully open when warm, optimizing the air-fuel mixture for engine performance.
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Loosen set screws, turn the adjusting cap to close the choke, then back off to fully open
Loosen the set screws on the choke. This should be a simple process, but be careful not to drop any small screws into the carb. Then, turn the adjusting cap to close the choke. This is the point at which you can reset the fast idle screw if it was previously set too high. Once the choke is closed, back off the adjusting cap until the choke is fully open. Finally, re-tighten the cap screws.
It is important to note that the choke should be fully open when warm. When cold, there should be about a credit card width gap, and when hot, there should be about a 1/4 gap before the choke is fully open. The bi-metal spring in the choke cover will force the choke to close when cold, and to fully open when warm. You can loosen the adjusting screws and rotate the cover towards "rich" to close the choke plate, and towards "lean" to force it open.
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Idle settings: no higher than 900 rpm unless the cam is aggressive
Edelbrock carburettors with electric chokes are designed to be set at idle speeds of 700-900 RPM. However, some Edelbrock carburettor owners have reported idle speeds of up to 1500 RPM. This is considered very high, and most cars will idle at around 900 RPM.
If you have a very aggressive cam, you may need to set your idle speed higher than 900 RPM. For example, one user with a Chevy Nova reported that their car was idling at 1100 RPM after having work done on it, and when they asked about lowering the idle, they were told that low idle speeds can ruin the engine in cars with big cams. However, another user with a similar car disagreed, saying that they should be able to lower the idle to 800-900 RPM or even lower.
To adjust the idle speed on an Edelbrock carburettor with an electric choke, you can try the following:
- Bring the engine up to temperature, then hold the throttle open a little.
- Loosen the set screws on the choke.
- Turn the adjusting cap until the choke closes, then back it off until the choke fully opens.
- Retighten the cap screws.
It's important to note that adjusting the idle speed on a car with an Edelbrock carburettor may require some experimentation to find the setting that works best for your particular vehicle.
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Edelbrock procedure: set the idle mixture and speed
Firstly, it is important to note that Edelbrock electric choke adjustment is a complicated process that is necessary to avoid poor car performance. It is a process of adjusting the tension on the choke coil spring. These procedures will ensure the electronic choke operation.
To set the idle mixture, you must first locate the idle mixture screws on the carburetor. They are normally located on the underside of the carburetor's fuel bowl, near the base. Use a screwdriver to adjust them. Turning the screws clockwise will restrict the quantity of air reaching the engine, increasing the richness of the fuel mixture. This will improve engine efficiency and lower emissions, especially on cold starts. Rotating the screws counter-clockwise will allow more air into the engine, resulting in a leaner fuel mixture. This will improve fuel efficiency and lower emissions while the engine is heated.
After adjusting the choke on a carburetor, it is important to tighten the screws and test-drive the car. If the car runs correctly and starts readily, no additional modifications are required.
To set the idle speed, follow the Edelbrock manual instructions: set the speed to the desired RPM with the Air Screw. There are two steps in setting the idle speed. First, set the idle at whatever RPM you want. Then adjust the idle "AIR/fuel" mixture screws. As you adjust these, the RPM will go up or down.
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Choke linkage lubrication: lubricate the linkages with minimal teardown
Lubricating the linkages without a teardown is an important step in choke maintenance. Proper lubrication helps to ensure that the linkages move freely and do not suffer from damage due to friction and wear. It also helps to extend the lifespan of the linkages and prevent costly repairs.
There are several ways to lubricate choke linkages without a teardown. One method is to use a motorcycle cable luber, a short sleeve that clamps around the bare end of the cable and the outer sheath. An aerosol can of cable lube is then squirted into the luber, injecting the lubricant into the cable housing without the need for disassembly.
Another approach is to spray a lubricant, such as silicone spray, directly onto the outside of the cable. This method has been found to be effective in improving the performance of the linkages.
Additionally, some individuals have reported success by working oil into the cable with a rag, particularly if the sheath is not covered in plastic.
It is important to note that not all cables should be lubricated. Some throttle and choke cables have nylon or Teflon liners, and these should not be lubricated as the liner serves the purpose of lubrication.
For Edelbrock electric choke settings, it is recommended to refer to the Edelbrock website, which provides an online manual with detailed instructions on how to set the electric choke, including choke settings and tuning guides. This resource can provide specific guidance for your Edelbrock model.
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Frequently asked questions
Download the Edelbrock manual for a detailed description of how to set the electric choke. You can also try bringing the engine up to temperature, holding the throttle open a little, loosening the set screws on the choke, turning the adjusting cap until the choke closes, and then backing it off until it fully opens.
Verify that you have 12V at the choke housing. If you do, the choke linkage may be binding. Try playing with the high idle linkage. If that doesn't work, you may need to lubricate the choke linkage.
All the Edelbrock forum sites state to leave about a credit card width when cold. You can also try calibrating the bi-metal spring and marking where the "hook" forces the choke to close when cold.
Try setting a faster idle. If that doesn't work, slowly turn each mixture screw while the engine is idling until the engine stalls out. If the engine keeps going, you have a vacuum leak.
