Beatrice Lang
Edelbrock manufactures carburetors for classic cars and street performance machines, offering both manual and electric choke designs. The manual choke uses a dash-mounted knob to operate a cable to open and close the choke plate, while the electric choke uses a heated coil that expands and contracts to achieve the same function. The electric choke is designed to open and close in relation to engine temperature. This article will explore how to adjust the electric choke cap on an Edelbrock carburetor.
| Characteristics | Values |
|---|---|
| Engine idle speed | 700-900 RPM |
| Fast idle screw | Should not be set too high |
| Throttle cam | Should rest on idle set screw |
| Adjusting cap | Turn until choke closes, then back off until fully open |
| Choke setting | Bring engine to temperature, hold throttle open, loosen set screws, turn adjusting cap, re-tighten cap screws |
| Mixture screw | Turn in while idling until engine stalls |
| Vacuum leak | Check for vacuum leak if engine keeps going |
| Raw fuel dribbling | Use mirror and flashlight to check for raw fuel dribbling |
| Bi-metal spring | Closes choke when cold, forces it to "full open" when warm |
| Choke cover | Loosen adjusting screws and rotate towards "rich" to close choke plate |
| Choke housing | Tap accelerator with key off and car cold to close butterfly |
| Choke temperature | Choke should close on cold engine if temperature is at or below 70 degrees |
| Choke linkage | May require lubrication |
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What You'll Learn
Idle screw settings
Edelbrock carburettors are designed for classic cars and street performance machines. They are typically mounted on top of the engine's intake manifold and feature an air cleaner assembly attached to the top. The idle mixture screws are located on the underside of the carburettor's fuel bowl, near its base.
Adjusting the idle mixture screws involves the following steps:
- Locate the idle mixture screws with the help of a screwdriver.
- Adjust the screws clockwise to restrict airflow and enrich the fuel mixture. This is beneficial for cold starts and improves engine efficiency.
- Rotate the screws counterclockwise to allow more air into the engine, resulting in a leaner fuel mixture. This setting is fuel-efficient and beneficial when the engine is heated.
- After adjusting the choke, tighten the screws and test drive the vehicle.
It is important to note that a misadjusted electric choke can lead to issues such as hard starting, rough idling, and poor fuel economy. Therefore, proper adjustment of the idle mixture screws is crucial for optimal engine performance.
Additionally, the fast idle screw, which regulates the engine's idle speed, is located on the choke housing. Adjusting this screw can help fine-tune the engine's idle behaviour.
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Adjusting the choke cap
Firstly, it is important to understand the function of the choke. The choke plate opens and closes to regulate the air-fuel mixture entering the engine, with a closed choke providing a richer mixture and an open choke providing a leaner mixture. Edelbrock offers both manual and electric choke designs. The manual choke uses a dash-mounted knob to operate a cable that opens and closes the choke plate, while the electric choke uses a heated coil that expands and contracts to achieve the same result.
Before making any adjustments, it is recommended to refer to the Edelbrock website, which provides online user manuals and installation guides specific to your Edelbrock model. These resources offer detailed instructions and visuals to guide your adjustment process.
Now, let's get into the adjustment steps for the electric choke:
- Start by locating the choke housing on your Edelbrock carburettor. It is usually found on the right side of the carburettor and is identified by a black, round disc held in place by three screws.
- Loosen the screws with a suitable tool, but do not completely remove them. This will allow you to access the internal components for adjustment.
- With the choke housing exposed, you can now make adjustments to the choke cap. The choke cap is responsible for controlling the opening and closing of the choke plate.
- Before making any adjustments to the choke cap, it is important to mark its current position. This will serve as a reference point to return the choke cap to its original position if needed.
- To adjust the choke cap, you can rotate it towards the "rich" or "lean" positions. Rotating towards "rich" will close the choke plate, while rotating towards "lean" will force it open. Make these adjustments gradually and observe the choke plate's response.
- Once you have achieved the desired choke plate position, tighten the screws to secure the choke cap in place.
- After adjusting the choke cap, it is important to test the performance of your vehicle. Take the car for a test drive and observe how the engine performs, especially during cold starts and while idling.
- If the car still exhibits performance issues or the choke is not functioning optimally, you may need to make further adjustments. Allow the engine and choke coil to fully cool before making any additional adjustments.
- The ultimate test of your choke adjustment is a test drive the following morning. This is because the engine will be completely cool, and you can assess whether your adjustments are suitable for early morning start-up conditions.
- If further adjustments are required, repeat the above steps and fine-tune the choke cap position until optimal performance is achieved.
Remember, the choke plays a crucial role in the engine's air-fuel mixture, so adjustments should be made gradually and with careful consideration. Always refer to the Edelbrock resources for specific instructions pertaining to your model.
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Bi-metal spring calibration
Edelbrock carburettors are designed for classic cars and street performance machines. They are known to improve engine performance and are compatible with a large number of engine sizes made by different manufacturers. The Edelbrock electric choke employs a heating element to heat a bimetallic spring, which then opens or closes the choke plate based on the engine temperature.
To calibrate the bi-metal spring, you must first warm up the engine to its operating temperature. The choke coil spring tension can then be adjusted. To do this, open the hood of the car and remove the air cleaner. The electronic choke housing is usually located on the right side of the carburettor and has a two-wire hookup. Loosen the screws holding the black disc in place, but do not remove them.
The fast idle screw, which regulates the engine's idle speed, is located on the choke housing. You can adjust the choke setting by bringing the engine up to temperature, holding the throttle open slightly, and loosening the set screws on the choke. Turn the adjusting cap until the choke closes, and then back it off until it fully opens. Re-tighten the cap screws.
It is important to note that the idle speed should be set between 700 and 900 RPM. If the idle speed is too high, it may catch on the fast idle cam and not drop down to the regular idle screw. To fix this, back off the fast idle screw so that the throttle cam can rest on the idle set screw. You can then reset the idle speed and the choke setting.
The only way to tell if the choke is set properly is through trial and error. Test-drive the car and if the car runs properly, no further adjustments are needed. If the performance is still lacking, wait several hours for the engine and choke coil to fully cool before making further adjustments.
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Edelbrock manual instructions
Edelbrock manufactures carburetors for classic cars and street performance machines. They offer two basic models that fit a large number of engine sizes made by different manufacturers.
The manual choke has a dash-mounted knob that operates a cable to open and close the choke plate, while the electric choke uses an electrically heated coil that expands as it heats to open the plate.
To adjust the electric choke, first, open the hood of the car and remove the air cleaner. Locate the black, round disc held in place by three screws on the right side of the carburetor. Two wires are plugged into the disc and provide power to heat the internal coil that expands and contracts to open and close the choke plate. Loosen the screws, but do not remove them.
You can then adjust the choke setting by bringing the engine up to temperature, holding the throttle open slightly, and loosening the set screws on the choke. Turn the adjusting cap until the choke closes, then back it off until it fully opens. Re-tighten the cap screws.
It is important to note that the bi-metal spring in the choke not only closes the choke when cold but also forces it to "full open" when warm. You can loosen the adjusting screws and rotate the cover toward "rich" to close the choke plate or toward "lean" to force it open. Mark the current position of the choke cover so you can return it to the correct position.
The Edelbrock website provides an online manual with detailed instructions on how to set the electric choke, as well as a tuning guide and a description of how the carburetor works and how to tune it. It is recommended to refer to this manual for specific instructions on adjusting the electric choke.
Finally, test-drive the car to determine if the choke is set properly. If the car runs well, no further adjustments are needed. If performance is lacking, wait for the engine and choke coil to cool before making further adjustments. The best way to confirm that the choke adjustments are complete is to test-drive the car the next morning, as the engine will have lost all heat-soak from the previous day, and adjustments will be made based on a cold start.
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Test-driving the car
After adjusting the electric choke cap on your Edelbrock carburetor, it is important to test-drive your car to ensure that your adjustments have been successful and that the choke is set properly. Here is a step-by-step guide to test-driving your car:
Initial Test Drive
First, take your car for a test drive and pay attention to how it performs. The only way to tell if the choke is set correctly is through trial and error. If the car runs properly and there are no issues, then no further adjustments are needed.
Further Adjustments
However, if the car's performance is still lacking, you may need to make further adjustments. Park your car and wait several hours for the engine and choke coil to fully cool down before attempting any adjustments.
Next Morning Test Drive
Before declaring your adjustments complete, it is recommended to perform a test drive the next morning. This is because, after sitting overnight, the engine will have lost all heat-soak from the previous day's drive. The temperature drop overnight will provide a more definitive test for your adjustments, as settings made during the day may not meet the requirements of an early morning start-up.
Fine-Tuning
If issues persist after the next morning's test drive, you may need to fine-tune your adjustments. Refer to the Edelbrock carburetor guidelines for specific instructions on adjusting the electric choke cap. Ensure that your engine is idling correctly, as a proper idle is crucial for optimal choke performance. The ideal idle for an Edelbrock carburetor is around 700 to 900 RPM.
Repeat as Necessary
Continue to test-drive your car and make adjustments as necessary until you achieve the desired performance. Remember that adjusting the electric choke cap is a process of trial and error, and you may need to make multiple adjustments until you find the sweet spot for your specific vehicle.
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Frequently asked questions
First, ensure your engine is idling at 700-900 RPM. Then, loosen the set screws on the choke and turn the adjusting cap until the choke closes. Back it off until it fully opens, then re-tighten the cap screws.
You may need to check for a vacuum leak. If there is no leak, follow the Edelbrock procedure to set the idle mixture and idle speed.
You can download the Edelbrock installation and user manuals from their website. There is also a tuning guide available, as well as a description of how the carburettor works and how to tune it.
