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The Weber 32/36 is a carburettor that works on a range of engines, from Spits to 510 Datsuns. It has a forgiving design, but it's important to ensure that the jetting is set correctly. The Weber 32/36 typically does not have a return line or a fitting for one. Some users have discussed adding a fuel return line, but it is not a necessity. The fuel inlet size is a topic of discussion, with some sources suggesting a nipple size of 5/16. There is also a debate about whether a fuel regulator is required, with some users experiencing issues with idle drop and stalling, which may be related to fuel pressure.
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What You'll Learn
The nipple size is 5/16
The nipple size for the Weber Progressive 32/36 carburettor is indeed 5/16". This measurement refers to the diameter of the fuel line nipple, which is a critical component in the fuel delivery system of the carburettor. Ensuring the correct nipple size is essential for optimal fuel flow and engine performance.
The Weber Progressive 32/36 carburettor is a popular performance upgrade for a variety of engines, particularly those in classic cars and racing applications. It features a progressive, two-barrel design, providing improved throttle response and power delivery compared to a single-barrel carburettor. This makes it a popular choice for enthusiasts looking to enhance the performance of their vehicles.
The fuel line nipple is a small but vital component within the carburettor. It is responsible for delivering fuel from the fuel line to the carburettor, ensuring the correct amount of fuel is mixed with the air for proper engine operation. Given the importance of this function, it is crucial that the nipple size matches the fuel line size to ensure unrestricted fuel flow.
With a 5/16" nipple size, the Weber Progressive 32/36 carburettor is designed to work with fuel lines of the same diameter. This fuel line size is common in automotive applications, making it convenient for those installing this carburettor in their vehicles. It's important to note that using a fuel line with an incorrect diameter can lead to issues such as restricted fuel flow, which can negatively impact engine performance and fuel efficiency.
In addition to the nipple size, it's worth noting that the quality of the fuel line is also important. It is recommended to use a fuel line that is resistant to corrosion and capable of withstanding the pressures and temperatures present in the engine bay. Ensuring the fuel line is in good condition and free from cracks or leaks is vital to maintaining the safety and reliability of the vehicle.
When installing the Weber Progressive 32/36 carburettor, paying attention to the fuel line nipple size and using the correct fuel line will help ensure optimal performance and reliability. With the correct fuel delivery, this carburettor can provide the intended performance benefits, making it a worthwhile upgrade for enthusiasts seeking improved throttle response and power output. Keeping the fuel line well-maintained is also essential to preserve the longevity of the engine.
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The Weber 32/36 usually does not have a return line
The Weber 32/36 is a carburettor that can be added to a car engine to improve performance. It is fed gas by a fuel pump, which is rated at 3-4 psi. The Weber 32/36 usually does not have a return line or a fitting for one. This is because the stock Toyota return line system is a fuel vapour return line, not a liquid fuel return line. The return line coming off the stock Aisin carb goes to the charcoal canister, which is designed to catch and trap fuel vapours from getting into the atmosphere.
The charcoal canister is not designed to deal with liquid fuel from the return line. If the carburettor developed a stuck-closed needle valve and the carb flooded, liquid fuel would flow through the return line into the canister and ruin it. However, people have been running the Weber 32/36 on 20R engines for years with an aftermarket electric pump and no return line without any problems.
If you are concerned about pump life, you should consider moving the fuel pump closer to the tank. Underhood temperatures can exceed 200°F, which is not ideal for the pump. It will also work better by pushing gas up the line from the tank, rather than drawing it up the feed line. Most electric pumps are designed to work more efficiently this way.
The Weber 32/36 has a needle valve connected to a float, which closes when the fuel bowl is filled to the correct level. As the engine runs and uses the gas, the level drops, the float drops, and the needle valve opens to allow gas to flow in. Even at cruising speeds, the needle valve is not always open. Additionally, electric fuel pumps usually have a built-in relief valve, so the fuel supply line to the carburettor will not exceed the rated pressure of the pump.
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Fuel pressure is about 7 when it should be 3-3.5
The Weber 32/36 carburettor is a popular choice for many car enthusiasts and is often fitted to a variety of engines. However, one common issue that has been raised is the fuel pressure, which ideally should be kept at around 3-3.5 psi.
Some users have reported that their fuel pressure is reading about 7 psi, which is significantly higher than the recommended level. This can cause problems with the engine's performance, including an idle drop and potential stalling. In this case, a fuel pressure regulator is recommended to bring the pressure down to the desired level.
A fuel pressure regulator is a device that helps to control the amount of fuel that enters the engine, ensuring that the pressure stays within a safe range. By installing a regulator, you can prevent the engine from being overwhelmed with fuel, which can cause performance issues and even damage the engine over time.
For the Weber 32/36 carburettor, a pressure regulator set at 3 psi is generally recommended. This will help to ensure that the engine receives the correct amount of fuel and runs smoothly. It is important to note that the fuel pressure regulator should be installed correctly and set to the proper pressure to avoid any issues.
Additionally, it is worth noting that the Weber 32/36 carburettor typically does not have a fuel return line. This means that any excess fuel that is not used by the engine will not be circulated back into the fuel system. While this may not be an issue for some setups, especially with an aftermarket electric pump, it is something to be aware of when considering the overall fuel system design.
Furthermore, the size of the fuel inlet on the Weber 32/36 is also an important consideration. The nipple size is reported to be 5/16", and it is recommended to use a rubber fuel line that is compatible with this size to ensure a secure and proper connection.
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The idle will drop and the car will almost stall
If you are experiencing issues with your Weber 32/36 carburettor, such as a drop in idle and near-stalling, there are several potential causes and solutions to consider. Firstly, it is important to ensure that all other parts of the engine are in proper working order, including the ignition electrics and vacuum hoses. A proper tune-up and thorough check of all components are recommended before adjusting the carburettor.
One common issue with Weber 32/36 carburettors is that they are sensitive to fuel pressure and require a lower pressure than what is typically provided by the stock pump. A fuel pressure regulator can help address this issue by reducing the fuel pressure to the recommended 2-3 psi. Additionally, these carburettors are also sensitive to vacuum leaks, so it is important to check for any leaks around the intake, carb, and timing cover.
Another potential cause of the idle drop and near-stalling issue could be related to the float level setting. It is important to ensure that the float height is set correctly, as this affects the fuel mixture at idle and low RPMs. Adjusting the float height and ensuring it does not touch the bottom of the bowl may resolve the issue.
In some cases, the problem may lie with the jets. It is recommended to check the jet sizes and ensure they are the stock jet sizes, as rebuilt Weber carburettors may have non-stock jets installed. If the jets are found to be incorrect or faulty, they should be replaced with the appropriate ones. Additionally, issues with the throttle plate setting could also be a factor, and adjusting the throttle opening may be necessary.
Finally, it is worth noting that the Weber 32/36 carburettor was originally designed for a 4-cylinder engine, and while it can be used with a 6-cylinder engine, adjustments may be required to achieve optimal performance and fuel economy. Consulting a Weber carburettor expert or a competent specialist may be beneficial to fine-tune the jetting and other settings.
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The jetting must be set correctly for the carb to run right
To ensure that the Weber 32/36 carburettor runs correctly, it is important to set the jetting correctly. This involves a step-by-step process that includes checking for vacuum leaks, confirming carb baseline settings, and adjusting the mixture and speed screws.
Firstly, it is crucial to check for any vacuum leaks in the system. Common areas for vacuum leaks include the adapter, valve cover gasket, oil pan gasket, and timing cover gaskets. An easy way to test for leaks is to spray carb cleaner around the base of the carburettor and observe if there is any change in idle. If a leak is detected, it must be addressed before proceeding with the jetting adjustments.
The next step is to confirm the carb baseline settings. It is recommended to check these settings before installing the carb and with the choke disengaged or warmed up so that it is fully opened and disengaged. This can be achieved by manually opening the choke butterfly and using a wooden block to hold it open while cycling the linkage.
Once the baseline settings are confirmed, adjustments can be made to the mixture screw. If the mixture screw needs to be opened more than two turns, it indicates that the idle jets are too small. On the other hand, if the mixture screw needs to be shut below half a turn, the idle jets are too big. The number of turns it takes for the screw to bottom out can be noted, and if the engine dies during this process, it confirms that the baseline settings are correct.
Additionally, the speed screw should be checked and adjusted. The total number of turns from initial contact should be noted, and the final setting should be less than two full turns. If the settings deviate from the recommended ranges, it may be necessary to recalibrate the idle circuit or adjust the idle jet size.
It is worth mentioning that jetting and tuning a carburettor is a process that requires experience and a systematic approach. While there is no "magic" to it, following the steps correctly will ensure that the Weber 32/36 carburettor runs optimally.
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Frequently asked questions
The nipple size is 5/16".
It is suggested that you put on a fuel regulator to maintain the fuel pressure at 3-3.5.
The Weber 32/36 usually does not have a return line or a fitting for one.
