Adjusting the idle speed of a car engine with carburetors 2105, 2107 Ozone

Setting idle speed on a VAZ 2107

The idle speed adjustment is carried out after the car has pre-warmed up.
Using the quality screw, you need to adjust the maximum speed, and you do not need to turn the quantity screw. Then, using the quantity screw, you need to set the speed level to 100 rpm more than required. After this, we start the engine and adjust the speed using the quality screw to the required value.

Now you will know how to adjust the VAZ 2107 carburetor with your own hands, which will help you save time and money. We also recommend watching a useful video about setting up a VAZ 2107 carburetor.

Checking the condition of the strainer

It is necessary to fill the float chamber with fuel by pumping. This will close the shut-off valve, after which you need to move the top of the strainer, remove the valve and clean it with solvent. For optimal results, it is also recommended to use compressed air to blow out the valve.

This is interesting: Changing the oil in the Lada Vesta engine

If you decide to adjust the VAZ 2107 carburetor because the engine has started to run unstable, first of all, we recommend checking the strainer. Problems often arise due to problems in the fuel supply, which can be caused by a clogged filter.

Do not use a rag to clean the bottom of the float chamber. This will cause fibers to form on the bottom, causing the carburetor jets to become clogged. To perform cleaning, use a rubber bulb and compressed air.

A bulb is also used to check the tightness of the locking needle, since the pressure that appears as a result of squeezing this object with your hands approximately corresponds to the pressure of the gas pump. When installing the carburetor cover, you need to check whether the floats are set up. Significant pressure will be felt during installation. At this moment, the VAZ 2107 carburetor must be listened to, since air leaks are unacceptable. If you notice even a minimal leak, you will have to replace the valve body, as well as the needle.

Carburetor adjustments Ozone Car enthusiasts

Design and adjustment of the OZONE carburetor VAZ 2107
Adjustments of Ozone carburetorsAdjusting the fuel level in the float chamber is mandatory after replacing the needle valve or float. Having removed the carburetor cover, you should make sure that the float rotates freely on the axis, has no holes or dents, and does not touch the walls of the float chamber. . Check the tightness of the needle valve seat and the free, without jamming, movement of the damper ball in the “needle” drilling.

Holding the cover vertically with the fuel supply fitting upward, you should make sure that the gap between the cover gasket and the float is 6.5 ± 0.25 mm (in this case, the float tongue should touch the ball, but not recess it). We change the gap by bending the tongue, while its area in contact with the ball should be perpendicular to the valve axis

If all these conditions are met, carefully replace the cover

Adjustment of the pneumatic drive of the throttle valve of the second chamber (only for carburetor 2107-1107010-20) is performed when replacing the drive or rod with diaphragm. After removing the lock washer from the pin of the throttle valve drive lever of the second chamber, disconnect the rod. Having turned the throttle valve of the second chamber to a vertical position, press the pneumatic drive rod all the way. Loosen the lock nut on the rod and, holding the hex bushing with a wrench, turn the rod out or screw in until the hole in the rod coincides with the lever pin. Place the rod on the pin and secure it with a lock washer. Tighten the locknut on the rod axis.

Adjustment of the starting device is performed when replacing parts of the starting device. The air damper must be completely closed when the actuator handle is extended and fully open when the handle is recessed. If this is not the case, lubricate the cable with engine oil and move the end of the cable in the air damper drive by unscrewing the fastening screw. Pull out the choke control lever (choke button) until it stops. In this case, the air damper 2 should be completely closed, and the end of the rod 3 of the starting device should be at the end of the groove of the rod 4, but not move the rod (if this is not the case, straighten the deformed parts, adjust the length of the rod 3 by bending it).

With air damper 2 completely closed, throttle valve 6 of the first chamber should be slightly open by 0.8–0.9 mm (starting gap C at the location of the idle system vias). This gap is changed by bending the rod 7 for adjusting the throttle position.

The air damper 2 should be opened slightly by 5.5±0.25 mm (starting gap B) by the trigger rod 4 when moving it manually inside the starting device body until it stops. To adjust the gap, unscrew the plug screw on the starter housing, under which there is adjusting screw 5. Rotate it with a thin slotted screwdriver to achieve the required gap.

Replace and tighten the cover screw.

Adjustment of the idle system is carried out during maintenance and engine malfunctions

The adjustment is performed on a warm engine with the choke button fully recessed. At the factory, the engine is adjusted to a minimum crankshaft speed of 850 ± 50 rpm and a carbon monoxide (CO) content of 0.5–1.2%, after which restrictive plastic bushings are pressed onto the screw heads. If by turning the bushings it is not possible to restore the factory adjustment parameters, turn out the screws, breaking the bushings, then by rotating the quantity screw set the crankshaft speed to 850±50 min –1, and by turning the quality screw set the content of carbon monoxide (CO) in the exhaust gases to 0.5–1 .2%. When you press the gas pedal, the engine should increase the crankshaft speed without interruption, and when you release the pedal, it should not stall.

When turning the quantity screw clockwise, the crankshaft speed decreases. When turning the quality screw clockwise, the CO content in the exhaust gases decreases.

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Procedure for adjusting DAAZ 2107-1107010-20

Adjustment is carried out only on a serviceable and serviced carburetor. It is highly desirable to have a device that can measure harmful CO emissions. Let's look at the procedure:

• We check the level in the float chamber. This is done using a template, which you can make yourself or purchase at a specialized store.
• We check the gaps of the contact group of the ignition distributor (look in the technical book of your car) and visually inspect the spark plugs. The latter must strictly correspond to the engine model according to the heat rating.
• We start the engine and let it warm up to operating temperature.
• We use a screwdriver to adjust the screw for the amount of combustible mixture. With its help, you should set the speed within 820-900 rpm. We control their number using a tachometer (built-in or separate).

We tighten the fuel mixture quality screw. At the same time, it is important to monitor the amount of CO in the exhaust gases (a working engine at a temperature of 20 degrees Celsius produces 0.5-1.2% CO). Use the mixture quantity screw again and set the idle speed.

Pump booster drive

Setting up the Solex 21083 carburetor

The greatest controversy in carburetor tuning is replacing the pump amplifier drive cam. Some car owners recommend replacing it with No. 4, but many are against it, citing the following arguments:

• a significant increase in fuel consumption in urban and mixed driving modes;
• dips in dynamics when the accelerator pedal is pressed sharply;
• poor acceleration at low speeds, which is especially noticeable when trying to make a sharp start at a traffic light.

Upgrading the carburetor by replacing the cam should be done with the possibility of going back, so you should not throw away the standard spare parts left after tuning. The result for each car is individual, so after replacement you should check the gas mileage and improvement in dynamic performance. If the ratio of these parameters suits the car owner, then you can leave the tuning spare part, otherwise you should return to the standard part.

How to assemble a carburetor ozone 2107

Adjusting the VAZ 2105 carburetor. VAZ 2105 carburetor step-by-step instructions for setting it up. VAZ 2105 carburetor ignition adjustment

Old VAZ models, as a rule, were equipped with carburetors of the following brands: Solex, Weber and Ozone; their popularity over many years of operation has not decreased, but rather, on the contrary, increased. However, like everything in this world, over time, carburetors fail and need repair, cleaning, and adjustment, which in turn puts a considerable burden on car owners, requiring them to have certain knowledge and free time.

In order to save time and money, I bring to your attention a detailed guide on how to clean the carburetor, service it, and also how to adjust the VAZ 2107 carburetor.

The principle of operation of a carburetor from different manufacturers is essentially the same; its task is to create a fuel-air mixture, mixing it in certain proportions with fuel and air, after which it is supplied to the combustion chamber, where ignition occurs. Well, I think the rest is clear!?

There are three types of carburetors: float - this is perhaps the most common among all, needle and bubbler - quite rare.

In today's article we will talk about the Ozone carburetor. which is installed on the VAZ 2107, after that you will learn how to clean the carburetor and how to adjust the carburetor of the VAZ 2107. Before you begin, you need to understand something, the fact is that some modifications of carburetors may differ significantly from those installed on a similar car model .

Hello, dear motorists! Until recently, all cars of the domestic automobile industry had a carburetor fuel supply system. This did not surprise or worry us. Domestic carburetors, such as Weber, Ozone, Solex, still enjoy deserved popularity.

The operating principle of carburetors of different brands is essentially the same, with the exception of some design features. The carburetor (from the French word “carburetion” - mixing) performs the function of creating a combustible mixture, mixing fuel with air and evenly distributing this mixture throughout the cylinders of an internal combustion engine. That is, nothing new.

There are quite a large number of types of carburetors. According to their design, they are divided into: bubbling (no longer used), membrane-needle and float (the most common type).

In this material we will understand what the VAZ 2107 carburetor is. According to the design, the 2107 “Ozone” carburetor is a float-type carburetor.

Before we look at the design and configuration of the 2107 carburetor, so as not to return, you need to remember the following.

Equipment location and dismantling

The standard fuel mixer is installed on the exhaust manifold platform using four studs in the engine compartment. It is recommended to carry out prophylaxis in the removed state. The design contains many small parts and mechanisms that require cleaning and diagnostics. Of course, if the breakdown is obvious and insignificant, then there is no need to dismantle the equipment at all. The final decision is made by the repairman. After all, this directly proportionally affects the final cost of the work.

To remove the carburetor from its standard seat, you must:

• Unscrew the air filter cover on the right side of the engine, remove the cleaner itself and its housing part. Having previously unscrewed the four nuts to “8”. Some motorists independently modify the mechanism to accommodate long “10” bolts for ease of fixation;
• disconnect the crankcase exhaust pipes, vacuum hose, fuel supply pipe, return channel. Since there are gasoline residues in the pipes, you need to get a rag to remove the consequences of the leak.

Note to the driver: it is strictly forbidden to carry out repair work on a “hot” engine, as there is a high probability of ignition. Ignoring these recommendations leads to undesirable consequences. Woe - craftsmen often get burned.

When the body part of the “mixer” is completely freed from third-party mechanisms, it is necessary to release the fastening bolts of the top cover using a Phillips-head screwdriver. Just five;

This completes the dismantling of the upper half of the cover. To carry out a full diagnosis/repair, it is necessary to unscrew the second - lower part. The landing platform is mounted on four studs with nuts.

When removing the carburetor from its original place, you need to be extremely careful. The manifold outlet is open and a foreign object may get inside that should not be there. This can lead to the inoperability of the entire unit.

Operating principle of Ozone carburetors

The principle of operation of the carburetor produced by the Dimitrovgrad Automobile Unit Plant (DAAZ) can be described by the following provisions:

The fuel supply device ensures that it (fuel) flows through a filter mesh and a needle valve that determines the filling level of the float chamber.

The first and second chambers are filled with fuel coming from the float chamber through the main fuel jets. In emulsion wells and tubes, gasoline is mixed with air coming from the corresponding jets. The finished combustible mixture (emulsion) flows through sprayers into diffusers.

After starting the power unit, the shut-off solenoid valve closes the “idle” channel.

In the “idle” mode, gasoline is selected from the first chamber and its further movement through a nozzle connected to an electromagnetic lock. As fuel passes through the idle jet and the compartments of the transition system of the 1st chamber, gasoline is mixed with air. Next, the combustible mixture enters the pipeline.

At the moment of partial opening of the throttle valves, the air-fuel mixture enters the chambers (using the holes in the transition system).

Passing through the econostat, the fuel mixture enters the nozzle from the float chamber. In maximum power mode, a device that enriches the emulsion is switched on.

The ball valve of the accelerator pump opens when it is filled with the fuel mixture. The valve closes (under the influence of its own weight) when the fuel supply stops.

Controls in Solex carburetors

On front-wheel drive VAZs, the carburetor is much more advanced, and this applies not only to idle speed. The idle speed setting itself is clearer here based on the principle of operation of the controls.

The quantity screw (1) here is the throttle valve stop in the first chamber, directly controls the amount of air passing through the carburetor at idle. The fuel, passing through the fuel nozzle, which is locked by an electric valve (the forced idle economizer is electronically controlled), forms an emulsion that is supplied to the channel controlled by the quality screw (2).

Boring large diffusers

One of the drastic ways to remake a carburetor is to increase the air flow by boring the diffuser. The car gains improved dynamics under heavy and medium loads. This method is not without its drawback - at low speeds, failures in engine operation appear.

Boring of diffusers should be part of a comprehensive carburetor tuning. After this, the selection of new jets is mandatory. If the required diameter is not available, they will need to be drilled out. This operation is especially relevant for forced engines of 1.7 and 1.8 liters, since nozzles of increased diameter are not available for sale for them.

Not all car owners agree to put up with dips at the bottom. To improve dynamics at low speeds and at light loads, use:

• Fuel nozzle, which has a larger diameter compared to the standard one. Installed in the EPHH valve;
• Enlarged spray nozzle. It is usually installed in the first chamber, and in the second, at the discretion of the car enthusiast, you can put the same spout;
• Cam UN, with an increased size.

For boring you can use:

• special scan;
• feather drills for wood.

To improve the aerodynamic properties after boring, the roughness on the surface of the diffuser should be removed. For this, sandpaper with a gradual reduction in abrasiveness is used. It is recommended to do the final treatment with zero-grit sandpaper. For more thorough processing, you can use Goya paste or a woolen rag.

How to remake a carburetor completely depends on the skills and financial capabilities of the car owner. Tuning should be done with a reasonable approach, so that instead of increasing power, you do not end up with increased fuel consumption and unstable engine operation.

But it seems to me that tuning in this component is completely inappropriate. Blowing, flushing regularly and good fuel - that’s all the necessary tuning when it comes to the carburetor...

I also think that this is just overkill. Why spend money on carburetor tuning? I definitely won't do this!

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Video Do-it-yourself Ozone carburetor adjustment

Work on adjusting the Ozone carburetor is carried out not only when it (the carburetor) is not operating correctly, but also in the event of repairs that involve replacing some elements of this unit. Let us consider in more detail the list of settings that are a mandatory continuation of repair and restoration work.

Replacing the rod with the diaphragm or the valve (throttle) drive of the second chamber requires adjustment of the pneumatic drive.

After replacing the elements of the starting device, it is configured.

The reasons for adjusting the “idle speed” system, along with disruptions in the functioning of the power unit, is to prepare the car for a technical inspection.

Replacing a float or needle valve requires adjusting the fuel level in the chamber (float chamber).

Adjustment and Maintenance

For stable operation of all systems, there are maintenance regulations that must be followed. Before adjusting the ozone carburetor on cars of brand 2107, you need to identify the faulty unit; there is no need to rinse or disassemble working units. Flushing the system can be done easily at home; it is important to follow the sequence of steps.

1. Repair and adjustment of the ozone 2107 carburetor begins with its dismantling and disconnecting all supply systems. It is necessary to disconnect the throttle valve actuator, the coolant supply, and the fuel hose.
2. Clean and rinse the VAZ carburetor, modify the outside with ozone, and inspect for mechanical damage.
3. Clean the strainer and starter with compressed air under low pressure.
4. The float system is cleaned of obvious carbon and deposits. It is important to understand that old scale will be difficult to clean, and it can also get into the nozzle holes and disrupt the operation of the system.
5. Wash and adjust the trigger mechanism, air jets, and exhaust system.
6. We adjust the carburetor components, assemble and install the device before regulation, which is subsequently adjusted to a hot engine.

Adjustment and tuning are carried out according to the assigned sequence of screws, for the desired fuel consumption and dynamic performance of the car. The technical condition fully corresponds to the driving characteristics and comfort when moving the vehicle.

Supply system

Adjusting Ozone carburetors

Adjusting the fuel level in the float chamber is mandatory after replacing the needle valve or float (see also “Diagnostics of engine malfunctions”).

After removing the carburetor cover, you should make sure that the float rotates freely on its axis, has no holes or dents, and does not touch the walls of the float chamber. It is necessary to check the tightness of the needle valve seat and the free movement of the damper ball in the needle drilling without jamming.

Holding the cover vertically (with the fuel supply fitting up), you should make sure that the gap between the cover gasket and the float is 6.5 ± 0.25 mm (in this case, the float tongue should touch the ball, but not recess it). We change the gap by bending the tongue, while its area in contact with the ball should be perpendicular to the valve axis.

If all these conditions are met, carefully replace the cover. Adjustment of the pneumatic drive of the throttle valve of the second chamber (only for carburetor 2107-1107010) is performed when replacing the drive or rod with diaphragm

Adjustment of the pneumatic drive of the throttle valve of the second chamber (only for carburetor 2107-1107010) is performed when replacing the drive or rod with diaphragm.

After removing the lock washer from the pin of the throttle valve drive lever of the second chamber, disconnect the rod. Having turned the throttle valve of the second chamber to a vertical position, press the pneumatic actuator rod all the way. Having loosened the lock nut on the rod and holding the hex bushing with a wrench, we turn out or screw in the rod until the hole in the rod coincides with the lever pin. Having placed the rod on the pin, we secure it with a lock washer. Tighten the locknut on the rod axis.

Adjustment of the starting device is performed when replacing parts of the starting device.

Carburetor starting device: 1 – air damper drive lever; 2 – air damper; 3 – traction; 4 – rod-earring; 5 – adjusting screw; 6 – telescopic rod; 7 – rod for adjusting the throttle position; 8 – throttle valve.

The air damper must be completely closed when the actuator handle is extended and fully open when the handle is recessed. If this is not the case, lubricate the cable with engine oil, rearrange the end of the cable in the air damper drive, unscrewing the fastening screw.

Pull out the choke control handle as far as it will go. In this case, the air damper 2 (see figure) should be completely closed, and the end of the rod 3 of the starting device should be at the end of the groove of the rod 4, but not move the rod (if this is not the case, straighten the deformed parts, adjust the length of the rod 3, bending it ).

When the air damper 2 is completely closed, the throttle valve 8 of the first chamber must be slightly open (starting gap C at the location of the idle system transition holes). We change this gap by bending rod 7 for adjusting the throttle position.

The air damper 2 must be opened slightly (starting gap B) by the rod 4 of the starting device when moving it manually inside the starting device body until it stops. To adjust the gap, unscrew the plug screw on the starter housing, under which there is an adjusting screw 5. By rotating it with a thin slotted screwdriver, we achieve the required gap. Reinstall and tighten the cap screw.

Adjustment of the idle system is carried out during maintenance or disturbances in engine operation (see “Diagnostics of engine malfunctions”).

The adjustment is carried out on a warm engine with the choke handle fully recessed. To adjust the idle system, you need a tachometer and a gas analyzer that determines the content of carbon monoxide and hydrocarbons in the exhaust gases.

In the absence of a gas analyzer, the idle air system can be adjusted with acceptable accuracy as follows. With the engine running, turn the quality screw (in both directions) to set the maximum crankshaft speed at idle. Then, by rotating the EPHH pneumatic valve body (carburetor 2140-1107010-70) or the quantity screw (carburetor 2107-1107010), we set the crankshaft speed to 850 min-1 and increase it by about 100 min-1. After this, without changing the position of the EPHH pneumatic valve body (or the quantity screw), we tighten the quality screw, reducing the crankshaft speed to 850 min-1. This method of adjusting the idle system allows (provided the engine and its systems are in good working order) to obtain the content of CO and CH in the exhaust gases within normal limits.

Setting up the VAZ 2107 carburetor

Carburetor adjustment is carried out in the following sequence:

First, wash and clean the outer part of the carburetor elements. Next, you need to check all the elements for visible defects. It is also very important to remove various filter contaminants. Then wash the float chamber. Be sure to clean the air jets. At the end, the float chamber of the VAZ 2107 carburetor, as well as the starting mechanism and idle speed are adjusted.

We would like to emphasize that to carry out this kind of work it is not necessary to dismantle the carburetor. In addition, you need to understand that all elements have a self-cleaning function, and dust and dirt do not penetrate inside.

It is recommended to check the strainer every 60 thousand kilometers traveled. It is located near the entrance to the float chamber.

"Solex" on "Classic"

It is believed that the Solex carburetor on the VAZ-2106 provides a significant reduction in fuel consumption and greater power. Practice shows that there is truth in this, although experts do not recommend such tuning.

As for the settings, the procedure is similar to the “Ozone” setting. Here you also need to warm up the engine. Then check the float chambers and fuel level. According to reference books, as well as in practice, the best level is 25 millimeters between the edge of the chamber and gasoline. At this level, the spark plugs will not be flooded, and the car will not stall at idle. Adjust the level by bending the tongue of the floats.

Next, all actions come down to setting the idle speed. How to adjust the carburetor on a VAZ-2106? It's easy to do. Use the quantity screw to set stable speeds, then use the quality screw to achieve maximum speed. At the same time, if you rotate it further, the engine should stall. This means that the mixture has been over-rich. If the revolutions no longer increase after rotation, set the speed screw to 850–900 revolutions.

Here's how to set up a carburetor on a VAZ-2106. Next, you should check the car on the road. If gaps appear, they should be eliminated.

Classic VAZ cars with carburetor engines are gradually disappearing from our lives, since they are no longer produced by industry, but there are still quite a lot of similar cars in operation. In order for the car to serve the owner without problems and cause a minimum of hassle, it is necessary to maintain the technical condition of the vehicle, including periodically requiring adjustment of the VAZ-2106 carburetor.

The carburetor unit in this car is a rather complex technical device, consisting of such main parts as a float chamber, accelerator pump, main metering and idle system, starting device, etc. Basic operations for setting up the carburetor should be entrusted to specialists, but the car owner, with certain skills, can adjust the idle speed or the level of gasoline in the float chamber independently.

VAZ 2107 carburetor design diagram

First, I would like to emphasize that individual versions of carburetors may differ significantly from each other, since they are used only on certain cars. In our case, the situation looks like this:

• The DAAZ 2107-1107010 version is used exclusively on VAZ 2105-2107 models.
• The DAAZ 2107-1107010-10 version is installed on VAZ 2103 and VAZ 2106 engines with an ignition distributor, which do not have a vacuum corrector.
• The DAAZ 2107-1107010-20 version is used exclusively on the engines of the latest VAZ 2103 and VAZ 2106.

The design of the VAZ 2107 carburetor looks like this:

• float chamber;
• autonomous idle system;
• dosing system;
• transition system of two chambers;
• idle shut-off valve;
• throttle valve;
• crankcase gas exhaust compartment;
• econostat.

You simply do not need more detailed information, since it is not useful for adjusting the VAZ 2107 carburetor. The carburetor of this car includes the following devices that provide and also distribute the combustible mixture:

1. Support for starting and warming up the engine.
2. Econostat system.
3. Maintaining a stable gasoline level.
4. Acceleration pump.
5. Engine idle support.
6. The main metering chamber, in which the fuel and air nozzles, emulsion tube, VTS atomizer, well and diffuser are located.

Before cleaning the VAZ 2107 carburetor and further tuning it, you must clearly understand that you should not disassemble those elements that normally perform their functions. In particular, you need to be very careful with the dosing system.

Important elements

Of course, you don’t need to know all the technical data of the carburetor, unless, of course, you are an expert in this field. However, a large number of mechanisms (more than 60 components) in its design will lead even the most experienced driver to a dead end, so you need to get acquainted with its main details. So, the effective operation of the carburetor is ensured by its main functional components:

• Dosage system;
• Float and mixing chambers;
• Float and needle valve;
• Throttle and air dampers;
• Econostat – enrichment device located in the float chamber;
• Accelerator diaphragm pump with sprayer;
• Device for removing gases from crankcases;
• Camera transition systems;
• Autonomous idle mechanism with built-in solenoid valve;
• Jets – air and fuel.

As we can see, the wolf is not as scary as they portray him to be! Knowing all these carburetor mechanisms in person, and even better their location, we can adjust it without any problems, but first things first.

Refinement of the Ozone carburetor

The main problems of carburetor operation

So, in what cases is the Ozone carburetor modified? The main disadvantage of a carburetor is the unevenly distributed fuel entering the engine cylinders. Carburetor injection cannot create the necessary fuel-air mixture, which will be universal for any operating mode of the power plant. The problem with any carburetor is the stepwise preparation of the working mixture (gasoline + air). When you press the gas pedal, the engine gradually moves from idle to high speed, and then to medium speed, at which time various metering elements are connected or disconnected in the carburetor system. Due to such stepwise transitions, peculiar “dips” arise and the power of the power unit is lost due to the strong depletion or enrichment of the mixture used.

It is important that the working mixture during injection is distributed evenly and in equal quantities to all cylinders, but in reality this does not happen. This is due to shortcomings in the design of the intake manifold during its production.

A clear example of such a case is the domestically produced intake manifold, which was installed on VAZ cars.

The main drawback of the intake is the different lengths of the manifold intake ports. This design leads to uneven filling of the cylinders with the working mixture. In this case, engine power is greatly lost.

During the transition from low to medium and high speeds at medium loads, the 1st and 4th cylinders receive a mixture that is richer to a greater extent than the 2nd and 3rd. This is due to the operation of the 1st chamber of the carburetor in this mode. When you sharply press the gas pedal, the accelerator pump will again supply a large amount of fuel into the 1st chamber, the main part of which will then enter the first and fourth cylinders.

The designers of Solex carburetors were partially able to solve this problem by installing an accelerator pump nozzle in both chambers.

When the engine reaches medium and high speeds and the load increases, the 2nd chamber is activated and the rich working mixture enters the 2nd and 3rd cylinders. With such a mixture distribution, the engine operates unevenly, therefore, it will not be possible to accelerate quickly and smoothly. Torque and power are reduced, resulting in poor transmission performance and increased fuel consumption.

The carburetor problems don't end there; Another is the discrepancy between the intake manifold and head channels at the junction.

Some mechanics try to solve the problem by polishing the channels, hoping that such carburetor tuning will increase power and torque. Unfortunately, all efforts are in vain, since vortex flows form in the place where the manifold and cylinder head are connected. Thus, there is no point in polishing the channels, since this will not ensure uniform supply of the mixture to the cylinders.

Nuances and main malfunctions of Solex carburetors

Despite all the positive aspects and advantages, Solex carburetors have their disadvantages and characteristic “diseases”; one of the main disadvantages is problems with idling due to clogging or airing of the channel. Air enters the XX system mainly due to the tight fit of the cover to the body, since over time the metal is deformed, and such a defect can be corrected by replacing the gasket and grinding the adjacent surfaces.

Another common problem with idle speed is a clogged channel, which can only be cleared if you remove the quality adjustment screw. But the whole difficulty lies in dismantling this screw, since it is located deep in the “body” of the carburetor and is held in place by a rubber seal.

Even a completely unscrewed screw does not simply come out of the channel; it can be dismantled using a piece of hollow tube, for example, taken from an old radio. To use the tube as a puller, we make two cuts at the end, then insert the device into the channel, and remove the part we need by twisting it out.

Another typical drawback of Solexes is failure while driving when accelerating the car, which occurs due to the accelerator pump. To correct this defect, car owners most often upgrade the accelerator pump nozzle (“spout” or “elephant” in common parlance), transferring the injection of both tubes to the primary chamber. Solex practically does not cause any other troubles; it serves for a long time and reliably.

Grinding the diffuser

It is recommended to start tuning a Solex carburetor by reducing the resistance to air flow in the intake tract. The factory-made diffuser has a lot of sagging and protrusions caused by poor casting quality and subsequent surface treatment. Because of this, parasitic air flows and turbulence arise, which interfere with the flow of the mixture into the combustion chamber.

To correct the situation, you should disassemble the carburetor and visually inspect the diffuser. It usually looks like the one shown in the figure below.

Initially, it is necessary to sand all seams and protrusions that have arisen due to imperfect production technology. As a result of the modification, you should get a result as in the figure below.

At this stage, it is possible to complete the improvement of the passage of the fuel-air mixture, but as you know, there is no limit to perfection. Experienced car enthusiasts recommend not stopping only at polishing manufacturing defects, but giving the diffuser maximum aerodynamic characteristics. You can achieve good streamlining of the surface by giving it a shape similar to an oval or wing, as shown below.

By modifying the surface of the diffuser, you can increase the efficiency of the DaAZ carburetor by up to 20%. Eliminating an aerodynamic error changes the composition of the mixture, so after assembling the carburetor it is necessary to adjust it again.

The importance of carburetor modifications

Carburetors produced from the factory are designed to operate the engine on a forced lean mixture, which ensures maximum efficiency and environmental concern. Because of this, the standard carburetor does not allow the engine's power to be fully realized, and the car does not realize all its dynamic characteristics. Carburetor tuning is especially important when boosting the engine, since the need for a sufficient amount of prepared air-fuel mixture increases even more.

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Standard carburetor adjustments can affect idle speed, but set it up for optimal performance in the midrange. and even more so at high speeds it is not possible. At speeds above 4500, engine starvation occurs, since an unfinished carburetor is not able to cope with an air flow at a speed of about 120 m/s. As a result, a situation arises that an untuned carburetor strangles both forced and conventional engines.

Modifying the carburetor to reduce fuel consumption is an extremely rare operation. For the most part, it leads to failures when operating under load and unstable idle speed. This leads to a decrease in the reliability of the power system, so tuning the carburetor to reduce fuel consumption is not recommended.

Signs of a poorly configured device

Car owners turn to carburetor service specialists for literally every “sneeze.” But there are several signs or symptoms by which you can determine the need to adjust the VAZ-2106 carburetor.

If the engine often overheats, consumes a lot of fuel, does not produce full power, and you hear popping noises and black smoke coming out of the exhaust pipe, then this indicates that the carburetor is preparing an excessively rich mixture. There is little air and a lot of gasoline. This mixture burns very poorly.

It happens that the mixture is excessively lean. This can be determined by the same overheating, loss of engine power, popping sounds in the carburetor.

But don’t immediately grab a tool and a big book on carburetors. It is quite possible that the carburetor has nothing to do with it. The same symptoms, namely shooting at the muffler or carburetor, are associated with ignition. Shoots at the muffler - late ignition on the VAZ-2106. The carburetor is innocent here. And vice versa, if a flame bursts out of the carburetor and popping sounds are heard, then the ignition is early. You need to set the correct OZ.

Owners often complain about poor idle speed. If the engine refuses to idle, then the problem is definitely in the carburetor. If the engine is running, but the idle is rough, then it is possible that the brake booster diaphragm is broken or there is air leaking through the intake manifold gasket.

Here you should work comprehensively - very often smooth engine operation can only be achieved through a series of measures.

Setting up the carburetor VAZ 2107 float chamber

To adjust the float chamber, perform the following steps:

Check the position of the float and make sure that its mounting bracket is not deformed (if the shape has changed, the bracket will have to be aligned). This is very important, because otherwise the carburetor float will not be able to sink normally into the chamber. Adjustment with closed needle valve

Open the cover of the float chamber and move it to the side. Then you need to carefully pull the tongue of the bracket. You need to ensure that there is a distance of 6-7 mm between the cover gasket and the float

After immersion it should be between 1 and 2 mm. If the distance is noticeably greater, you need to change the needle. When the needle valve is open, there should be approximately 15 millimeters between the needle and the float.

To perform these steps, it is also not necessary to remove the carburetor from the engine.

What to check before adjusting?

Before setting up the VAZ-2106 carburetor, you should carefully test all systems and components that control the operation of this device or somehow influence it. This will help identify various malfunctions and you won’t have to touch a normally working carburetor. So often in uneven idling, the distributor is to blame.

The first thing to check is the external components. Inspect the throttle valves and their mechanism, then inspect the air damper. Next, you need to make sure that the return spring securely fixes the dampers. Drive rods and connections are also checked.

If you feel a failure during acceleration, then you should check the correct operation of the accelerator pump. To do this, press the lever - two strong jets of fuel should shoot out of the nozzles. This means that everything is fine with the pump, and there is something else going on here.

Then they check the integrity of the pneumatic drive diaphragm - this is the sore spot of the VAZ-2106 carburetor. When external inspection does not produce results, clean all jets and nozzles. To do this, remove the top cover and then use a pump or compressor to blow through the carburetor channels with compressed air.