Install a VAZ 2108 carburetor on a VAZ 2106

For 30 years, while classic rear-wheel drive VAZ models were produced, their design, in contrast to style and design, was virtually unchanged by the manufacturer. Therefore, owners are trying to modernize the car themselves - introducing various components from imported cars or more technologically advanced VAZ models.

For example, many owners do not like the way Ozone and Weber carburetors work, which are not capable of providing acceptable acceleration dynamics, uniform acceleration, and acceptable fuel consumption. Despite the fact that all this is already in Solex. That is why most car owners strive to install a licensed French Solex on their classics.

"Ozone" and "Weber" under certain road conditions excessively leaned the fuel mixture. This happened because the float moved in the float chamber when sharply entering a turn or climbing a steep mountain. Solexes do not have such a disadvantage - they are equipped with two-section float chambers, paired floats that move in other planes. The Solex device is more modern and advanced.

Which Solex to choose

Units produced by Dimitrovgradsky differ mainly in the geometry of the jets. There is a difference in the diameters of the diffusers, as well as in the size and design of the air jets. The cam profile also differs.

However, without any unpleasant consequences or modifications, absolutely any Solex from the entire series can be installed on a car for which the carburetor was never made. Many models and modifications of these carburetors were produced - they were equipped with VAZ-08, 09, AZLK-21412, ZAZ-1102. There are “Solex” for VAZ-2104, 05, 07. This all means that absolutely any unit from the mentioned line can be installed on rear-wheel drive VAZs without modifications or almost without them.

The result of tuning depends on the choice of a particular Solex. But in any case, the engine’s traction will improve and the car will accelerate smoothly. To save money, it is worth choosing the Solex modification on the Tavria - this is DAAZ-2181. If you need increased acceleration dynamics, then select DAAZ-21073. It features diffusers of larger diameter. This carburetor was created for engines with a displacement of 1.7, and after installing this Solex on a classic, you should prepare for high fuel consumption.

Solex models 2108, 21083, 21051-30 are considered by motorists to be the golden mean. The units are capable of providing better dynamic characteristics and lower fuel consumption when comparing their characteristics with Ozone.

Summarize

Finally, we add that there are single-chamber and two-chamber models of foreign-made carburetors. The disadvantages of this choice include high cost, difficulty in setting up and maintaining, as well as not always better dynamics and efficiency compared to the DAAZ, Solex or Weber carburetor models listed above.

Features of adjusting the Solex carburetor. How to set the fuel level in the float chamber, adjust the idle speed, select jets, remove dips.

Carburetor cleaning: when to clean the metering device, signs and symptoms. Available methods for cleaning the carburetor without disassembling and removing it from the car.

Why does the engine shoot into the carburetor and into the exhaust system. Causes of popping sounds in the carburetor, additional symptoms, troubleshooting.

Carburetor structure, types and design features. Float carburetor, advantages and disadvantages.

Installing a carburetor instead of an injector, features of the process of replacing the injection system. Replacing the carburetor with electronic fuel injection. Recommendations.

The main reasons that lead to a lean mixture. A lean mixture on carburetor and injection internal combustion engines, as well as on engines with gas equipment. Diagnostics, repair.

Design, repair and operation

Over the course of 30 years of production of “classic” rear-wheel drive VAZs, their design, unlike their appearance, has remained virtually unchanged. Therefore, car owners are constantly trying to modernize them, introducing new components and assemblies from foreign cars or more modern VAZs. Many, for example, are not satisfied with the operation of the Ozone or Weber carburetor, which do not provide good acceleration dynamics, uniform acceleration, low fuel consumption and low toxicity levels. At the same time, their “younger brother” Solex can do all this. This is why many people replace their original carburetor with a licensed “French” one.

The Dimitrovgrad Automotive Aggregate Plant (DAAZ), under license from the French company Solex, produces about a dozen modifications of Solex carburetors for engines with different displacements. This carburetor model was originally created for front-wheel drive VAZ models, since “Weber” and “Ozone” installed on an engine transversely located in the engine compartment, in certain driving modes (during sharp acceleration, cornering, on steep climbs) over-leaned the fuel-air mixture . This happens due to unwanted movements of the float in the float chamber. Solexes do not have this drawback, since their float chamber is two-sectional, i.e. with paired floats that move in a plane perpendicular to the longitudinal axis of the car (and not parallel, like Ozone and Weber). In addition to the “eights” and “nines”, in the mid-80s “Solexes” began to be installed on other new front-wheel drive models - “Muscovites” AZLK-21412 (with their usual longitudinally mounted UZAM-331.10 engine) and “Tavria” ZAZ-1102 .

Important little things

Any Solex (except 21073) has jets with very thin holes. It should be noted that because of this, the jets are very sensitive to debris in the fuel, and the carburetor itself often becomes clogged with dirt. For this reason, fuel filters should be changed regularly. To increase reliability, you can install an injection fuel filter. It will be a little more expensive, but you can increase the interval between inspections of the unit.

If the decision to install a Solex carburetor on a classic is made, then in addition to the carburetor, additional spare parts may be needed. The unit can be installed with or without recreating the EPH system - only the unconnected solenoid valve will remain. The easiest way is to get by with this system. But experts say that although the EPHH allows for 5% fuel savings, the system is unreliable and often fails. And this significantly reduces the reliability of the entire unit.

To prevent the solenoid valve from cutting off the fuel supply to the Solex idle channel (after all, the EPHH unit is not installed as standard), it is necessary to remove the valve needle from the housing. But the easiest way is to connect the valve from the ignition switch.

When installing Solex on rear-wheel drive VAZs, you need to plug the return flow with a plug or connect it through a check valve to the fuel supply system to the fuel filter.

How does the Ozone carburetor work?

The VAZ 2106 “Ozone” carburetor is a two-chamber emulsion-type device with a falling flow. The first chamber is intended for the dosing system and enrichment device, in the second the mixture of fuel and air is created in the required ratio. What is the operation scheme of the Ozone carburetor?

The fuel pump directs fuel into the float chamber through a needle valve, which maintains the required level. Through the nozzles, the fuel enters the first and second chambers, and then into the emulsion wells, where it is mixed with air, also entering through the nozzles. The created mixture is supplied to the carburetor diffusers.

Immediately after the engine starts, the idle channel is closed by an electromagnetic valve, then at idle speed gasoline flows from the first chamber. As the fuel moves through the nozzle, it mixes with air. When the throttle valves open more (when you press the gas pedal), the resulting mixture goes into the carburetor float chambers, through the transition holes. Through the econostat, the mixture enters the atomizer, which directs it into the combustion chamber of the engine.

General view of the Ozone carburetor

How to get the most benefit

It’s not enough to install Solex on a classic; to experience all the benefits, you also need to modernize the ignition system. Instead of the standard one, contactless ignition is installed. Any Solex is initially configured and designed to prepare a lean mixture. To ignite it effectively, a more powerful discharge is needed. A contact ignition system cannot produce such a discharge, but a contactless one can. Its coil can generate voltage up to 25 thousand volts. The spark plug gap will be no more than 0.8 mm.

New or used?

You can buy a new Solex for a classic, but it is also possible to purchase a used carburetor. In the second case, it is necessary to carry out an inspection - thoroughly clean the channels, polish the diffusers. In addition, it is better to purchase and replace jets.

But at the same time, you should not buy modern products - it is better to ask your friends and acquaintances for those that were made in the USSR. Modern jets found in repair kits often do not correspond to the calibration dimensions.

In order for the diffuser to work effectively, burrs and protrusions are removed from its elements using a file. Such defects create air turbulence, and this does not have the best effect on filling the cylinders.

What you might need

The first step is to purchase spare parts that will be needed during the installation of the Solex on a classic model VAZ:

You should buy thin paronite gaskets. But they need to be made specifically for Solex. The holes in the gasket for diffusers differ from Webers and Ozones.
Instead of two gaskets, you can buy one with two holes. It is placed between the carburetor and the getinax gasket. In addition, they take another one - with an oval hole. It is intended for installation between the manifold and the getinaks gasket.
They also buy a return hose. Its length must be at least 80 centimeters. Otherwise, it will not reach the fuel line under the pump.

Settings

Before you start operating the carburetor from a VAZ 21083 on a VAZ 2106, it must be configured.

In order for the mixture to be prepared better and for you to make adjustments easier, park the car on level ground, without slopes. Start the engine and test it at high and low speeds. This will let you know in which mode the engine receives a normal mixture, and in which it requires adjustment.

After running the engine for a while on the new carburetor and filling its chambers with gasoline, you will need to check what a constant level is in them. To do this, remove the cover from the carburetor, and using a caliper, measure the distance from the fuel level to the top edge of the float chamber. It is best if the level is from 23 to 25 mm. In this case, the carburetor will not flood the spark plugs and stall at idle.

To adjust the fuel level, simply bend the float in the desired direction (up or down). After each change in position, check the resulting distance. When the float is set, assemble the device and begin adjusting the quality and quantity of fuel.

On a VAZ 21083, the correct mixture is obtained with the following settings:

Quantity screw: 1.5 – 2 turns;
Quality screw: 4 – 4.5 turns.

After installing it on the VAZ 2106, it is necessary to configure the device after the engine has run at all speeds. And also, the fuel must be heated to operating temperature.

After installation, the characteristics of the Six engine will acquire several pros and cons.

The advantages are that the engine will be more responsive, the maximum speed will increase (up to 160 -165 km/h), and the acceleration time to the first hundred will be reduced (instead of 15 seconds - 13). The modernization will not significantly affect the rated power, increasing it by 5 - 10 hp.

The only downside is fuel consumption. With normal, non-economical driving in the urban cycle, it will increase by 1 - 1.5 liters.

The general conclusion is this: installing this carburetor is a necessary thing, because for the price of 1 - 1.5 liters per 100 kilometers, you will get more driving comfort.

Installation process

Now you can start installation:

To protect the collector from dirt, the engine compartment must be thoroughly washed.
Then the drives and cables, as well as hoses, are disconnected from the standard carburetor.
To remove the choke cable casing, remove the bracket from the choke panel.
The surface of the collector is carefully cleaned and sealant is applied.
After these operations, you need to install gaskets in the form of a sandwich. First the thin one is placed, then the thick one, then the thin one again. The purpose of a thick gasket is to provide thermal insulation. And to make the installation process more convenient, the carburetor is installed on the manifold without a cover. The damper drive must be at the front of the car.
They mount the throttle valve linkage - on the VAZ-2104 it will be more convenient if it is on the cylinder head side. The slide or “helicopter” is sometimes sawed through the center so that it fits evenly on the carburetor. And so that in normal operation the damper does not jam on the spring, plastic tips are installed on the rods.

Next, pull the choke drive cable over the cylinder head cover and adjust it to the required length. Adjustment is carried out by changing the length of the casing. The cable is then connected to the carburetor.
After this, you can install the top cover.
Next, the fuel supply, return, and heating hoses are connected to the carburetor. The return hose is equipped with a check valve. The return spring clings to the axis of the old rocker on the cylinder head cover.

Recommendations from specialists for adjustment 21073

With standard jets, Solex will not be able to impress with its dynamics. In this case, you can replace the carburetor with 21073. Without changes, installation is quite possible, but as a standard, a lean mixture will be prepared in the first chamber. Therefore, in the first chamber the motor will not be able to provide sufficient thrust for acceleration. The car will pick up speed very slowly.

The pace of movement will improve dramatically when the second chamber opens. And the car will jump forward like a goat. But fuel efficiency is very low.

The problem can be solved by selecting the main fuel jet in the first chamber of the carburetor. If you replace it from 107.5 to 110, you can get improved overclocking intensity. This is a compromise between economy and dynamics. Optimally - the 115th fuel jet in the first chamber. You can also set it to 117.5. But the consumption will increase even more. The mixture with this jet becomes over-rich, and the dynamics may worsen.

The air jets of the first chamber are 145, 150, 155. With a fuel jet of 117.5, you can install an air jet of 165.

BRIEFLY ABOUT THE FEATURES AND DEVICE OF THE “SIX” CARBURETTOR UNIT

Before adjusting the carburetor on a VAZ 2106, it doesn’t hurt to know its design features. After 1980, Ozone and Solex began to be installed on Tolyatti cars. The purpose of the unit’s operation is to prepare a combustible mixture before feeding it into the car’s cylinders. Down to the subtleties, this is not a driving school, we will not disassemble the design, it is enough to familiarize yourself with the main components that ensure optimal operation of a carburetor internal combustion engine:

Fuel dosing system.
Mechanisms for controlling throttle valves and enriching the mixture.
Idle system.
Accelerator pump and econostat.
Float chamber.

A chamber with a float and a needle valve is responsible for the stability of the fuel level. Next, gasoline, flowing through the spray tube, enters the chamber, where it mixes with air from the inlet pipe. The amount of mixture is adjusted by the throttle valve, which is connected to the accelerator pedal.

Precise adjustment allows you to prepare the correct mixture of gasoline and air in a ratio of 1:15. During long-term operation of the car, the settings get lost and you have to think about how to adjust the carburetor on a VAZ 2106 on your own. The adjustment technology is the same for both Solex and Ozone.

WHEN IS ADJUSTMENT NEEDED?

Adjusting the carburetor unit is no more difficult than adjusting the clutch drive on a VAZ 2107, since it only involves adjusting the jets. In some cases, they need to be cleaned of resins and other contaminants; the presence of contaminants is felt by power dips in the process of accelerating. Many car owners claim that Ozone carburetors are not a very good option and recommend replacing them with Solex.

However, the signs that the device has begun to prepare an enriched mixture and needs to be adjusted are the same for both types of units:

Increased fuel consumption.
Frequent overheating of the motor.
Black smoke from the exhaust pipe and pops.
Loss of power.

The preparation of a lean mixture is characterized by the following characteristics:

Popping sounds in the carburetor.
Loss of power.
Engine overheating.

Of course, you don’t always need to immediately grab a screwdriver and turn the adjusting screws - perhaps it’s something else. For example, when the idle speed floats, air may leak through the intake manifold gasket, or there may be a breakdown of the brake booster diaphragm. But even the reasons listed are not all the options, so specific recipes for eliminating certain problems cannot be given. The issue should be addressed comprehensively, taking into account the connection between vehicle systems.

Preparing for work to replace the carburetor

It won’t be possible to simply swap the power supply units of the internal combustion engine, since the VAZ 2107 has a different control system and it is impossible to install a Solex carburetor from the VAZ 2108 model without modifications. If you already have a carb from the “eight”, then you need to purchase a Solex installation kit for the “classic”.

It consists of the following elements:

choke cable from 2108-09;
two thin gaskets for the carburetor (paper/paronite);
one thick gasket for the carb from getinax;
tee for gas hose;
fuel hose 80-90 cm;
check valve 2108;
accelerator link with throttle rods 2108-09;
clamps for the fuel hose 6-8 pcs.

To dismantle and subsequently install the power supply, you will need a tool. It includes: pliers, open-end wrenches 7, 8, 10, 13 mm. Screwdrivers: slotted and Phillips.

For reference! If the car is equipped with an old type distributor, then a contactless ignition should be installed on the vehicle. The fact is that Solex 21083 is designed for operation on a lean mixture. To ignite it, you will need an enhanced charge, which an ignition coil with a power of 25-30 kW can produce. An additional condition is to unscrew the spark plugs and set the gap on the electrodes to 07 - 0.8 mm.

Carburetor adjustment: setting the fuel level

The level of fuel in the float chamber affects the composition of the mixture in any operating mode of the carburetor, the toxicity of exhaust gases, the dynamics of engine operation and fuel consumption. Work order:

Unscrew the carburetor cover mounting screws and install it in a vertical position. A prerequisite for its installation is light contact between the float tongue and the needle ball. Using a special gauge, measure the gap between the bottom surface of the float and the plane of the cover (taking into account the cardboard spacer)

It is important that the gap is 6.5+0.25 mm. If the gap size does not match, the value is corrected by bending the float tongue. Finally, check the float stroke, which should be 8.0+0.25 mm.

Replacing the carburetor

We remove the old carburetor and install the VAZ 2108 choke cable on the car, which is included in the repair kit for the classic. We clean the mounting area on the intake manifold from burnt particles of the old gasket (after covering the hole with a rag so that no dirt gets into the manifold). We install gaskets under the carburetor in the following order: paronite, getinaks, paper. Next, the carburetor itself, previously purchased for a classic (in our case Solex-21083), must be installed.

While the power supply is not screwed in, it is necessary to install the bracket for the rocker from 2108 from the repair kit on the two studs (closest to the engine). Then you can tighten the fastening of four nuts. The two-arm throttle lever must be removed from the valve cover. We change the short rod from the gas pedal to a long one. We install the converted two-cranked lever (link) on the bracket, adjusting the structure to size. The final stage in working with the mechanism is installing the return spring on the lever. The operation of the drive should be checked and adjusted if necessary.

The procedure for removing the carburetor from a VAZ 2108

The procedure for removing and installing a carburetor from a VAZ 2107 is described on our website here .

Fuel hoses and check valve

Fuel hoses must be connected to the installed power supply unit. The design feature of Solex-21083 is that it has a “return”. Some people prefer to mute it.

However, installing a check valve and a tee on the gas hose would be a better solution:

it won’t take much time, only 5-10 minutes;
The system helps save fuel.

We cut the tee in front of the fuel filter. Then, to the tee we attach a hose with a check valve coming from the carburetor. We secure the gas hose connections with clamps.

Solenoid valve connection

After a foreign carburetor from the VAZ 2109 model has been installed on a VAZ 2107, it is necessary to ensure its correct operation. It is necessary to make sure that the solenoid valve operates from the ignition switch. You can turn off the EPHH and remove the needle, but then the car will twitch when the engine is turned off.

Necessary parts for the operation:

BSZ switch connector assembly (with wires);
electrical connector with 4-pin connector (assembled);
EPHH control unit;
pair of single-pin connectors assembled.

It is necessary to solder the 4k and 1k plug wires to the switch wires (using the pinout method). A detailed diagram is shown in the photo.

After the operation has been completed, you should install the modified unit on the car.

Heating

The newly installed internal combustion engine power unit must be heated for the throttle valve. To do this, disconnect the cooling system hose from the intake manifold and connect it to the carburetor heating pipe. Secure all connections with clamps. Make a separate hose for the collector. Thanks to the heating of the carburetor, frost will not freeze on the valves in cold weather, leading to unstable engine operation.

Solex carburetor system 21083

In general, this carb is usually installed on engines with a transverse installation, but some people argue that it works great on cars with a longitudinally installed engine, in other words, on classics.

By type, this carburetor is classified as an emulsion carburetor, which has two chambers that open alternately. The carburetor also has a transition system, an economizer, an accelerator pump, and a forced idle system.

https://youtube.com/watch?v=gWwZJETZFSI

Today Nail Poroshin will tell and show the main nuances of the installation

53rd
Carburetor
for
Classic
! Everyone.

In principle, all this is enough for the carburetor to work successfully on a classic car. After installation, the carburetor is immediately ready for use; all that remains is to adjust the idle speed and correctly set the fuel level in the float chamber. If you install a carburetor on the 2108 engine, then the mixture formation may turn out to be quite poor. In this regard, it will be necessary to replace the fuel jets with larger ones.

Jets are always selected depending on engine size. Moreover, everything happens in inverse proportion; smaller jets are installed on large-volume engines and vice versa. The thing is that on a large-volume engine, more air will pass through the diffuser, and at a higher speed, so the fuel will be drawn in more easily.

It is best to immediately choose such a Solex

, which is suitable for the volume of a given engine.

Setting up a V8 carburetor on a VAZ 2107

After Solex-21083 is finally installed and engineering work is completed, it is necessary to adjust the carburetor. The adjustment takes place on a warm engine. You will need a slotted screwdriver.

The setup sequence is as follows:

it is necessary to unscrew the mixture quality screw until the engine increases rpm to 1200;
go to the quantity screw (with a plastic handle) and by rotating it, reduce the engine speed to 1000 per minute;
we return to the quality screw and slowly tighten it until the tachometer needle is at 850-900 rpm.

After this, you can do a short test drive on the modernized “Seven”. Then unscrew the spark plugs and check the carbon deposits on the electrodes. If it is black, then reduce the fuel quality ½ turn. If it’s white, then add it on the contrary.

Do-it-yourself carburetor idle adjustment

To solve the problem of how to adjust the idle speed on a VAZ 2106, you need to stock up on a set of driver’s tools, although one screwdriver is enough for this technological operation. On the Internet you can watch the “VAZ 2106 idling” video clip about carrying out adjustment work to stabilize the idling speed of the vehicle.

To adjust the idle speed of the “six” carburetor, a number of preparatory conditions must be observed. These include:

The operation is carried out only on the motor that has reached operating temperature (about 90 degrees Celsius).
The clearances of the timing valves and ignition contacts (with a contact system) must correspond to the required dimensions.

When adjusting the idle speed of a VAZ 2106 carburetor on a cold engine, the required result cannot be achieved. If there is no idle speed, it will appear only if the correct adjustment conditions are met.

If the VAZ of the “sixth model” stalls at idle, then to find out how to adjust the idle speed, you need to use the following algorithm:

The process of adjusting the idle speed on a VAZ 2106 car is carried out using two screws for adjustment, the first is the quality screw, the second is the quantity of the mixture.
In accordance with the factory parameters, the quantitative adjusting screw is locked with a sealed limiter sleeve. To carry out adjustments and when there is no idle speed on the VAZ 2106, the seal is removed and adjustment work is carried out.
Using a high-quality screw, we achieve a value of 900 rpm, checking the value with the tachometer readings.
Using the quantity screw, we use a gas meter to set the carbon monoxide value in the range of 0.6-1.3 percent. The circular movement of the adjusting screw changes the number of rotations of the crankshaft of the power unit.
In this situation, we re-fix the required crankshaft speed parameters with the first screw. If everything is done correctly, then when you sharply press and lower the accelerator pedal, the rotation value should remain stable.
If all operations are performed correctly, there should be a smooth increase in engine speed and the unit should operate stably.

If the idle speed floats or the VAZ 2106 engine operates spasmodically, that is, jerkily and unevenly, then the unit settings need to be restored. Upon completion of the setup, the power plant should produce stable speed.

You need to know how to set the idle speed of the VAZ 2106 in order to adjust the carburetor. You can perform this procedure quite quickly with your own hands, if, of course, you have an idea of what a carburetor consists of and the functions of its main components. But first things first, let's start with the saddest thing - the case when suddenly there is no idle speed and the engine starts to stall.

You'll be lucky if this happens close to home. But if you’re on the road, it’s not good enough. On my own behalf, I’ll add that several times I had to remove and disassemble the carburetor while standing on a narrow highway, shying away from passing trucks and highlighting it with a flashlight. A good habit is to take a thermos and a flashlight on the road.