Today, many owners Classics (Vaz-2101, Vaz-2102, Vaz-2104, Vaz-2105, Vaz-2106, Vaz-2107) installed on their cars contactless electronic ignition... And this is natural. Advantages contactless ignition obvious and proven in practice. For example: ease of installation and adjustment, reliability and accuracy of operation, significant improvement in engine starting in the cold season. It seems to me that the list of "pluses" is not bad !? And if you are not a conservative, you were pretty fed up with the "quirks" of the contact pair and for certain reasons, you have not yet decided to buy a contactless ignition kit, then this article (I hope) will help you take the last step. Since, in fact, you should not have big difficulties and problems when installing the "new thing". For example, it seems to me that the biggest problem is the purchase of the kit itself. After all, you need to force yourself to part with a tidy sum;)))

Now from the introduction, let's move on to the main thing. Choosing, buying and installing on your beloved and invincible Classics (Vaz-2101, Vaz-2102, Vaz-2104, Vaz-2105, Vaz-2106, Vaz-2107) kit contactless electronic ignition.

Choice and purchase: from myself I can advise you to opt for a set contactless ignition of Russian production, the city of Stary Oskol- look at photo 1. In the box we find - coil, switch, distributor and wiring harness(photo 2). In terms of quality, this kit is considered one of the best. True, and the price, "bites"))) Also, look at which engine block you have, since the distributors are of two types (differ in the length of the shaft) - for the engine Vaz-2101, Vaz-2102, Vaz-2104, Vaz-2105 and Vaz-2103, Vaz-2106, Vaz-2107.

Preparing for installation- a drill, a drill and a pair of self-tapping screws (a standard mounting place is provided for the coil in the engine compartment, but the switch will have to be fastened independently), an open-end wrench for 13, ring or socket wrenches for 8 and 10. In order to put the engine on the "TDC "You need a key for 38.

We can start replacing:

We take the 38 key and turn the ratchet nut until the marks on the crankshaft pulley and the front engine cover coincide, that is, we set the engine to the “TDC” mark (photo 3).

We remember the location of the distributor and the slider; the new distributor will be placed in this position. In my case, the slider is turned towards the valve cover and "stands on the fourth cylinder" along the distributor cover (photo 4). This is his correct position.

We also find the B + mark on the coil and remember which wires are screwed to it (photo 5). Then we unscrew and remove the coil.

Using a 13 key, unscrew the distributor lock nut and remove it. We try not to lose the gasket - photo 6.

We fix the switch, fasten the black wire “to ground” (photo 7). We install and fix the coil to the body. We connect standard wires to the corresponding terminals (pay attention to the location of terminals B and K on the new coil - photo 8). The wires from the switch are marked with + to terminal B, the second wire to terminal K - photo 9.

We install the distributor, do not fully tighten the lock nut. We connect the wires from the switch to the distributor (photo 10). We check the position of the distributor and the slider (photo 11), put on the cover and connect the wires in the order 1-3-4-2 (photo 12).

After everything is fixed, we can start the engine and start adjusting the ignition "by ear". But if you have a strobe, you can use it))). To do this, with the engine running, slowly turn the distributor (the lock nut, we did not tighten it for this) "back and forth" (photo 13) and look for the middle position in which the engine speed will be the highest and evenest.

When using an article or photos, an active direct hyperlink to the site www.!

Some owners of classic cars of the VAZ 2101-07 family are constantly trying to improve, modify, add electronics and convenience. One of these improvements is the installation of a contactless electronic ignition.

Which ignition is better: contactless or contact?

Contact ignition is outdated, but still used in older cars. On rear-wheel drive VAZ models, the contactless was first installed on 2107.

Let's analyze the differences between contact and non-contact ignition:

Advantages of non-contact ignition:

• since there is no contact group in the distributor, sparking occurs clearly;
• long service life of the coil;
• at medium engine speeds, BSZ creates a spark 4 times more powerful than contact ignition. This is especially useful if the spark plugs are dirty, as a spark will still be generated;
• perfectly performs its functions even in frost;
• if the voltage in the power grid is low, then sparking will still occur;
• thanks to the powerful stable spark of the candles, the ignition of the fuel-air mixture is faster;
• if BSZ is installed, then fuel consumption decreases and engine power increases;
• the dynamics of acceleration of the car is improved;
• BSZ is easier to maintain because there are no moving parts in the device.

Contactless ignition system device

The BSZ device for carburetor engines consists of:

Electronic and non-contact ignition systems are one and the same device. It got its name due to the absence of a contact group in the system device. There is also, which is a common cause of engine start failure.

Trambler device:

• frame;
• cam;
• movable contact (slider).

Electronic ignition connection diagrams: VAZ 2101-VAZ 2107

Diagram of a contactless ignition system for VAZ cars:

1 - switch; 2 - ignition coil (bobbin); 3 - distributor; 4 - ignition lock key; 5 - Hall sensor.

How contactless ignition works

The sequence and principle of operation of the BSZ is as follows:

1. The driver turns the ignition key.
2. The circuit is closed and a constant voltage is supplied to the primary winding of the ignition coil from the battery. The energized primary winding generates a magnetic field around itself.
3. When the starter starts, it starts to rotate the crankshaft of the internal combustion engine and rotates the shaft, which is located inside the distributor along with the slider.
4. The hall sensor records how the distributor shaft rotates (along the protrusion on the shaft) and transmits a signal to the commutator.
5. The electronic unit cuts off the voltage supply to the primary winding according to the signal from the Hall sensor.
6. When the voltage supply circuit is interrupted, at this moment a high voltage pulse appears up to 24 kilovolts in the secondary winding of the coil, which is transmitted through a thick wire to the slider (moving part of the distributor).
7. Fixed contacts are integrated on the roof. The runner throws an impulse at one of these fixed contacts. From the contact that received a high voltage pulse, it is transmitted through high-voltage wires to the spark plugs of those cylinders in which the pistons are at top dead center.
8. When the spark plug is energized, there is already fuel and compressed air in the combustion chamber of the cylinder for ignition.
9. The distributor slider rotates from the spark to all candles according to a certain sequence pattern: 1-3-4-2. Depending on how to set the slider, the whole operation of the system depends, we have learned in another material.
10. The car engine starts.

They are interchangeable, and sometimes they are not repairable.

Diagram of an outdated VAZ ignition system (without a switch)

1 - distributor (distributor); 2 - breaker; 3 - capacitor; 4 - ignition coil (bobbin); 5 - battery; 6 - ignition lock; 7 - spark plugs.

Such a scheme in systems where there is no switch. The circuit is broken mechanically using a breaker.

Cons of contact ignition:

1. The contacts burn and oxidize due to which the power of creating a spark decreases.
2. There are wear parts that are recommended to be changed every 20 thousand km. mileage.
3. Converted power in contact systems up to 18 kilovolts. Electronic or contactless - up to 24 kilovolts.

Cons of contactless ignition:

Selection of BSZ

When buying a new BSZ, you should pay attention to the presence of the components of the entire kit. The factory kit should contain:

1. 1. Trambler (main distributor). The code for engines 1.5 and 1.6 is 38.37061. For 1.3 engines, the number will be 38.3706-01, because the height of the 1.3 engine block is lower and the distributor shaft is shorter.
   2. Switch with number 36.3734 or 3620.3734.
   3. High voltage coil (bobbin). Marking 27.3705
   4. Thin wires with connectors.

In appearance, the BSZ set for the VAZ 2121 "NIVA" car is very similar. But it is better not to put this kit on the Vaz 2107 or on the Vaz 2106, because the characteristics of the "six" and "seven" are very different from the "field". Trambler brands for Niva: 3810.3706 or 38.3706-10.

The best manufacturer of electronic ignition systems for old VAZ cars is SOATE. The base of the production capacity is located in the city of Stary Oskol. According to the reviews of car owners of classic BSZ SOATE models, an excellent option.

Installation of contactless ignition VAZ 2107, 2106

To install the BSZ with your own hands, you will need the following tools:

• Screwdrivers (flat and Phillips);
• Open-end wrenches for 8, 10, 13 mm;
• Pliers (pliers);
• Candle wrench;
• Drill or screwdriver with a drill diameter of 3-3.5 mm. You will have to drill two holes in the body to secure the switch.
• A special key for rotating the crankshaft of the internal combustion engine or a conventional open-end 30 mm.

An inspection pit for installing the ignition is not required. Here, in fact, is the very procedure for removing the old contact ignition:

The procedure for installing a contactless electronic ignition on a VAZ 2106-2107.

1. Drill and attach the switch next to the coil. But, do not put it under the liquid tanks.
   
2. Remove the cover of the new distributor and put on the gasket.
   
3. Install in the distributor seat so that the movable contact is opposite the drawn mark on the valve cover. Do not tighten the nut immediately to the stop.
   
4. Install a new coil where the old one was. It is necessary to connect the wires from the ignition switch relay, tachometer, switch to the terminals of the bobbin. The wire from the electronic unit numbered 1 is connected to the coil terminal marked "K", the wire from the 4th contact is connected to the coil terminal marked "B".
   
5. Check the spark plug gaps (should be 0.8-0.9 mm) and screw in place.
   
6. Snap the distributor cover and connect the high-voltage wires (central from the coil and 4 wires to the candles). We connect the wires to the candles strictly according to the designations.
   
7. Connect the vacuum hose.

After installation in the correct sequence, we start the engine and begin to adjust the ignition. If, after installing a new electronic contactless ignition, the engine does not start, you should check the correct connection of the coil and high-voltage wires to the spark plugs. If the wires are normal, then the marks are not aligned.

Installation of electronic ignition on video on classic cars VAZ 2101-2107.

In this video, all the nuances are chewed.

How to adjust the proximity ignition

Before adjusting the ignition on VAZ 2101-2107 cars, you need to warm up the engine a little, preventing it from stalling.

It can be adjusted either by ear or using a special device called a stroboscope for setting the ignition.
A stroboscope is a device with which even a beginner can correctly set the ignition. For more information on tuning the ignition with a strabo scope, see the video.

VAZ-2101 was the first model to come off the assembly line of AvtoVAZ. At the time of its appearance, it was a relatively modern car. But at the moment, when the production of this model was discontinued more than 30 years ago, 2101 is hopelessly outdated. Although the "firstborn" of VAZ is still traveling on our roads.

The owners of this car are always trying to keep it "alive" by altering and reworking some of the elements and systems. One of the systems that definitely requires replacement on the VAZ-2101 is the ignition system.

"Native" ignition on the VAZ-2101 was contact. In such an ignition, the distributor supplied a spark to the desired spark plug at the moment the contact pair opened. The disadvantage of this ignition is the need for periodic checking and adjustment of the gap between the distributor contacts. In addition, during operation, contact burns are not uncommon, due to which the quality of the system is significantly reduced. Because of this, each owner of the VAZ-2101 had a diamond file in the tool kit for periodic cleaning of the contact surface.

Advantages of contactless ignition

On newer models, contactless ignition is already used, it is also electronic. In such an ignition, there is no longer a contact pair, the spark is supplied due to the contactless operation of the Hall sensor, which provides significant ease of use. Such an ignition is much easier to maintain, and its work is better than a contact system.

A very important fact is that on newer models using electronic ignition, many elements are unified with the same "Penny". Indeed, for the quick adjustment of the production of a new model, many of the components of the previous models were the basis for the creation, but with certain modifications. Therefore, the installation of a VAZ-2101 contactless ignition is quite possible. Moreover, there is no particularly difficult work in this, and the owner of this car can be done by himself in a garage.

In fact, in order to install an electronic ignition on a VAZ-2101, you only need a complete set of elements for such an ignition and subsequently correctly connect them together. After all, almost all seats, and only the distributor is important, are the same both on the contact system and on the contactless one. That is, nothing in the engine will have to be altered at all.

With a serious approach to this issue, not so much time will be spent, 3-4 hours will be quite enough, but in the future this will save a lot of time that was spent on maintaining the contact system.

What you need to re-equip the ignition system

So, in order to install contactless ignition on a VAZ-2101, you first need to purchase all of its components. You can buy all items from the newer VAZ model. Below are the markings of all elements that are best used:

• Switch (model K563.3734 TU11 KZHSCHG 023-94), which also includes an emergency switch (model K562.3734). In fact, these are two separate switches connected together. The presence of an emergency switch will ensure that the system is operational even if the main switch fails;
• A set of candles (model A17DVR or their analogs);
• Distributor sensor, also known as a distributor (model 38.3706);
• Ignition coil with open magnetic circuit (model 27.3705);
• Wiring harness with plugs for connection;
• High voltage wires with ferrules (if the “native” wires are in excellent condition, it is not necessary to buy new ones);

When buying a distributor, it is important to make sure that the distributor model 3810.3706 is not sold under the guise of the desired distributor. This distributor is used on the "Niva", in appearance the indicated models are identical, but the "Nivovsky" has different performance characteristics, in particular, a centrifugal regulator and a vacuum regulator.

Also, in order for the VAZ-2101 contactless ignition system to "take root" on your car, you will need a certain tool:

• Candle wrench;
• Open-end wrenches (for 8, 10, 11, 12, 13);
• Pliers;
• A set of probes (will be needed in sizes 0.7-0.8);

Installation of ignition elements

With all this assembled, you can proceed with the installation. There is a certain scheme, contactless ignition of the VAZ-2101 according to which it is mounted, but it is not necessary to follow it, the order of work can be changed, only the final result is important.

So, we mount the VAZ-2101 contactless electronic ignition:

1. Unscrew the old candles with a candle key, and in their place we install new ones, having previously checked and installed a gap between the electrodes of 0.7-0.8 mm on them;
2. Installing the switch... Since there is no seat for it, you will have to choose it yourself. The best place for installation is the rear wall of the engine compartment. There you will find the platform you need in size, and the switch will not interfere in the future, the main thing is that access to it is easy. For fixing, you can use a drill to drill holes. Then the switch is secured with bolts and nuts. But you can also fix it with self-tapping screws. An important condition is the maximum adhesion of the switch to the surface, to better ensure its cooling.
3. Remove the cover on the "native" distributor and turn the crankshaft until the slider is in the position corresponding to the TDC of the first cylinder. Additionally, check the alignment of the marks on the knee pulley. shaft with risks on the timing cover. The pulley mark should line up with the middle line.
4. We unscrew the fastening of the "native" distributor and remove it. On the new contactless distributor, before installing, we also remove the cover and set the slider to a position that is identical to the position on the old one. Then we put it in place of the extracted one and attach the nut of its fastening, but do not tighten it.
5. A Hall sensor is installed on the side of the contactless distributor to be installed correctly. To do this, we rotate the distributor body until its central electrode coincides with the edge of the near technological window, on which the beginning of the spark supply depends. After installing the Hall sensor in the desired position, tighten the distributor mount.
6. Letting the ignition coil mount, having previously disconnected the high voltage wire from it, going to the distributor. The rest of the wires do not need to be disconnected from it. In place of the "native" coil, we install a new one and fix it.

Possible malfunctions

If the car does not start, you should first check that the wiring is connected correctly. You can also unscrew the candles and check for a spark.

It is quite possible that the distributor was incorrectly set during installation, in particular, the Hall sensor did not coincide with its center with the edge of the technological hole, as a result, the sparking moment was violated.

To eliminate the malfunction, it is necessary to make a new adjustment with preliminary installation of marks on the pulley with risks on the cover, setting the position of the slider, and then install the Hall sensor.

It is also possible that the contactless ignition of the VAZ-2101 does not work because one of the constituent elements is simply faulty. Therefore, before installation, it is advisable to check the switch, distributor and coil on a car equipped with such an ignition system.

Using electronic ignition on the VAZ 2107 turns out to be much more effective than contact ignition. To understand the benefits of installing a contactless system, it is necessary to briefly review the history of its development. And, of course, it is worth starting with the contact system, it was with it that development began. It is also necessary to carefully study the main components of the ignition, to determine what functions they carry out. It is also worth noting that the installation of electronic ignition allows you to achieve higher performance and reliability of the entire car.

The main elements of ignition systems

The main elements include spark plugs, armored wires, coils. These are the nodes that are present in any system. True, they have some differences. Of course, the spark plugs are used on all engines the same. When it comes to VAZ cars. Armored wires can be either rubber or silicone sheath. They have both pros and cons. For example, silicone is more susceptible to destruction of the inner conductive layer.

And wires in a rubber sheath do not tolerate low temperatures well - they become hard and lose their elasticity. despite the fact that they have the same functions, they are also different. If the breakdown voltage in the contact system should be 25-30 kV, then the electronic ignition system works with a value of this parameter of the order of 30-40 kV. And if in these two systems one coil is used, then the microprocessor ones are equipped with two or four. One coil for 1-2 candles.

Contact system

This design was popular until the mid-90s of the last century. But it has gone into oblivion, as it is morally outdated. It is based on an ignition distributor, in which the rotor has a small section made in the form of a cam. With its help, a breaker is set in motion - two metal plates isolated from each other. They have contacts that close and open under the action of the cam.

The reliability of this system depends directly on the state of this contact group. The fact is that the contacts switch a voltage of 12 volts, therefore, the risk that they will burn is very high. They also touch, therefore, there is a mechanical effect. Hence, a decrease in the thickness of the contacts, therefore, an increase in the gap between them. For this reason, you need to constantly monitor the status of the contact group. But the electronic ignition system allows you to get rid of such minor flaws.

Contact transistor

This system is a little more perfect, but it is still far from ideal. As in the previous type, there is both a distributor and a contact group. With a slight difference - it commutes a low voltage, less than 1 Volt. More is not required to control an electronic key assembled on a semiconductor transistor. The advantage of this system becomes clear from the above. But the disadvantage still remains - there is a mechanical effect. Consequently, the contacts gradually wear out and need to be replaced. Do not travel for a long time without timely maintenance. Although this is almost electronic ignition on the VAZ 2107, it is still far from the BSZ.

Non-contact system

But the contactless system is already closer to ideal. It does not have a contact group, which is the most vulnerable point. Therefore, it will not need to be serviced. All functions of the interrupter are assigned to the one working on the Hall effect. It is mounted inside the distributor, in the same place where the contact group stood. For the ignition system to function properly, the sensor must function properly. And he will not be able to work without a metal skirt with slots, which rotates in the area of ​​his active element. The electronic ignition circuit has a high degree of reliability largely due to the fact that there is no mechanical interaction of elements in it.

Hall Sensor

When the engine is running, rotation is transmitted to the distributor axis. At the top of it, a slider rotates, which distributes the high voltage from the coil to the spark plugs. At the bottom is the previously mentioned metal skirt. It is positioned in such a way that it rotates in the area of ​​the sensor. Consequently, the latter, under the influence of metal, gives out an impulse. And there are four such jumps per revolution (according to the number of cylinders). Further, this pulse goes to the switch. Installation of electronic ignition is carried out rather quickly, since it contains a small number of elements. Among them it is worth highlighting the switch, but we will talk about it later.

Microprocessor system

This type of system is the most advanced. The reason is that it works by processing data from multiple sensors. It is actively used only on injection engines, since only in them it is possible to control the fuel supply. Absolutely all parameters of the engine are monitored. The signals from the sensors go to the electronic control unit - the brain of the entire system. It is made on the basis of a microprocessor that can perform thousands of operations per second. This type of electronic ignition circuit is quite complex and also requires programming. After all, the microprocessor must know what the user wants from it with a certain type of input signal.

Sensors in a microprocessor system

As mentioned, in this type of ignition system, it is necessary to analyze all the parameters. In particular, with the increased requirements for toxicity, lambda probes began to be used with might and main. The microcontroller circuit of the VAZ electronic ignition allows you to connect several types of reading devices. Of course, the use of lambda probes in cars is controversial, because it is worth looking at how much harmful gases and liquids are emitted by enterprises into the environment. But lawmakers in Europe are the last to worry. Injection sevens comply with Euro-2 and Euro-3 toxicity standards. Unfortunately, at the moment Euro-6 standards are in force.

For normal engine operation, control the speed, crankshaft rotation speed, air entering the fuel rail. The analysis of the CO content in the exhaust system is also carried out, the position of the throttle valve relative to the starting point is determined. In addition, the presence of knocking in the engine is determined every second, adjustment is made. And all this is done by a system that is made on a microprocessor. He conducts thousands of operations in order to timely send signals to actuators (for example, injector solenoid valves). Since it is rather difficult to install electronic ignition of this type on carburetor engines, it is still worthwhile to dwell on the use of BSZ.

Switch

This element is the predecessor of the microprocessor electronic control unit. A switch is used to send a signal to the ignition coil. The only sensor that is involved in its work is Hall. With its help, the moment when the voltage is applied is determined. True, the signal level that comes from the Hall sensor is very small. If it is applied to a high-voltage coil, then the voltage at the output will not be enough to ignite a spark. By the way, the electronic ignition 2106 can be easily installed on the entire model range since its installation is the same.

Therefore, it becomes necessary to use a buffer unit - amplifier. These are the functions that the switch performs. During its operation, a large amount of heat is generated, therefore, the installation of the unit should be approached with all responsibility. It must be mounted so that its rear part fits as tightly as possible to the car body element. Otherwise, a quick failure of the semiconductor elements of the system is possible. The plug used to connect the switch must be protected against dust and moisture.

How to install the distributor

Now it's worth talking about how to mount and configure the electronic ignition on 2107. Installing the BSZ distributor on the classic is similar to the procedure carried out when installing a simple distributor of the contact system. First, align the pulley according to the marks on the engine block. There are three labels that determine the value of the lead angle - 0, 5, 10 degrees. Install the pulley opposite the mark that corresponds to the value of 5 degrees. It is this that is most optimal when working on gasoline with an octane rating of 92.

Now, after removing the distributor cover, install the slider so that it is opposite the outlet that goes to the spark plug of the first cylinder. Now all that remains is to install the distributor body in its place and screw on the nut of its fastening. Next, put the distributor cover in place, clamp it with spring clips. That's it, the initial ignition installation is complete, now you can start fine tuning.

Setting the lead angle

It should be noted right away that the adjustment "by ear" can be carried out, but only in the most urgent cases. For example, if a breakdown caught you on the road and you need to get to the place of repair. In other cases, you need to use at least simple means - for example, an indicator on an LED. It is best if the electronic ignition on the VAZ 2107 is regulated using a stroboscope or motor tester.

If you have a stroboscope, then the task of adjusting the ignition timing is simplified many times. By the way, such a device can even be assembled from an LED flashlight. Install the control output from the armored wire of the first cylinder. Now you need to direct the strobe beam to the crankshaft pulley. Of course, the engine must be started. Rotating the distributor body, make sure that the mark on the crankshaft passes opposite the corresponding serifs on the block clearly at the moment of the flash.

What does the installation of BSZ for the seven give?

But now the praise of the contactless system will begin. It's no secret that electronic contactless ignition is much better than its predecessor. The reason for this is that there is no need for frequent monitoring of the valve and breaker. What does a modern driver need? In order for his car to drive, but did not require from him knowledge in the device of the car and its systems. Note that the more modern the car, the less the owner interferes with its work. The maximum is the replacement of fluids and filters.

And BSZ took a step towards the drivers, it relieved them of the need to constantly check the clearances, adjust the lead angle, and clean the contacts. Now there is a fairly large number of people who can hardly distinguish a gearbox from a piston. Will he be able to do all of the above procedures? Exactly. Therefore, electronic contactless ignition can increase the reliability of the vehicle. And there is no need for frequent adjustments.

conclusions

Analyzing all the pros and cons, one can come to one conclusion - the more modern the ignition system, the more reliable and efficient it is. But if you have a seven-carburetor, then for the installation of a microprocessor system you will need to upgrade the fuel supply. To do this, you need to install a pump, a rail, injectors, an electronic control unit, as well as a bunch of sensors to ensure normal operation. But the simpler way out is to simply mount the electronic ignition on the VAZ 2107. And at a price not very much, and at a cost of time too.

In this article, we will talk about electronic ignition for a car. Let's show the electronic ignition circuit.

In the 90s, I had a VAZ-2101 car, Fiatov assembly, which I got from my grandfather. The quality of the car was such that after the engine overheated with the bursting of the compression rings and the 90-kilometer return home, the overhaul of this engine did not even require boring the cylinder block. The cylinder surfaces at 200,000 mileage were perfect. With a consumption of 7 liters per 100 kilometers, on the track my "kopeck" lacked the fifth gear. One was a significant drawback - rosin-based brains contact ignition system. The breaker contacts burned too often. Digging in the amateur radio literature, I found what my "swallow" was missing - an electronic ignition circuit. After installing this scheme on the car, the consumption decreased to 6.5 liters per 100 kilometers, and there were no problems with ignition interruptions. I switched to Japanese for a long time, but my father - a fan of "classics" never gave up on it. And how many more Zhigulenkov runs around the country? The electronic ignition circuit, which I collected for my "penny", I have long lost, but found another circuit, which almost did not differ from mine. After some refinement, I put together the scheme suggested below for my father, and what is great, his fuel consumption also dropped by about 0.5 liters.

The proposed electronic ignition circuit is intended for installation on vehicles with only a contact ignition system.

The circuit installed to a standard contact ignition system has the following advantages:

• breaker contacts do not burn;
• a circuit is provided to protect the ignition coil from possible combustion as a result of prolonged ignition on without engine rotation;
• the spark is formed in an oscillatory mode, in other words, several short pulses are formed, which improves the quality of combustion of gasoline vapors in the cylinders of the internal combustion engine.

Consider the operation of the electronic ignition circuit:

When the contacts of the SK breaker are closed and opened, the pulse passes through C1, briefly opening VT1, VT2 and VT3. When VT3 is closed, a spark is generated. C3 slightly smoothes the peak of the high voltage pulse appearing between the collector and the emitter of VT3, protecting it from breakdown. When, as a result of self-induction of the ignition coil and the charge of C3, the voltage between the collector and the emitter reaches about 230 volts, a primary breakdown of the VD3 diode occurs. As a result, the current will flow through the primary winding of the coil again. C3 provides a short-term closing delay for the VD3 diode, allowing the ignition coil to saturate. When the diode closes, a second spark is generated, which is slightly weaker than the first. The spark formation process has a damping character, can be repeated several times, and depends on the breakdown voltage of the diode VD3 and the capacitance of the capacitor C3. The duration of each sparking pulse is shorter than one pulse of a conventional ignition system, and the total duration of the ignition pulse burst is longer. This results in multiple ignition of fuel vapors, without reducing the life of the spark plugs. Fuel burns better, spark plug soot is reduced, which in turn reduces gas mileage.

In the case of long-term closed contacts of the breaker, the capacitor C1 is gradually charged through the closed contacts, the current through the capacitor decreases, respectively, and the transistors smoothly close, protecting the ignition coil from possible overheating.

Elements of the circuit: Resistors - any, for a power not lower than that indicated in the diagram. Their ratings may differ from those indicated on the diagram by 20%, the circuit will work reliably. Electrolytic capacitors of any type, for a voltage not lower than that indicated in the diagram. Diode VD1 - any low-power pulse. Diode VD2 - any low-power rectifier. The VD3 diode is used both as a protective diode in the collector-emitter circuit of the VT3 transistor, and as a zener diode. The reverse breakdown voltage of the VD3 diode equal to 200 ... 250 volts determines the speed and amplitude of repeated ignition pulses, therefore, powerful pulse diodes 2D213A, 2D213B, 2D231 with any index, 2D245B, or two 2D213V connected in series are applicable as VD3. It is possible to choose a diode of another type, but with not worse parameters and the specified reverse voltage. Transistor VT1 - type KT361B, V, G, or KT3107 with any letter. Transistor VT2 - type KT315B, G, E, H, or KT3102 with any letter. Transistor VT3 - type 2T812A (KT812A), you can use KT912A, or KT926A.

Please note that the positive terminal of the coil is not disconnected from the general plus of the ignition system, as it may seem in the diagram, but only the circuit is powered from 12 volts available on the ignition coil. Only the circuit breaker - ignition coil breaks. How this is implemented is shown in the following figures. The first shows the standard ignition circuit, the second shows the connection of the electronic ignition circuit.

To connect the electronic ignition circuit, it is necessary to break the black wire leading from the breaker to the ignition coil. The breaker is connected to the input of the electronic ignition circuit, and the output of the coil to the collector of the transistor. The capacitor hanging on the breaker can be left, but it is better to throw it out, it almost does not affect the operation of the circuit. No other "standard" ignition circuits break or switch. It is only necessary to power the ignition circuit: the minus is the car body, and the plus is taken from the other contact of the ignition coil (in the figure - the blue-black wire). All changes are shown in the figure in red.

The entire circuit is assembled on a small board measuring 3.5 x 5.0 cm, placed in an aluminum case measuring 4.0 x 6.5 x 2.5 cm. The transistor is located directly on the case through a mica gasket. It is important to insulate the collector of the transistor from the vehicle body (zero). After assembly, to reduce fuel consumption, it may be necessary to slightly adjust the ignition timing.