VAZ 21124, engine: features and characteristics

The VAZ-21124 engine is a 16-valve representative of the line of power units produced by JSC AvtoVAZ since 2004. In fact, this model was the result of another improvement in the VAZ-2112 engine and was installed on production cars: VAZ-21104, 21114, 21123 "Coupe", 21124, 211440-24. Later it was used to create more powerful installations: VAZ-21126 and VAZ-21128 engines of the production enterprise Super-auto.

Engine Specifications 21124

In general, the power unit remained quite traditional, i.e. four-stroke, with one row of cylinders, an upper camshaft arrangement and a distributed fuel injection (injector).

• Cooling - forced, air-liquid.
• The volume of the cylinders is 1599 cm ³ .
• The work of the cylinders is standard - 1-3-4-2.
• Power at 3800 rpm. - 98 l / sec.
• The number of valves is 16 (four for each cylinder).
• The diameter of the bottom of the cylinder is 82 mm.
• The length of the piston stroke is 75.6 mm.
• The compression ratio of the mixture is 10.3.
• The minimum speed of rotation of the crankshaft is 800-850 rpm.
• The recommended grade of gasoline is AI-95.
• Fuel consumption: in the city - 8.9 liters, on the highway - 6.4 liters, in a mixed mode - 7.5 liters (distance 100 km).
• The working volume of the oil sump is 3.5 liters.
• Weight - 121 kg.
• The technical resource of the engine 21124 to the first overhaul, claimed by the car factory - 150 thousand km (almost a car can go 100 thousand km more).

The cylinder block of the power unit 21124 and its features

First of all, the updated cylinder block differs from its predecessor in its height (the distance between the axis of rotation of the crankshaft and the highest point of the block): in the VAZ-2112 it was 194.8 mm, in 21124 it was 197.1 mm. Due to this, the volume of cylinders increased (up to 1.6 cm ³ ).

For fixing the head, the diameters of the bolt holes have been changed, now their threads must correspond to the dimensions M10 x 1.25.

Another feature of the improved unit is the special nozzles built into the bearings of the main bearings (2, 3, 4 and 5). During the operation of the motor, oil is supplied through them, which cool the piston head.

The engine 21124 has a crankshaft whose crank (R = 37.8 mm) provides an increased stroke of the piston. The same crankshaft with the "11183" mark, cast on its sixth counterweight, is installed on the power units 21126 and 11194.

The pulley for the operation of the gas-distributing mechanism is marked "2110-1005030". And the transverse profile of its teeth is a parabolic shape.

A damper through which the generator drive is driven by a poly-V-belt , as well as additional units not provided for in the basic configuration, due to the special arrangement of its pulley, the torsional vibrations arising on the shaft are significantly damped. And the master disk entering the damper design allows the special sensor to read the crank angle.

Driving belts used in the engine and their marking

To operate the timing mechanism in the design of the 16-valve engine 21124 belt is used with a width of 25.4 mm, which has 136 parabolic teeth and is marked as "2112-1006040". The resource before a possible replacement is 45 thousand km.

If additional add-on units are not installed on the motor, namely the SUR pump and the air conditioning compressor, then the belt with the marking "2110-3701720 6 PK 742" (working length - 742 mm) is used in the generator drive.

If the GUR pump is installed, a belt of a different size, 1115 mm, is installed to drive the generator. Its marking is "2110-1041020 6 PK 1115".

The model with the compressor for the air conditioner has an even longer generator belt - 1125 mm, with the marking - "2110-8114096 6 PK 1125".

Piston group features

The renewed engine also received new pistons, with valve holes in the bottom: four pistons of depth 5.53 mm are made in each piston, which are designed to prevent the valves from buckling (breaking) if the timing belt is broken.

Earlier, if this happened, the connection of the valves to the crankshaft was lost, their movement ceased, but the shaft, carried by the flywheel, continued to rotate by inertia, and accordingly, the pistons also moved. As a result, they collided with the valves. The result - they bent, broke or even pierced the bottom of the piston.

The dimensions of the piston rings, which can be both cast iron and steel, remained the same: 82 mm.

The piston pin has a floating fit, and its axial fixation is provided by the locking rings. The length of the finger is 60.5 mm, and its diameter is 22 mm.

The connecting rods of the engine 21124 are interchangeable with the 2112 connecting rods.

Cylinder Head

The 16-valve cylinder head differs from that installed on 2112, only the increased surface area allocated for the installation of the intake manifold flanges.

To control the valves in the upper part of the cylinder head, two camshafts are installed: one for the intake group, the other for the exhaust manifold. To distinguish them, the manufacturer puts stamps that are on the neck of the shafts behind the second cam. If the last digit is 14, then the shaft is exhaust, if 15, then, respectively, the inlet. In addition, the inlet camshaft next to the first cam has an untreated metal band.

Since the head is provided with hydropushers, this saves the car owner from adjusting the thermal gaps between the cams and the valves.

However, this convenience forces the driver to carefully monitor the cleanliness and quality of the oil, since the mechanism of the hydro-pusher is very sensitive to foreign impurities in the lubricant, the presence of which can lead to its failure, and it is not subject to repair, only complete replacement.

Valves of the valves of the sixteen-valve motor have a diameter of 7 mm, in the eight-valve they are 1 mm larger.

As already mentioned above, the camshafts rotate due to the belt drive coming from the crankshaft. The marks for correct setting of the working phases of the motor on pulleys 21124 are offset by two degrees relative to the same marks applied to the pulleys of the power unit 2112.

The cogwheels of the intake and exhaust shafts differ from each other and are marked by their marking: the inlet - "21124-1006019", the exhaust - "21124-100606020". In addition, the intake pulley has a circle near the hub and a curtain on the inside, at the outlet there is no such curtain.

Inlet-outlet system

In the design of the intake system, a plastic pipeline is used, which simultaneously performs the functions of both the intake manifold and the receiver.

As an element of the release, the engine designers used a catcher collector, a unit that had not previously been used in the VAZ models and which is a neutralizer that is integral with the intake pipe.

Features of the fuel system and ignition system

First of all, it should be noted that the VAZ-21124 uses a new type of fuel ramp, made of stainless alloy and different from the one that stood on the VAZ-2112, primarily due to the fact that there is no drain line in the fuel system. The required gasoline pressure in the pipeline is maintained by means of a special valve installed in the fuel pump.

As for the ignition system, the special thing about it is that high-voltage wires were excluded from its design. The fact is that on the engine 21124 each candle received a separate ignition coil.

The coils are fixed directly to the candles and, in addition, have an additional fastening to the cylinder head cover. Thanks to this innovation, the reliability and efficiency of the ignition system has increased at times.

Engine operating temperature 21124

Many car owners of VAZ cars know that the working temperature of the engine is 90 degrees Celsius. However, with the advent of 16-valve engines of the VAZ-2112 series, this norm has become not so unambiguous. The fact is that with the introduction of environmental requirements, the engines were modernized, and in connection with this, the manufacturer changed the temperature range for them. Now the temperature fluctuations of the engine within 87-103 degrees is considered the norm.

In conclusion, it should be mentioned that engine oil 21124 should correspond to the viscosity of 5w30, 5w40, 10w-40 or 15w-40. The dry engine includes 3.5 liters of lubricating fluid, but after draining about 800 grams it remains in the crankcase, respectively, with a repeated replacement the poured volume will decrease.