VAZ 21124, engine: features and characteristics

2024 Author: Henry Conors | [email protected]. Last modified: 2024-02-12 02:42

The VAZ-21124 engine is a 16-valve representative of the line of power units manufactured by AvtoVAZ JSC since 2004. In fact, this model was the result of another improvement of 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 Super-Auto production enterprise.

21124 engine specifications

In general, the power unit has remained quite traditional, that is, four-stroke, with one row of cylinders, overhead camshafts and distributed fuel injection (injector).

• Cooling - forced, air-liquid.
• Cylinder displacement - 1599 cm³.
• Cylinder operation is standard - 1-3-4-2.
• Power at 3800 rpm. – 98 l/s.
• Number of valves - 16 (four for each cylinder).
• Cylinder bottom diameter - 82 mm.
• Piston stroke - 75.6 mm.
• The degree of compression of the mixture is 10, 3.
• Minimum rotation speedcrankshaft - 800-850 rpm
• Recommended brand of gasoline - AI-95.
• Fuel consumption: City 8.9L, Highway 6.4L, Combined 7.5L (distance 100 km).
• The working volume of the oil sump is 3.5 liters.
• Weight - 121 kg.
• Technical resource of the engine 21124 before the first overhaul, declared by the car factory - 150 thousand km (practically the car is able to travel 100 thousand km more).

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): for the VAZ-2112 it was 194.8 mm, for 21124 it became 197.1 mm. This increased the volume of the cylinders (up to 1.6 cm³).

To mount the head, the diameters of the holes for the bolts were changed, now their thread should correspond to the dimensions of M10 x 1, 25.

Another feature of the improved block is the special nozzles built into the main bearing supports (2, 3, 4 and 5). During operation of the motor, oil is supplied through them, which cools the bottoms of the pistons.

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

The timing pulley is marked "2110-1005030". And its transverse profileteeth is a parabolic shape.

Damper, through which the generator is driven by means of a V-ribbed belt, as well as additional units that are not provided in the basic configuration, due to the special design of its pulley, torsional vibrations occurring on the shaft are significantly damped. And the setting disk included in the design of the damper allows a special sensor to read the angle of rotation of the crankshaft.

Drive belts used in the engine and their markings

The 21124 16-valve engine uses a 25.4mm wide belt with 136 parabolic teeth and is marked "2112-1006040" to operate the timing mechanism. The resource before a possible replacement is 45 thousand km.

If additional attachments are not installed on the motor, namely the power steering pump and the air conditioning compressor, then the generator drive uses a belt marked “2110-3701720 6 PK 742” (working length - 742 mm).

If a power steering pump is installed, then a belt of a different size is installed to drive the generator - 1115 mm. Its marking is “2110-1041020 6 PK 1115”.

Model with air conditioning compressor has an even longer alternator belt - 1125 mm, marked - "2110-8114096 6 PK 1125".

Features of the piston group

The updated engine also received new pistons, in the bottom of which valve holes are provided: each piston has four recesses 5.53 mm deep, which are designed to prevent bending (breakage) of the valves in the event of a broken timing belt.

Previously, if this happened, the connection between the valves and the crankshaft was lost, their movement stopped, but the shaft itself, 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 is that they bend, break, or even pierce the bottom of the piston.

The dimensions of the piston rings, which can be either cast iron or steel, remain the same: 82 mm.

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

21124 engine connecting rods are interchangeable with model 2112 connecting rods.

Cylinder head

The sixteen-valve cylinder head differs from the one installed on the 2112 only in the increased surface area allocated for mounting 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. To distinguish them, the manufacturer puts stamps that are located on the neck of the shafts behind the second cam. If the last digit is 14, then the exhaust shaft, if 15, then, respectively, the intake shaft. In addition, the intake camshaft has a raw metal band next to the first cam.

Since hydraulic pushers are provided in the head, this saves the car owner from adjusting the thermal gaps between the cams and valves.

However, this convenience forces the driver to carefully monitor the cleanliness andoil quality, since the hydraulic pusher mechanism is very sensitive to foreign impurities in the lubricant, the presence of which can lead to its failure, and it cannot be repaired, only completely replaced.

The valve stems of the sixteen-valve engine are 7 mm in diameter, the eight-valve engine is 1 mm larger.

As mentioned above, the camshafts rotate thanks to a belt drive coming from the crankshaft. Marks for the correct setting of the operating phases of the engine on the pulleys 21124 are offset by two degrees relative to the same marks applied to the pulleys of the power unit 2112.

The gear pulleys of the intake and exhaust shafts are different from each other and are marked with their markings: intake - "21124-1006019", exhaust - "21124-100606020". In addition, the intake pulley has a circle near the hub and a shutter on the inside, the exhaust pulley does not have such a shutter.

Intake-exhaust system

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

As an exhaust element, the engine designers used a catalytic converter - a unit that was not previously used in VAZ models and is a converter that is one with the exhaust 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 rail, made of stainless alloy and different from the one on the VAZ-2112, primarily in thatThere is no drain line in the fuel system. The required pressure of gasoline in the line is maintained by means of a special valve installed in the fuel pump.

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

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

Engine operating temperature 21124

Many car owners of VAZ models of 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. Engine temperature fluctuations between 87 and 103 degrees are now considered normal.

In conclusion, it should be mentioned that engine oil 21124 must correspond to a viscosity of 5w30, 5w40, 10w-40 or 15w-40. The dry motor contains 3.5 liters of lubricant, however, after draining, about 800 grams remain in the crankcase, respectively, when the replacement is repeated, the volume to be filled will decrease.