VAZ-2112 engine: design and maintenance nuances

The Lada of the tenth family in the hatchback body is the VAZ-2112 model. All cars of this family were produced until 2009. The range of engines included four options. Among them, by the way, were two 8-valve engines. Below we present the characteristics of 16-valve engines, but engines with 8 valves do not deserve attention. The torque graph proves these words true. So, let's look at the characteristics of VAZ-2112 engines with four valves per cylinder.

Two different 16-valve valves accelerate the car differently. Here is a video of the test drive.

Characteristics

Cylinder block

The 2112 cylinder block is made of high-strength cast iron, and at first glance, is similar to the 21083 block. The main differences are the diameter of the head mounting bolts and holes for them in the block reduced to 10 mm, lugs for the fuel injection system sensors and a completely different technology for honing the cylinders during production .

For the VAZ 2112 block, five size groups are defined. Size classes are designated by letters: A, B, C, D, E.

Modifications

Let's consider models of internal combustion engines. First, the basic design of the VAZ 2112 15 16v engine was created. In this model, there is free space inside the block and cylinder head, which is a disadvantage, therefore, after the release of the first model of the 21120 engine, other improved modifications began to be produced. In model 21124, the engine was increased to 89 hp. and increasing the volume of the internal combustion engine to 1.6 liters.

In model 21126, the engine design was improved, as a result of which the engine acquired a volume of 1.6 liters, and the power indicator of the design was increased to 98 hp. Model 21128 has the largest combustion chamber volume, which is 1.8 liters. At the same time, the power characteristics of the engine of this car model were increased to 105 hp.

In these modifications, major repairs are carried out less frequently, and the valves do not bend. The first modification was made to increase engine capacity and achieve world quality standards. Changes in these modifications were made by increasing the block height to 197.1 mm and increasing the piston stroke.

In the next modification, engineers created the greatest resource for various system components. For this purpose, cylinder honing was used according to the Federal Mogul method. In design 21126, the number of sets of liners and pistons is reduced to 3 pieces. In this case, the step between them is 0.01 mm. Model 21128 is produced not by the AvtoVAZ production association, but by another manufacturer, Super-Avto CJSC.

ICE performance has been improved:

• engine capacity - 1.8 l;
• power characteristics increased to 75 kW;
• torque is 162 Nm.

The cylinders have a diameter of 82.5 mm; a new crankshaft was created that provides a piston stroke of 84 mm; The width of the rings is increased to 2 mm in oil scraper models. The throttle cross-section has increased and is 51 mm.

The new model has Siemens injectors installed, which have high performance. Model 21127 was released in 2013. In it, the torque is increased to 148 Nm, the volume is increased to 1.6 liters, and the power characteristic is 106 hp.

Model 21129 has a volume of 1.8 liters. It has a phase shifter installed. Various engine configurations have been created (LI, GLI, SLI), in which additional options can be installed, such as electric windows, door locks, and an immobilizer.

• Comparison of modifications
• cylinder head

Power core

The VAZ 2112 engine was not created from scratch. Its design with a 16-valve gas distribution mechanism (GRM) repeats the model 2110, and the cylinder block (BC) is a copy of the “eight” (21083). This can be verified by comparing their geometric parameters: bore diameter and center distances.

True, the blocks are not interchangeable, since they differ in the diameter of the cylinder head (cylinder head) mounting screws. Unlike parts 21083 and 2110, the BC has additional oil channels in the main bearings to supply oil to the lubricating nozzles. Through these devices, additional lubrication of the lower part of the cylinder surfaces is carried out, as well as cooling of the piston bottoms.

Now a little about how the 120th and 124th engines differ from each other. VAZ 21120 contains BC 2112 with a height of 194.8 mm, and 21124 contains BC 11193. The height parameter of the latter is 197.1 mm (the so-called “high” block). The 124th crankshaft has a longer stroke compared to the 12th. For motor 2112, the elbow has a size of 35.5 mm (stroke 71), and for motor 21124 it has a size of 37.8 mm (stroke 75.6). As a result, the working volume of the 124th version is 1.6 liters, versus 1.5 for the 120th.

The pistons also differ from each other. Both have counterbores to ensure the exit of the valve plate. However, on the 120 engine their depth is deceptive. It is designed only for the normal functioning of the timing belt, and in the event of a toothed belt break, the “meeting” of the valves with the pistons becomes inevitable. The 124th drive has everything in order; eliminating the incident will only require replacing the belt without disassembling the power unit.

Replacing the pistons on the 21120 engine with 124s will allow you to avoid the troubles associated with a broken belt. True, the power of the VAZ 2112 engine will be somewhat less.

Design Features

A new version of the VAZ 2112 engine with increased power was created by AvtoVAZ together with specialists from Porsche and General Motors.

Motor 2112 has the following design changes:

• a separate drive has been created for the exhaust tract; the intake valves are controlled by the cams of their intake pipe camshaft;
• steel connecting rods 121 mm long were created;
• holes were made in the instrument block for attachments;
• improved: distribution mechanism, cylinder block assembly, crankshaft, lubrication system, spark plugs, torque, maximum speed of the internal combustion engine;
• special hydraulic pushers were created that saved owners from periodically adjusting the valves and choosing their number;
• improved control of the operating temperature of the fuel in the internal combustion engine;
• a floating landing of the piston is performed;
• Oil channels are created inside the cylinder head.

Front side of the engine

The front side of the engine is located near the right mudguard. It has a two-piece plastic cover.

Below it are the drives of the gas distribution mechanism and the electric generator. The timing belt includes: camshaft gears, a coolant pump and 2 rollers, one of which regulates the tension of the timing belt. At the end of the crankshaft there is a timing gear, a generator pulley and an oil pump. These components are driven by its rotation.

Malfunctions and repairs

The new generation engine, subject to operating conditions, operates for quite a long time. The basic modification was created jointly with the German company Porsche, which is considered the most advanced in the creation of engines.

A small disadvantage is the use of a toothed belt drive, which requires the installation of high-quality spare parts, which cannot always be found in car repair shops.

At the same time, some motorists do not carry out regular maintenance in a timely manner, which leads to a reduction in the service life of the device.

Malfunctions that may occur in the operation of the internal combustion engine, and methods for eliminating them:

1. Adjusts the engine. The fault lies in the cylinder head distribution unit, spark plugs or wires.
2. The engine is idling unsteadily. In this case, you need to check the crankshaft sensor, throttle plate and control device. If this does not help, then the mass air flow sensor may have failed.
3. At idle or when the vehicle is moving, the drive stalls. Such a problem may result from contamination of the throttle assembly, its sensor or IAC.
4. If the engine does not catch when starting. If the battery and starter are working properly, then the problem has occurred in the power supply or ignition system.
5. Hydraulic compensators are knocking. The breakdown consists of a decrease in oil pressure in the engine.
6. The engine warms up slowly. You should check the presence of coolant, connecting rods and thermostat operation.
7. The internal combustion engine does not pull well, operation is accompanied by vibration. In case of such a malfunction, it is necessary to diagnose the engine.
8. Oil pressure is insufficient. There can be many reasons for this phenomenon. This can happen due to untimely replacement of lubricant in the motor. Over a long period of use, the oil pump may break down.
9. If the indicator turns on, this indicates that there is no oil pressure. In this case, you need to stop to find out the reason. If necessary, call a tow truck.

Piston assembly

This part of the power unit is made of aluminum, the working skirt is longitudinally conical with an oval cross section. The pistons have four recesses for the valves, protecting them from bending. For each motor model, parts should be selected according to weight, not allowing each other to exceed more than five grams. The part is equipped with two upper compression rings and one oil scraper ring at the bottom.

The piston pins are made of steel and have a tubular cross-section. The elements are secured from falling out with a pair of retaining spring rings. They are divided into three groups based on diameter; the pin is marked on the bottom, and it must be of the same class as the piston.

Service

When servicing an internal combustion engine, you need to know the brand of fuel, what kind of oil needs to be filled, and how much oil is needed for a given design. You also need to know the service life of your car’s engine and the presence of a timing belt.

Change engine oil in 2 ways:

1. With engine flush. In this case, after draining the liquid, you need to add flushing liquid or the oil that will be filled into the engine. Then turn on the engine. It should run for 10 minutes. Then drain the oil.
2. No engine flushing. After the old oil is drained, new oil is immediately poured in.

Let's look at the procedure for changing the oil. For this you will need:

• capacity 4 l;
• key to 17;
• oil filter remover.

Place the car on the inspection hole. Remove the cap from the oil filler neck. This will make it easier for the fluid to drain out because there is no vacuum forming at the top of the engine. Then remove the oil pan plug.

Drain the oil. Do not allow hot liquid to come into contact with the skin. The draining continues for 10 minutes. When changing the oil in engine 21124 to another brand of oil, the engine must be flushed.

For this purpose, fill in the flushing liquid to the bottom mark of the dipstick. Turn on the engine. It operates at idle speed for 10 minutes. Drain the liquid.

When replacing the lubricant, the filter must also be replaced. Unscrew the oil filter head cover using a screwdriver or a puller. Before installing a new filter, fill it halfway with oil and lubricate the O-ring, which will prevent air locks.

Screw the drain plug onto the crankcase. Then they install the oil filter. After this, the volume of lubricant is monitored using a dipstick. To prevent oil overflow, it must be poured slowly and the level must be monitored. Then tighten the plug and return the dipstick to its place. Turn on the motor. When the oil pressure warning light goes out, the engine will stop. Check the oil level. If necessary, it needs to be topped up.

Piston

On pistons 2112, the wells have a depth of 3.19 mm for the inlet and 3.06 mm for the exhaust.

The piston pin is steel, hollow, floating type. The outer diameter of the piston pin is 2112–22 mm, the length of the pin is 60.5 mm. The hole for the piston pin is shifted from the center plane of the piston by 1 mm.

Tuning

Before starting tuning, you need to take into account the design features of the 2112 engine. One of the frequently used tuning options is boring the cylinders for piston 21128 by 5 mm. Chipping is not used. You can replace the throttle with 54-56 mm. The exhaust tract with a 4/2/1 “spider” is being installed. You can install STI-2, STI-3.1 or Stolnikov camshaft.

If piston chip tuning and crankshaft modification are performed, which increase the piston stroke, then the valves must be replaced together. ICE 2112 is considered the 5th generation of engines with a 4-stroke cycle. In the initial version, the design was not fully developed, as the valves bend. In later models this defect was corrected.

If you change the cylinder head and install a wide-phase camshaft, the power characteristic will be 130-140 hp. If you install a crankshaft with a long crank measuring 37.8 mm, then modification of the combustion chamber and the use of T-shaped valves will increase the power characteristics to 150 hp. Some car enthusiasts, in order to increase power, mount ICE 2112 on rear-wheel drive VAZ 2105-2107 cars. To install the engine under the hood, car owners cut off part of the partition of the internal combustion engine compartment.

Conversion of an 8-valve engine to a 16-valve engine

This alteration is carried out by modifying the bolts securing the head. To upgrade, you need to change the head. In order for each screw to fit into the hole in the head, it must be adjusted in length and diameter. The holes in the gasket also need to be modified.

Then they change the pistons, connecting rods and adjust the wires. It is necessary to take into account the difference between sixteen-valve pistons and 8-valve pistons. The placement of the sensors is also excellent. Leave the ignition system and connect the unit using high-voltage wires.

Increase in engine displacement

The working volume of the internal combustion engine depends on the piston diameter and stroke. In the factory version, the displacement is increased by installing a higher block and a crankshaft with a crank radius that will increase the piston stroke to 75.6 mm. The displacement can be increased to 1580 cm³ by installing a crankshaft with a crank radius increased by 1.9 mm, which will provide a piston stroke of 74.8 mm.

Spider exhaust manifold

To install the “spider” manifold, the exhaust system unit is dismantled: the intake pipe, the exhaust manifold of the internal combustion engine. Instead of a standard exhaust manifold, a “spider” is installed. It must fit precisely onto the cylinder block and not touch the wiring.

Installing a zero resistance filter

A zero-resistance filter is installed in the engine instead of a standard air filter. It allows you to reduce inlet resistance without reducing filtering capacity. Thus, it increases the power characteristics of the motor. Thanks to the installation of a zero filter, you will not have to change the filter device every 10,000 km. The zero filter can be washed with a special composition, this will restore its functions. After installing it, the engine torque increases.

You can do the installation yourself. First, remove the standard filter housing. Then the selected design of a zero-resistance cone filter is installed on the pipe that fits the air flow sensor. The filter brand must be selected according to the diameter of the installation site.

Other differences

The engines also differ in their “inhalation” design. The 120th intake consists of two aluminum parts: a manifold (“horn”) and a receiver, connected to each other by rubber corrugations. Unit 21124 is “decorated” by an intake system made of plastic and consisting of a single part.

The ignition system is designed differently. The VAZ 2112 is equipped with an ignition distributor module, and on the 21124, individual coils are installed for each cylinder. Due to differences in intake and ignition systems, valve covers also differ.

The 1.6-liter unit has some other differences from its brother: the pressure regulator has been moved from the fuel rail to the pump, the catalyst is located directly at the cylinder head, there are 2 oxygen sensors (Euro-3) instead of one (Euro-2) for the 1.5 liter. The split timing case design makes it easy to replace the timing belt.

People often ask: where is the serial number of the engine on the VAZ 2112? Indeed, the number located under the air filter is quite difficult to detect. It is located at the rear end of the BC, under the thermostat housing. To find the required numbers, you need to release the air filter mount and tilt it slightly to the side.

If corrosion makes it difficult to read the serial designation, you should use fine abrasive sandpaper and then wash the area with WD-40.

Supply system

The engine fuel system consisted of a fuel tank, pump, carburetor and connecting pipes on all Lada-Sputnik vehicles and was 43 liters. The carburetor of engine 21083 was produced under license from the French company Solex and was quite reliable in operation. The problems could only be caused by a stuck idle air valve.

Production of engines with this fuel system continued until the early 2000s, but increasing demands on fuel consumption and exhaust gas purity led to significant changes in the fuel system. Already in 1994, the first small-sized engines 21083 with an injector appeared. Injection engines reduced power to 70 hp. C. During the first years of production, most of these machines were exported.

The pre-injection system used Bosch or General Electric components. Then, under the designation “January”, the domestic fuel injection control system began to be used.”

Lubrication system

The engine is equipped with a mixed lubrication system: some components are lubricated by a gear pump (shaft bearings), and some are lubricated by gravity and splashing (pistons, cylinder mirrors and other components). The amount of oil in the crankcase is 3.5 liters, but all the oil has not been drained and 3–3.2 liters of oil is enough to change.

Engine oil 21083 must have high lubricating characteristics and the ability to maintain its properties for a long time at various temperatures. Initially, M6/10G or 12G mineral oil was recommended for the engine.

Currently, owners use mineral or semi-synthetic oil with a viscosity index of 5W40 or 10W40. There is a risk of leakage when using full synthetic oil. This is especially true for engines with high mileage.