The differences between the VAZ 2105 and VAZ 2107 models begin with the visual design of the front part of the body and move on to the design features of the interior. The main external difference is in the hood: on the “seven” it has a characteristic stamped relief (“hump”), while on the “five” the hood is flat, without additional reinforcements. This is not just a stylistic device, but an element that affects the rigidity of the body and access to the engine during maintenance.
The second critical point is the interior and electrical equipment. VAZ 2107 was positioned as a more comfortable version, which received improved seats with headrests, a more modern instrument panel and often a more powerful engine. At the same time VAZ 2105 was created as a utilitarian replacement for the “classics”, featuring a spartan interior and simplified decoration. Understanding these nuances is important when choosing spare parts, since many body parts are interchangeable, but interior and electrical parts may not be suitable.
Historically, these cars belong to the second generation of classics, developed taking into account the requirements of the time of the late 70s. Despite the common platform, engineers made a number of changes to the body geometry and cooling system. For example, the shape of the front fenders and bumpers of the models is identical, but the attachment points and the presence of moldings differ. The key factor in choosing between these models is often the condition of the engine and the type of timing drive, which have evolved during the production process.
Body evolution and external differences
Upon a detailed inspection of the cars, the difference in the design of the front end is striking. The “Seven” received a new radiator grille with a more dense cell and chrome trim, which gave it a more “expensive” look compared to the laconic grille of the “Five”. The headlights of both models remained square, but the internal reflectors and design may differ depending on the year of manufacture and the manufacturing plant.
The back of the cars also has its own characteristics. The trunk lid of the VAZ 2107 often had a chrome trim around the place for the license plate, while the VAZ 2105 had this element painted in body color or absent. The taillights are structurally identical, but the internal wiring may differ depending on the configuration.
- 🚗 The hood of the VAZ 2107 has a relief stamping, while the hood of the VAZ 2105 is smooth.
- 🔦 The “seven” radiator grille has a more complex shape with chrome.
- 🚪 Moldings on the sides of the body were present only on top versions of the VAZ 2107.
- 🔑 Door locks and cylinders are visually similar, but the mechanisms may differ depending on the year of manufacture.
It is important to note that the geometry of doors and glass in these models is completely unified. This means that during body repairs, glass and door cards can be replaced without fear. However, the external door handles on later versions of the “Seven” could differ in shape and material from the handles on the “Five”, which remained metal longer.
Interior and cabin ergonomics
The salon is one of the main areas where the difference in car class is felt. The instrument panel of the VAZ 2105 is made of black matte rectangular plastic, which was a revolutionary solution for its time, but looked ascetic. In the “seven”, the panel received a more modern design, often with imitation of expensive material and improved readability of instruments.
The seats in the VAZ 2107 were equipped with high headrests, which significantly increased safety and comfort on long trips. In the basic configurations of the VAZ 2105 there may have been no headrests at all, or they were low and uncomfortable. The seat upholstery also varied: for the “seven”, fabric with a more complex pattern or better quality leatherette was often used.
⚠️ Attention: When purchasing a “five” interior for installation in a “seven”, make sure that the mounting slides are compatible. Although the openings are often the same, seat heights may vary, which will affect visibility.
Sound insulation in both models leaves much to be desired, but in the “seven” the plant more often used additional bitumen sheets on the floor and arches. Owners often note that in the VAZ 2107 there is less blowing from the stove thanks to an improved damper system, although the heater design remains common to all classics.
Engine Specifications
Under the hood are the most important technical differences. If versions of both cars were equipped with 1.2 and 1.3 liter engines with a timing chain drive, then the line expanded later. For the VAZ 2107, 1.5 and 1.6 liter engines were more often available, including injection versions at the end of production.
The key point is the type of timing gear drive. Chain engines (VAZ 2101, 2103, 2106) are considered more durable, but noisy and require adjustment. Belt engines (VAZ 2105, 21083 in injection versions 2104, 21067) are quieter, but a broken belt on some modifications can lead to bending of the valves. Engine VAZ 2107 in later versions it was often equipped with distributed injection, which improved efficiency.
Details about the cylinder head
The cylinder head on engines 2105 and 2107 may differ in height and location of the mounting bolts. On timing belt engines, the head often has a smaller combustion chamber to increase the compression ratio.
The food system also varied. Ozone and Solex carburetors were installed depending on the year and engine size. Injection versions, which appeared in the 2000s, radically changed the approach to maintenance, introducing electronic control of ignition and fuel supply.
Comparison table of characteristics
To visually compare the main parameters, it is most convenient to use summary data. Below is a table showing the difference in technical performance of the most common modifications.
| Parameter | VAZ 2105 (1.3 l) | VAZ 2107 (1.5 l) | VAZ 2107i (Injector) |
|---|---|---|---|
| Power, hp | 64 | 72 | 78 |
| Torque, Nm | 96 | 104 | 116 |
| Timing drive | Belt | Chain | Chain |
| Acceleration 0-100 km/h | 18.5 sec | 16.0 sec | 15.0 sec |
The table shows that even a small increase in engine volume gives a noticeable increase in dynamics. This is especially noticeable when overtaking on the highway and driving with a full load. Injection versions, despite having similar power to the carburetor 1.5, benefit from more elastic traction at low speeds.
Chassis and handling
The suspension design of the “five” and “seven” is almost identical, as it is based on the time-tested design of the classics. The front has an independent suspension on double wishbones, and the rear has a dependent beam on trailing arms. However, the shock absorber settings and spring stiffness could differ depending on the intended purpose of the model.
The steering on most copies does not have a power steering, which requires significant effort when parking. On some export or later versions of the VAZ 2107, a hydraulic booster could be found, but this is rare. The braking system is also the same: front disc brakes, rear drum brakes. Calipers and drums are interchangeable between models.
To improve handling on a classic, it is recommended to replace the standard shock absorbers with gas-oil ones and install stiffer anti-roll bars from Niva.
The car's ground clearance allows you to feel confident on bad roads, which remains one of the main advantages of this platform. However, the high center of gravity requires care when cornering at high speeds, especially when loaded.
Fuel consumption and efficiency
The issue of efficiency is acute for owners of old cars. Carburetor versions of the VAZ 2105 and 2107 consume from 8 to 10 liters of gasoline in the combined cycle, but actual consumption in the city often reaches 11-12 liters due to traffic jams and non-ideal carburetor settings. Injection modifications can reduce this figure to 8.5-9.5 liters.
Consumption is greatly influenced by the technical condition of the engine and ignition system. Faulty carburetor, clogged jets or incorrect ignition timing can increase the car's appetite by 20-30%. Driving style also plays an important role: sharp acceleration in low gears significantly increases fuel consumption.
- ⛽ The Ozone carburetor is more economical than the Solex on the highway, but the Solex is more dynamic in the city.
- 🌡️ Warming up the engine in winter increases average fuel consumption by 15-20%.
- 🛣️ Driving at a speed of 90 km/h is the most economical mode for the classic.
- 🔧 Timely replacement of candles and filters helps keep consumption normal.
It is worth considering that the consumption data is relevant for a working car. Aging of rubber seals, wear of the piston group and loss of compression inevitably lead to excessive consumption, regardless of the model.
Reliability and typical problems
Both models have earned a reputation as repairable and durable cars, but each has its own “diseases”. The VAZ 2105 often has electrical questions due to simplified wiring and the tendency of contacts to oxidize. The VAZ 2107, being more complex, can cause trouble with electronics in injection versions, where diagnostics require special equipment.
Body elements are equally susceptible to corrosion. Thresholds, arches and door bottoms are prime candidates for rust. The quality of the metal differed in different years of production, but anti-corrosion treatment was always required. Paintwork on the “seven” the quality was often better, but here too time takes its toll.
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The chassis requires regular lubrication of ball joints and checking of silent blocks. Despite the simplicity of the design, neglect of maintenance can lead to loss of controllability. In general, the “five” is considered a little easier to repair due to the lack of unnecessary options, and the “seven” is more comfortable in long-term use.
Final summary and recommendations
The choice between “five” and “seven” today is more a question of the condition of a particular instance than of the model as a whole. The differences in technical terms are not critical, and both cars provide a reliable platform for driving on poor roads. For collectors, the original appearance is important, for practitioners - the condition of the body and engine.
If maximum comfort and slightly better dynamics are important to you, you should look for a well-maintained “seven” with a 1.5 or 1.6 liter engine. If you need the simplest possible “workhorse” with a minimum of electronics and cheap repairs, then the VAZ 2105 will be the best choice. In any case, spare parts are available at any store and are inexpensive.
⚠️ Attention: When purchasing, pay attention to the engine number. On classics, it is often carelessly stamped and can be hidden under a layer of dirt or paint, which will complicate registration with the traffic police.
Both cars require careful attention and regular maintenance. With proper care, they can travel hundreds of thousands of kilometers, remaining faithful assistants in everyday activities. The main thing is not to skimp on quality spare parts when repairing critical components.
Main conclusion: The difference between the VAZ 2105 and 2107 is more of an aesthetic and comfortable nature; technically, this is one platform with minimal differences in settings.
Is it possible to install an engine from 2107 to 2105?
Yes, the engines are interchangeable within the classic line. Installing a 1.5 or 1.6 engine from a “seven” to a “five” is possible and even popular to increase power. Replacement of attachments and, possibly, modification of the exhaust system will be required.
Why is the hood on the 2105 smooth, but on the 2107 with a hump?
The hood hump on the 2107 isn't just styling, it's a structural reinforcement that allows for more powerful engines and provides rigidity when closed. On 2105 this was not necessary due to the lower power of the standard engines.
Which carburetor is better to put on a classic?
The Solex carburetor (for example, 21053 or 21083) is considered the golden mean. It provides better acceleration dynamics compared to the standard Ozone, although it requires more precise tuning and high-quality fuel.
Are there any differences in gearboxes between models?
Structurally, the gearboxes (4- and 5-speed) are identical. Differences may be in the gear ratios of the main pair, which affects traction and maximum speed. Faster pairs were often bet on sevens.