Pistonless pistons on "Prioru": device and characteristics

Owners of cars "Lada Priora" often get into unpleasant situations. Breakage of a belt of a gas-distributing mechanism leads to sad consequences. The thing is that the pistons, which the manufacturer installs at the factory when assembling the engine, have samples of insufficient depth. These selections are called cogs by the mechanics. This is the cause of the destruction. Repair of the engine after such an incident will cost the car owner dearly. It is cheaper to replace regular ones with so-called bezvtykovye pistons on "Prioru".

Physics of work of pistons, loads

This element is designed to convert energy from fuel explosion into translational motion and transfer them to the crankshaft. When the gases expand after the explosion, the piston and its working surface are subjected to mechanical and thermal effects. The item experiences high-intensity loads. The maximum possible pressure in the engine "Priora" can reach 65-80 bar. This is almost several tons. During operation, the pistons can periodically accelerate their movements to 100 km / h or more. Also their movement can slow down almost to zero at a frequency of up to 200 Hz at 6000 rpm. When a mixture of fuel and air explodes in the cylinder, the temperature inside can reach 1800-2600 degrees. Under such temperature effects, the strength characteristics are reduced. There are thermal stresses due to sudden temperature changes. It is also worth adding voltage from the pressure of the combustion products and inertia during acceleration and deceleration at high frequencies.

About the design of standard pistons

In order to work in such conditions, the detail should be as light as possible. And the material is resistant to wear. Also, the alloy should have a high thermal conductivity. This will ensure a high cooling rate. The outer working surfaces must be made in such a way that the part does not get stuck in the heated cylinder. Also, the combustion products must not penetrate into the crankcase. The piston has a barrel-like shape, there is a big difference between the degree of heating of its working part and the skirt. This allows you to meet all the requirements. To compensate for possible deformation of the skirt during operation, the piston is manufactured with an "anti-ellipse". The major axis of the part is strictly perpendicular to the axis of the finger-mounting hole.

The piston head or its upper part includes a bottom. There are also special grooves for the installation of O-rings. For the upper part to cope with high loads, at the production stage it is covered with a special layer of protective coating. Grooves for installing rings are made so that there is a small angle. This ensures that the outer edge of the ring is positioned higher than the inner one. This makes it possible to prevent the slope of the groove cross-section downward during operation at high temperature loads. To ensure a better slip, the piston is treated on the entire working surface with special coatings. In order for the part to be worked better, such coatings are applied which will wear out during the running-in process. This is a tin coating or phosphating. Materials that improve the sliding, remain on the surface for the entire life. The skirt is processed with the help of cutters. This is done to obtain a microrelief. Due to this, the oil is better retained on the surface of the part, thereby reducing friction.

Differences in the design of "safe" pistons for the "Priora"

So, bezvtykovye pistons on the "Prior" from the regular almost do not differ. This is actually an exact copy of the standard piston for engines from AvtoVAZ. But on the top of the traditional mirror there is - instead of it there are deep samples. This makes it possible to secure the timing parts and the pistons themselves when meeting the valves. The dimensions and all other parameters fully correspond to the characteristics of the standard parts.

Why install non-water pistons?

On each car it is individual. If you fully comply with the manufacturer's engine maintenance regulations, install recommended or at least qualitative spare parts and consumables, then the car will serve for a long time and properly, and all mechanisms and units will operate in their normal modes.

But everyone wants to save money or make a car tuning, and here there are a number of questions. If you save at the expense of the timing (and this belt and rollers to it), buying deliberately substandard details, it should be borne in mind that the replacement intervals for them will also fall, as well as the price. For example, if it is standard on Avtovaz engines, the belt should be changed after 30-50 thousand km, then on cheap and unoriginal components, rarely more than 5-10 thousand km could be driven. Some tuning specialists try to take everything from the engine and even more than what it can give. Often the motors are equipped with compressors. However, most of the parts and components in the engine are not designed for such loads. The engine can not operate for a long time in the range of 7-9 thousand revolutions. Not designed for this operation and timing mechanism - the weakest link is always damaged. And this is the belt. And what to do when you want to save money and still not go slow? It is possible to get out of this situation by installing the bezvtykovye pistons on the "Prior".

The advantages of installing secure mechanisms

Even inexperienced motorists know that the system with bezvtykovyh pistons will be more protected and hardy. Even if the belt breaks, the upper camshaft simply stops. The piston moves from below due to the action of the crankshaft. If there are no-piston pistons installed on Prioru, there will be no catastrophe. Valves will enter the grooves and do not bend. Even if the belt is torn, the car can be transported to the service station. This is a great advantage.

disadvantages

In the process of creating various "AvtoVAZ" engines for front-wheel drive models, designers and engineers initially created similar pistons. "Priora" non-sticky grooves had already from the factory (in the early versions). More often they can be found on VAZ engines of the tenth family. This was due to the use of a belt instead of a chain. If the piston is eased as much as possible, the motor acquires an additional 5-7 percent of capacity, this is a lot. The replacement of the pistons on the "Priora" by the non-stick capacity will not add. This will only protect against expensive repairs. To make a groove, it is necessary that the surface is thick enough. The piston is made heavy, which takes the power. The duct also has an unsatisfactory effect on the compression of the combustible mixture. This also affects the power. As a result, if you install such details on the car, the motor loses 5-7% of the force. For the engine of 150 liters. from. This is 10.5 liters. S, which is very important. That's what those who have already installed a non-stick piston have already installed on their "Priora" car. Reviews show that, in addition to reducing power, fuel consumption has increased. Increased detonation due to uneven weight distribution.

Piston producers for "Priora"

So, the car owner decided to protect himself and thinks about installing protected pistons. Let's take a look at what is available on the market for non-stick pistons on Prioru, which are better to buy and install.

STI, Togliatti

These products are manufactured in Togliatti using hot pressing technology. Judging by the reviews of those who have already equipped them with an engine, the details significantly reduce the efficiency and engine power. This can be explained by the low compression ratio and the large cylinder size. Samples for the valves are too deep. The low silicon content of the alloy does not influence the strength characteristics in the best way. Less nickel content reduces the resource. At the same time, forged pistons from STI have a high cost.

STC

Pistons "Priora" untypical STK produce in Samara. The characteristics of these products are practically no different from regular pistons. The samples are rather deep. Owners may not worry about the consequences of belt breakage timing. Of the disadvantages can be identified a higher mass. This affects the dynamics of overclocking. But adequate cost is the decisive factor when choosing.

Conclusion

Thus, it is seen that safe pistons have a lot of advantages. These advantages are undeniable. Every car owner of this model should install the bezel-resistant pistons on the "Prior". Which to choose depends on the goals and objectives. If it is necessary reliably and inexpensively, then it is STK or Ukrainian "Avtramat". However, the plant in Kharkov stopped production, and all stocks are practically sold. A STE of their money is not worth it, note the reviews.