05 February 2016 Lada.Online 76 502 10
How to quickly and accurately determine the condition of the engine? Check the compression in the cylinders! Is the engine running rough, you feel a loss of power, the consumption of engine oil or fuel has increased and the car has become difficult to start in cold weather? All of these problems may be caused by low compression in one or more cylinders.
To ensure that the compression test gives accurate results
Compression depends not only on the technical condition of the engine, but also on the conditions under which it is measured. Make sure that during the check:
- the compression gauge was working properly;
- the engine has been warmed up to operating temperature (up to 90 degrees);
- the throttle valve was fully open;
- spark plugs in all cylinders must be turned out;
- the starter was fully operational;
- the battery was fully charged;
- The engine air filter was clean.
Motor 126 and 127: working life, differences
These engines on Priora had a displacement of 1.6 liters (or 1596 cm3). Optimal for city sedans, the engine size of the Lada Priora gave a good combination of dynamics and consumption: along with very decent acceleration, fuel consumption does not exceed sky-high numbers. Both engines received good marks, because the car behaved perfectly in the city and on the highway.
In fact, the 126 Priora engine became the first sixteen-valve engine for this model, and the 127 is a modified version, “overclocked” by AvtoVAZ designers. In addition to the same engine displacement, they have other identical characteristics. The in-line type of arrangement of four cylinders provides a simplified design that can be repaired on your own.
The distributed multipoint injection system is involved in creating a good, rich fuel-air mixture (a lean mixture can lead to breakdowns). The cylinder diameter is 82 mm, the piston stroke is 75.6 mm, the compression ratio is 11. The “engines” fall under the Euro 4 standard, they are powered by gasoline with an octane rating of 95.
The 126 engine for the Priora received the following characteristics: 98 hp. (72 kW at 5600 rpm), acceleration to 100 km/h in 11.5 seconds (with manual transmission), city consumption 9.1 l - 100 km (manual transmission), maximum torque - 145 Nm.
The 127 engine for the Priora was upgraded to the following figures: 106 hp. (78 kW at 5800 rpm), acceleration to 100 km/h in 11.5 seconds (with manual transmission), city consumption 8.9 liters per 100 km (with manual transmission), maximum torque – 148 Nm.
The difference may not seem so noticeable, but this is a very small but strong step in design on the part of AvtoVAZ (this is where the change to sixteen-valve “engines” with a volume of 1.6 liters ended). For a car of the Lada Priora class, the engine power was sufficient.
In the same block it is necessary to say about the operating temperature. An absolutely normal operating temperature is considered to be between 90 and 95 degrees Celsius. Further, when the car is being pushed in a traffic jam, is basking in the sun, or for some other reason, but can still work - from 97 to 110 degrees. The engine is slow in places and wears out a lot, but you can still get to your destination. A temperature below 90 degrees is a direct sign indicating that the car has not yet warmed up, and it is better to wait in place until the arrow points to the coveted 80-90 mark.
Operating a car at temperatures above 110 degrees is dangerous because the service life of the engine is noticeably reduced - hot parts undergo very severe wear, overcoming the force of friction.
In general, the service life of the Lada Priora engine with a normal driving style and careful treatment is 200,000 km - after this mark the time comes when the “engine” requires major repairs. AvtoVAZ mentioned the timing belt separately as a recommendation, saying that it needs to be checked every 100,000 km (many car enthusiasts talk about the figure of 50,000 km).
All Lada engines have a problem, and it is related to the valves, which will be discussed further.
What are the cylinder compression standards for VAZ engines?
Engine specifications must indicate “minimum cylinder compression values.” If you cannot find such data, determine the compression standards yourself using the formula:
| Compression (kgf/cm2) = compression ratio (see technical specifications of internal combustion engine) * coefficient (for VAZ min 1.2, max 1.3) |
A few examples:
- The compression ratio of modern VAZ 21126 and VAZ 21127 engines installed on Granta, Kalina and Priora is 11. We multiply the values using the formula and get the compression standards: 13,2..14,3.
- For the Vesta engine (VAZ-21129) the compression ratio is 10.45, the compression standards will be: 12,5..13,6.
- For Niva (VAZ 21213, 21314) - 11,3..12,2.
If the compression gauge values in all cylinders are within the normal range, this does not mean that everything is fine. Different compression in the cylinders is also bad. It is important that the difference between all readings is minimal. Compare the minimum and maximum compression values in the cylinders. According to technical standards, the difference should be no more than 1 kgf/cm2 or 10% .
see also
Comments 29
I bought a viburnum with a 126 engine not so long ago, compression 9.6,14,12,14, mileage 127 thousand, I pour 150-200 grams of oil every week, and the question is, is the problem in the valves or does the engine need to be completely rebuilt?
If the compression differs by more than 1, it means there is a problem with the piston. Maybe the rings are stuck, maybe something else
good compression, don’t listen to anyone) I have one myself and the mileage is 100 thousand) when the rings are stuck, it will be visible to the naked eye from the exhaust fog will go around)
13 is very good for a 126 engine, the compression ratio from the factory is 11! Increased compression with in your case, you need to figure out the cause, fortunately there are few of them! Find a normal motor mechanic.
In 126 engines this is normal. On my Priora the same thing happened even after 92 thousand. mileage I was interested in the mechanics, they said this compression is due to the lightweight piston. And oil consumption in these engines seems to be the norm, although some write, from replacement to replacement. An acquaintance took a new one from the dealership, after the first replacement it began to eat up, and someone drills additional holes in the piston, in the oil scraper groove when replacing the caps. They say it helps.
There shouldn’t be any oil-guzzling at all! There is no need to drill short pistons, because... They are already designed correctly!
Compression is quite good, the only question is that the oil scraper rings could have worn out, due to a good film of oil, that’s why the compression is so good...
13.8 in each cylinder was
Meryl the other day. 16 and further the pressure gauge needle goes off the scale
