CFNA (engine): characteristics, features, problems

Cars of German manufacture are famous for their reliability, high-quality assembly, durability. They gained popularity all over the world due to impressive technical characteristics, in the formation of which the special place is occupied by power plants, among which the CFNA, a 1.6 liter engine, is quite modern and in demand to this day.

Production

CNFA is a four-cylinder in-line petrol engine with 16 valves, a distributed fuel injection system. One of the features of the model is the chain- gas distribution mechanism DOHC - in the cylinder head there are now two camshafts.

Currently, two main modifications of this plant are available on the market - capacities of 105 and 85 hp, as well as belt drive timing. Until 2015, all engines were exclusively German-made, but now in the domestic market there are models and with units assembled at the Kaluga plant. Their main difference from the "Germans" - belt drive timing.

Specifications

Up to 190 km / h allows the German CFNA - engine to accelerate. Characteristics for the most common variant capacity of 105 hp With a mechanical gearbox in this case can not be called impressive:

• Working volume - 1598 cm ³ ;
• Torque - 153 N * m at 3800 rpm;
• Acceleration to 100 km / h - 10.5;
• Power - 105 hp Or 77 kW at 5600 rpm;
• Grade of recommended fuel - AI95.

Not happy and fuel consumption. When driving through the city you have to fill 8.7 liters per 100 km, along the road - 5.1, in a mixed cycle - 6.4 liters. Moreover, when choosing automatic transmission, the fuel consumption increases by more than half a liter.

Its characteristics are not impressive modification, which has CFNA (engine) - CNFB capacity of 85 horsepower. When driving with a manual transmission, they will be:

• The maximum power is 85 hp or 63 kW at 5200 rpm;
• The maximum twisting moment - 145 N * m at 3750 rpm;
• The maximum speed is 179 km / h;
• Acceleration to 100 km / h - 11.9 seconds.

Only models with manual transmission are available for purchase. The fuel consumption of this combination is similar to the 105 strong unit. But the differences of engines are also evident in their design. First, a more powerful installation has a continuously variable system for changing the timing of the gas distribution on the intake shaft. The peculiarity of the unit is 85 liters. from. Is the possibility of using the 92nd gasoline without any consequences.

Engine design

Volkswagen did not plan to introduce completely new elements in the development of the unit - the engine turned out to be quite ordinary, but some novelties are still present.

The main features of the CFNA engine are manifested in the gas distribution mechanism - for easy maintenance all elements are protected with plastic covers, and important mechanisms are highlighted in bright colors.

But the main thing in the engine is the block of cylinders. It is made of light alloy aluminum, which simultaneously reduced the weight of the structure and increased its heat transfer. On the cylinder block, special channels of the main oil line, its flanges and tides are cut out.

The liners differ in thin walls, made of cast iron. The main bearings are assembled. The head of the block of cylinders represents a monolithic design from aluminum.

Lubrication and fuel injection systems

Particular attention should be paid to the lubrication system of the main units - it is a combined type. The most loaded mechanisms are processed under high pressure, and the other elements in two ways - directed and chaotic spraying of oil flowing from the gaps between the elements. In the CFNA 1.6 engine lubrication is pumped by the pump in the crankcase - it is driven by a crankshaft. It contains a replaceable full-flow filter made of porous paper.

The main task of the distributed fuel injection system is a balanced supply of the mixture during the entire operation of the motor. The fulfillment of this task is possible due to the harmonious operation of the injectors and throttle assembly. The first are responsible for the formation of the fuel-air mixture, the second - for the precise dosing of air entering the cylinder block. When the throttle valve is opened, the sucked air masses are tightened and the metered fuel mixture.

Due to this scheme of functioning, a balanced amount of fuel mixture is delivered to the CFNA engine at every moment of its operation. This, in turn, allows you to reduce energy consumption, the amount of toxic emissions and get the maximum possible power. Controls the fuel supply system of the computer together with the controller.

Features of the service

The manufacturer guarantees normal operation of the engine for 200 thousand km with timely and quality service. Routine work should be carried out once every 15 thousand km while operating cars under normal conditions, and twice as often in heavy vehicles.

At the first maintenance it will be necessary to replace the engine oil. It is recommended to fill in the lubricating fluid 5W40 with the approval of the VW-Norm 502 - it will not only provide the VW CFNA engine with normal operation, but will also increase its service life and reduce the amount of fuel consumed. At the same time, replace the oil filter.

It is not necessary to completely change the cooling system fluid. It is only necessary to check its quantity every 15 thousand km and, if necessary, fill the level. Air and fuel filters are changed twice less often, but if you drive in conditions of heavy dust, the first element should be replaced every 7,5 thousand miles.

In all other respects, one should adhere to the usual maintenance requirements - regularly check the drive belts, conductive hoses and lines, and the CFNA engine will not force itself to be repaired.

Features of work

The presented engine of serious problems during operation does not cause. If you bought a car from the factory, the first 1-1,5 thousand km carefully monitor the level of engine oil - during the run-in it was observed its increased consumption, but below the critical value the amount of lubrication never decreased.

When driving in a strong heat with a devastated tank of drivers, you can be disturbed by the loud buzz of the gasoline pump. For the time being, this problem can be remedied by replacing the filter element of the fuel supply system. Very often, a buzzing sound disturbs, especially when the driver's side door is open - this is how the same pump works, and it will not be possible to reduce the level of noise produced.

A common problem

Each owner of cars with the presented engine faced one problem - knocking, tuffling, diesel sound during operation. The reasons for the increased noise level are in the special form of the pistons, as well as in the "clamping" of the exhaust manifold. The solution to the problem is possible in two ways:

1. Installation of modified pistons with ET marking - this option is preferable for machines whose warranty is not yet over, because the work is obliged to carry out a service center.
2. Replacing pistons and exhaust manifold with a 4-2-1 bezkatovy with simultaneous reprogramming of the control unit - this way will not only get rid of noise, but also increase the capacity of the unit, but it will have to be carried out independently.

To carry out such work will have to the owners of VW POLO - the prerogative of these cars is this engine. And to carry out repair procedures it will be necessary periodically - after an indefinite period of time the knock will appear again - this is the design of the motor. But the knock violates only the acoustic idyll, and does not affect the resource in any way and does not signal typical faults.

note

Serious trouble can be called knocking under the hood while driving on a rough road. If the suspension of the car, the steering rack is OK, the left engine cushion is faulty. It often fails to withstand stress and requires replacement.

To extend the service life, fill only high-quality fuel with an octane rating of at least 95 in the CFNA engine - the problems of unstable work, jerks and jerks will then bypass you. In cases of difficult start in a severe frost, inspect the starter.

A common problem is the appearance of cracks in the standard exhaust manifold. Detect defects if you pay attention to the change in the sound of the engine. Fault rectification by installing a more modern "spider" 4-1 or 4-2-1 with simultaneous reinstallation of the computer software.

The budget solution to this problem can be argon-arc welding. But you can apply this only after the warranty expires, otherwise you will lose the right to service.

Tuning the unit

The CNFA engine has some power reserve, which guarantees stable operation for a long period. But you can use the reserve to increase power. Having done simple operations, the amount of horsepower can be increased from 105 to 130. To do this, you need:

1. Buy and install an exhaustless bevel collector 4-1 or 4-2-1.
2. Manufacture or purchase a cold air intake system.
3. Reprogram the electronic control unit.

Such manipulations are usually carried out by the owners of VW POLO. Other additional operations do not make sense, because the cost of all the work will be higher than the price for a more powerful and modern engine.

Recommendations

To extend the life of the power plant, refuel only on trusted bus stations. The difference in the quality of German and domestic fuel seriously affects the resource.

It's all about the graphite spraying of the piston group - it quickly wears out when using second-rate fuel, which leads to the appearance of scuffing. In any case, do not allow the installation to overheat. This greatly affects the consumption of oil, the lack of which instantly leads to the "boiling" of connecting rods.

For these reasons, drivers are advised to follow mainly the quality of the fuel used and the level of engine oil. The CFNA engine reviews are mostly positive. Choose a car with such a powerplant follows those who are looking for a budget solution for a calm and measured ride.