The CFNA engine unit is produced at the engine plant in Chemnitz (Germany). In addition to purely German cars, they are also available for certain Skoda Fabia and Skoda Roomster models. Unfortunately, the excellent engine began to lose its brilliant reputation due to numerous complaints from POLO owners about sluggish dynamics and suspicious “diesel” knocks after a run of 70 thousand km.
Polo Sedan engine problems - reasons?
The initial inspection and analysis of the cylinder-piston group (CPG) showed the presence of contact marks on the side surface of the heads and traces of wear on the piston skirts in the swing plane of the part. In addition, on the cylinder walls, on the mirror, there are loops and marks left by the piston skirts.
According to the preliminary conclusion of experts, the reason for such a deplorable state of the CPG was the undesigned, extremely harsh combustion of the fuel mixture at a high compression ratio, reaching 10.5:1. In addition, the small area of the piston skirt led to a high contact load with a decrease in guiding properties. “hard” than expected. At the same time, there was partial washing of the oil from the cylinder surfaces with unburned gasoline, which increased friction and wear of the part.
During 2011-2012 official Volkswagen dealers carried out warranty repairs of the CPG, replacing worn pistons with new parts. This repair was able to partially solve the problem. In many cases, POLO owners contacted the service again with the same breakdown. At the same time, the breakdown occurred both in relatively “young” units with a mileage of up to 40 thousand km and in “older” products with a mileage of 100-150 thousand km.
A solution to the problem was found by German engineers in 2013, when the previous piston (EM marking) was replaced with a modernized version (ET marking) with an increased skirt ovality and a reduced piston head diameter. The redesign increased the contact area of the skirt, which contributed to its guiding characteristics. Now the piston was in the calculated position at the moment of fuel combustion, the possibility of contact of the side surface of the piston head with the cylinder mirror was eliminated.
According to VW specialists, the incident with the pistons has been resolved.
In addition to the indicated defect, a characteristic malfunction for the CFNA Engine, the formation of cracks and burnouts was observed on the exhaust manifold, which was made in one unit with the catalyst box. After additional refinement and modernization of the collector design, cracks were no longer observed. Further, no problems with the engine were observed in the Volkswagen Polo Sedan.
04.09.2018
The popular Volkswagen Polo sedan in the VAG line took a place between the tiny The Up! and mid-size Golf and Jetta. Under the hood of a small car there are engines with a volume of 1.2 to 2.0 liters. At the same time, only 1.6-liter units with a power of 85 and 105 “horses” are installed on the Volkswagen Polo (Vento) sedan.
Engine Volkswagen-Audi EA111 1.2 TSI / TFSI
The EA111 engine became the younger version of the series and, in fact, a modified version of the 1.4 TSI, but with an aluminum BC and cast iron wet liners. The piston system has become lighter, and the diameter of the pistons has narrowed to 71 m.
To emphasize the low end, the BC was covered with an 8-valve, single-shaft head. The engine uses hydraulic compensators and direct fuel injection.
The timing chain drive has a habit of stretching after 40-100 thousand kilometers.
All modifications of the Volkswagen-Audi EA111 1.2 TSI / TFSI engine are equipped with IHI 1634 turbocharged compressors with 0.6 bar maximum pressure.
In general, the engine is a simpler version of the 1.4 TSI, but with a reduced liter power.
Disadvantages include vibrations at idle and tripping, which disappear after the engine warms up.
If the engine does not run, then the reason lies in the turbocharger bypass valve and the valve that controls the turbine.
VW-Audi TSI power units like to warm up for a long time and consume more oil than normal, but this is not critical and with proper maintenance the engine can travel at least 300 thousand kilometers.
Engine Volkswagen-Audi EA111 1.4 TSI TFSI
The EA 111 family of turbocharged engines appeared in 2005 and were installed mainly in the VW Golf 5 and Jetta.
The 1.4 TSI, with any modifications, is based on a cast-iron cylinder head with an aluminum head for 16 valves and a pair of camshafts. The engine received hydraulic compensators, direct injection and an intake phase shifter.
Despite the manufacturer's instructions that the timing chain drive will last the entire life of the engine, it will have to be changed after 50-100 kilometers.
The main thing in the Volkswagen-Audi EA111 1.4 TSI TFSI engine is supercharging. Low-power versions are equipped with a TD02 turbocharger, and the most powerful 1.4 TSI Twincharger operates according to the Eaton TVS + KKK K03 turbocharger scheme, which means that the driver will not feel the turbo, but will get excellent performance.
The disadvantages of the VW-Audi EA111 1.4 TSI TFSI include chain stretching and problems with the tensioner.
Trebles and vibrations at XX cannot be avoided.
If the turbine control valve or turbocharger bypass valve is defective, the engine will not start.
Engines Volkswagen Polo Sedan 1.6
In 2010, the VW EA111 family engine with the CFNA index appeared on the Polo Sedan model and became incredibly popular among CIS motorists.
The power unit is a traditional inline four in an aluminum BC with thin cast iron liners. The block is covered with a 16-valve head with a pair of camshafts and hydraulic compensators. The CFNA unit differs from the BTS engine in the absence of an IFGR system at the intake and a different Magneti Marelli 7GV ECU.
The resource of the timing chain drive is designed for the entire service life.
The Polo Sedan engine is available in CFNA and CFNB versions. In the first case, it is a 105 hp unit, and in the second - 85 hp.
The disadvantages of the Polo Sedan engine include knocking on the CFNA version during cold start, which is caused by design features.
Knocks when driving on uneven surfaces are caused by the design features of the left airbag.
In addition, the intake manifold sometimes cracks.
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Engines |
Volkswagen-Audi EA111 1.2 TSI / TFSI |
Volkswagen-Audi EA111 1.4 TSI TFSI |
Volkswagen Polo Sedan 1.6 |
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Production |
Mlada Boleslav Plant |
Mlada Boleslav Plant |
Chemnitz engine plant |
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Engine make |
CFNA/CFNB/CWVA/CWVB |
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Years of manufacture |
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Cylinder block material |
aluminum |
aluminum |
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Supply system |
injector |
injector |
injector |
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Number of cylinders |
|||
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Valves per cylinder |
|||
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Piston stroke, mm |
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Cylinder diameter, mm |
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Compression ratio |
|||
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Engine capacity, cc |
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Engine power, hp/rpm |
86-105/4500-5000 |
122-180/5000-6200 |
85/5200 |
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Torque, Nm/rpm |
160-175/1500-3500 |
200-250/1500-4500 |
145/3750 |
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Environmental standards |
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Engine weight, kg |
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Fuel consumption, l/100 km |
5.9 |
8.2 |
8.7 |
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Oil consumption, g/1000 km |
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Engine oil |
0W-40 |
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How much oil is in the engine |
|||
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When replacing, pour, l |
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Oil change carried out, km |
15000 |
15000 |
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Engine operating temperature, degrees. |
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Engine life, thousand km |
The restless German or the engine resource of the Volkswagen Polo sedan. As you understand, today we will talk about another masterpiece of the German concern - Volkswagen Polo with its next restyling. The brand, in fact, like the model, is not new, but has a long-term positive reputation and a wide circle of fans. Europeans and residents of post-Soviet countries have long been accustomed to trust unconditionally a German product that does not need a thorough introduction.
The main indicators of the car are engine reliability and maintenance availability. We will look at how the traction element is designed and its features step by step below.
Distinctive features of CFNA engines
The service life of the Volkswagen Polo sedan engine will directly depend on timely operation, despite the fact that it is designed for 500 thousand km. mileage So, the gasoline engine is a four-cylinder unit with a power of 105 horses and a volume of 1.6 liters of the CFNA type with a 16-valve mechanism.
The camshaft system is made using DOHC technology. For convenience and quick identification of various nodes, the latter are highlighted in a separate color. All this together makes it possible to show consumption in the combined cycle of no more than 7.0 l/100 km.
CFNA technology
What is a Volkswagen engine?
- intake manifold made of fire-resistant polymer material;
- installed on the cylinder head, no interlayers or gaskets;
- the entire cylinder head complex is made of aluminum alloy;
- the ignition system is presented in the form of a contactless ignition with four coils;
- continuously variable valve timing on the intake valves;
- forced circulation of the oil pan;
- an adjustable pressure sensor is installed in the oil pump;
- electronic fuel distribution control system;
- The fastening system consists of three cushions made of durable rubber, which reliably dampen various vibrations and vibrations.
Procedure for the next maintenance
(banner_content)Manufacturer's engineers strongly recommend inspection every 15 thousand km. with mandatory computer diagnostics of all components and assemblies, as well as replacement of the following elements:
- oil filter element;
- oil pan plugs.
At 30,000 km. In addition to the previous procedures, it is necessary to supplement the regulations with the following: replacing the air filter, filling in 5W-30 lubricating fluid in the amount of 4.0 liters. In addition, pay attention that the color of the insulator can tell you a lot, for example about the composition of the combustible mixture, oil ingress, increased oxygen pressure and other points. A similar list must be carried out every 30,000 km. mileage
Reading time: 7 minutes.
Ideal mechanisms exist, perhaps, only in futuristic worlds described by science fiction writers. In their imagination, machine components never wear out and are not affected by corrosion and various substances. There is only the basic essence conveyed by the main parts of the device.
In reality, not everything is so simple. Every part of the car requires timely care. Manufacturers establish certain frameworks for replacing consumables and diagnosing the performance of the main components of the machine. Man has not yet invented the perpetuum mobile: you have to compensate for the shortcomings with constant car maintenance.
It’s not for nothing that we’re talking about perpetual motion. Although it is not in the car, it performs the same functions as its human counterpart. The “heart” not only sets the car in motion, but also emphasizes the individual character of its owner, lives the same life with him and “grows old” at the same time.
The Volkswagen Polo sedan is a unique car created by a popular German automaker. With its own and fashionable electronic gadgets adapted for the Russian winter, it conveys the harsh temperament of our climatic and road conditions.
The engines installed in new Polo sedans since 2015 deserve special attention. Both units run on gasoline and their dynamics are ideal for driving on our roads.
With proper operation, engines from Wolfsburg can serve a careful driver for a long time. But precise German technologies can also fail. Large motor overloads affect the efficiency of its components.
Common problems and solutions
Many owners of the Polo sedan are faced with extraneous noise arising from the engine. Hearing an unexpected knock in the leading organ of a car is very unpleasant. It clearly doesn't bode well. In such a situation, the main thing is to remain calm and try to independently determine the source of the noise. The saddest outcome that can happen in this case is the crankshaft liner turning. This is the end for any car: we call a tow truck and take the “pet” to a service center.
To increase the service life of the engine liner, specialists use materials that soften the friction of parts. They don't cost that much, and you can find them in any car store. If a “cushion” is already installed in the motor, then before disassembling the “engine” you should check the condition of the auxiliary element. It is possible that it is she who is knocking, and not the liner.
What to do if the nasty tapping starts to get boring? To diagnose the problem, you can go to a car service center and pay a considerable amount of money for the service. Another option that “newbies” are afraid of is to check everything on their own.
There is nothing to be afraid of here. You just need to know which nodes should be examined.
The weakest point in the Polo sedan is the valves. These elements are most often subject to physical impact. In general, the problem of valves in the engine is typical both for cars of the domestic automobile industry and for top-end foreign cars.
The functionality of the valves can be determined by the sound. An extraneous knocking noise appears at idle or medium engine speeds. This is a ringing metallic clang, which is very noticeable against the background of the operation of the power plant. Pushers have a similar sound. But their tone is a little higher. In addition, it can change while the engine is running.
When the pistons knock, you should drive carefully so as not to overload the engine. There is no point in delaying the replacement of components - a small snag can result in an expensive repair.
If a high rhythm with a characteristic metallic ringing is observed, it means the piston fingers are knocking. The sound volume increases as the speed increases and the load on the engine increases. You can get rid of the unpleasant “chord” by removing the high-voltage wire from the ignition system. With such a problem, you should immediately seek qualified help.
Connecting rod bearings have similar symptoms. Rhythmic “rattling” and average sound tonality are the main symptoms of a malfunction. The knocking also disappears if you remove the high-voltage cable from the ignition.
A decrease in the volume of the sound that occurs in indicates a breakdown in the main bearings. Again, as the speed increases and the load on the engine increases, the tone begins to increase. Simultaneously with the appearance of the “blame”, as a rule, the oil pressure decreases. In this case, the best way out of the situation is to stop the car completely and call a tow truck (or trusted friends who will help tow the sedan to the garage).
Using low-quality fuel with a low octane number can cause detonation knocks. It is not difficult to distinguish them - they have a strong metallic echo. At medium speeds the knocks can be unheard. They become noticeable when accelerating. To get rid of this kind of “trouble”, it is enough to fill the tank with more reliable, high-quality gasoline, adjust the ignition system and reduce the load on high gears. Otherwise, the combustion chambers and engine valves will need to be cleaned.
A good assistant for independently diagnosing the sound of the Polo sedan engine is an ordinary phonendoscope used in medicine.
In cold weather, knocking can occur at any time. This usually happens at 15-30 thousand km. There are rare Polo sedan models in which problems with pistons or other elements of the power plant arise at the very beginning of the run.
The main methods of combating engine knocking, which are offered by service technicians and experienced motorists:
- When starting the engine, it is necessary to increase the load on the electronic systems.
- Fuel your car only with a proven brand of fuel. 95 is optimal, 98 is even better.
- As soon as we park, we bring the speed up to 3000 and hold it for a minute. Then, without slowing down, turn off the engine.
- You need to change the engine oil in accordance with the car manufacturer's recommendations. On the Polo sedan, the best option is 9000 km.
- Warm-up should be carried out at increased speeds at around 1500.
Engine Volkswagen Polo sedan has a displacement of 1.6 liters and a power of 105 horsepower. But this year there is another one Volkswagen Polo sedan engine the same volume of 1.6 liters, but with a power of only 85 horses. This engine is installed in the new Volkswagen Polo sedan “Style” package. Today we will tell you more about these motors.
The main engine of the Polo sedan with a power of 105 hp is a 16 valve 4-cylinder gasoline engine with distributed fuel injection power 77kW. Torque is 153 Nm. The power unit is located transversely and has the factory name CFNA; it is a classic DOHC, with two camshafts on top.
The timing drive of the Polo sedan uses a chain, instead of a timing belt, as on many other engines. The timing chain mechanism is more reliable and practical than a belt. In addition, the timing belt needs to be changed every 40-50 thousand mileage, and if oil gets on it, it will fail instantly. And the chain usually lasts much longer. Detailed engine specifications We look at the Volkswagen Polo sedan below.
Engine Volkswagen Polo sedan 105 hp. 16-valves
- Working volume – 1595 cm3
- Power – 105 hp. at 5600 rpm
- Torque – 153 Nm at 3800 rpm
- Compression ratio – 10.5:1
- Cylinder diameter – 76.5 mm
- Piston stroke – 86.9 mm
- Fuel consumption in the urban cycle - 8.7 (5 manual transmission) 9.8 (6 automatic transmission) liters
- Fuel consumption in the extra-urban cycle – 5.1 (5 manual transmission) 5.4 (6 automatic transmission) liters
- Fuel consumption in the combined cycle - 6.4 (5 manual transmission) 7.0 (6 automatic transmission) liters
- Acceleration to the first hundred – 10.5 (5 manual transmission) 12.1 (6 automatic transmission) seconds
- Maximum speed – 190 (5 manual transmission) 187 (6 automatic transmission) kilometers per hour
There is still little information about the new Polo sedan engine with a capacity of 85 horses, since it appeared on this car quite recently. This engine is compatible only with a 5-speed manual transmission. Dynamic performance is noticeably worse than that of the main engine of the Volkswagen Polo sedan. But some characteristics are already known. The engine model has the factory designation CFNB; with the same 16 valves, this engine modification does not have a continuously variable valve timing system on the intake shaft. This is the main thing between the engines; this engine also has timing chain drive.
Gas distribution mechanism with overhead camshafts, power 63 kW, distributed injection. The motors themselves differ mainly only in the presence or absence of an actuator for the timing system. Hence the difference in power. By the way, you can safely use 92 gasoline; this engine is even ready for such fuel. Detailed technical specifications are below.
Engine Volkswagen Polo sedan 85 hp.
- Working volume – 1598 cm3
- Power – 85 hp at 3750 rpm
- Torque – 144 Nm at 3750 rpm
- Cylinder diameter – 76 mm
- Piston stroke – 86.9 mm
- Fuel consumption in the urban cycle – 8.7 (5 manual transmission) liters
- Fuel consumption in the extra-urban cycle – 5.1 (5 manual transmission) liters
- Fuel consumption in the combined cycle – 6.4 (5 manual transmission) liters
- Acceleration to the first hundred – 11.9 (5 manual transmission) seconds
- Maximum speed – 179 (5 manual transmission) kilometers per hour
Why does the manufacturer of the Volkswagen Polo sedan use an outdated engine, and a low-power one at that? The answer most likely lies in the financial plane; the Polo sedan's 85-horsepower engine is much cheaper to produce. In fact, the overall cost of the car may decrease, which is very important given the falling market for new cars in our country.
It is worth noting that in the fall of 2015, production of a new engine for the Polo sedan began in Kaluga. All budget sedans of the 2016 model year are equipped with more modern 1.6 liter engines with a timing belt drive with a power of 90 and 110 hp.