- Engine K20A: technical specifications
- Engine K20A: device
- Cylinder block and cylinder head
- Crankshaft and camshafts
- Timing chain and drive chain tensioner
- Cooling and lubrication system
- Fuel injection to the K20A engine: device and characteristic
- Air intake systems and additional air supply
- Intake and exhaust manifolds, exhaust gas system
- Oil selection
- Opinion car owners
The K20A engine is a modern four-cylinder, two-liter inline gasoline engine manufactured by Honda Motor Co. Ltd. This type of engine is installed in many modern models of Honda cars. At the moment, this engine is the most high-performance and perfect serial "heart" of the Honda brand.
Engine K20A: technical specifications
As already announced, the unit is installed in cars with front-wheel drive. The compression ratio of this engine family varies from model to model. Volume - 2.0 liters, the number of valves - 16. Power depends on the car, designed to install the engine. The "strangled" version develops 150 l. with., while the analogue for active and confident driving - 220 l. with. The maximum torque is practically unchanged and ranges from 179 Nm to 206 Nm.
The stated maximum is achieved at different speeds: from 4000 r / m to 7000 r / m. Limited by electronics 8500 r / m - the maximum speed, which is capable of running a two-liter K20A engine. Technical characteristics of this unit are considered to be the most perfect among competitors.
"Where is the K20A engine number?" - many motorists are asking this question. The fact is that finding this number is not so easy. You must have some knowledge. For example, in order to understand where the K20A engine number is, you need to pay attention to the hole in the grille, behind which is located the hood lock.
After that, using a flashlight, you should light up the part of the engine that is between the cylinder head and the radiator grille, and look through the hole in the grille at about a 45 degree angle. If, however, it was not possible to see the desired engine number, you should contact the official service center with the appropriate question.
Engine K20A: device
The engine position in relation to the car body is transverse; a four-cylinder in-line assembly is used. The cylinders are numbered so that the first one is located near the crankshaft pulley. Camshafts, by the way, there are two of them, located on top. Liquid cooling is used.
All engines of the K20A series are equipped with a system for changing the timing of the VTC and the valve lift height VTEC. VTEC, in turn, can be implemented for both shafts, and only for the intake. This parameter is the main difference between K20A engines and K20A6.
Cylinder block and cylinder head
The cylinder block is cast from aluminum alloy using GDC technology. In order to increase the rigidity of the main unit, the main bearings are closed with a bottom integral cover, which is attached to the unit with 24 bolts. For cooling in the block of cylinders special channels through which liquid for cooling flows are used. In order to lubricate the pistons, crankshaft and connecting rods, as well as to supply oil to the oil injectors, a whole system of special horizontal channels is used. The front part of the block is equipped with a vertical channel in order to be able to supply oil to the cylinder head.
The cylinder head is cast from aluminum alloy. The timing is based on two camshafts (DOHC). The camshafts are driven by a chain connected to the crankshaft. In the cylinder head is also bed for camshafts. It has rocker arms, which are part of the VTEC system. The engine uses new modern materials, which reduced the mass of the springs and the likelihood of resonant oscillations.
Crankshaft and camshafts
The crankshaft is made of steel and is a five-bearing. Subject to the use of the balance shaft assembly, eight counterweights are installed on the crankshaft. If the balancing shaft unit is missing, then only four counterbalances are used. Oil to the crankshaft is supplied using a special channel, which is held from the side of the main cylinder block. On the toe of the engine crankshaft are the gears of the camshaft drive mechanism and the oil pump drive.
Each camshaft performs its function: one of them actuates the intake valves, the other - the exhaust. Adjustment of the K20A engine valves and the clearance in their drive is made using special adjustment screws. Each camshaft has five bearing journals. In order to lubricate the cams and necks using engine oil, it first enters the rocker arm unit for the VTEC system, then into special oil channels, which are located on the camshaft in the second supporting neck. Adjusting the valve timing on the intake valves is automatic and is carried out using the VTC system.
Timing chain and drive chain tensioner
The timing mechanism in this type of engine is driven by a chain transmission. There is a special tensioner that works due to oil pressure and automatically adjusts the tension of the timing chain. To eliminate unnecessary oscillations of the chain, there are special dampeners that are mounted on the top and on the side. In order to reduce the amount of noise during operation of the timing chain, a reduction in the drive chain pitch has been implemented.
Cooling and lubrication system
The K20A engine is equipped with a closed-type liquid cooling system. Cooling fluid circulation is forced. The belt, which serves to actuate the mounted units, also drives the cooling fluid pump. A thermostat with an overflow valve designed to maintain the optimum temperature of the cooling system is located in the coolant inlet. This device determines which circle, small or large, to let the liquid to cool through the radiator.
The oil used to lubricate the engine undergoes full-flow cleaning and is supplied under pressure to the main moving parts and engine components. Used trochoid type oil pump. Inside this pump there are two rotors - the master and the slave; their engagement is internal. And they rotate in one direction. The pump is driven by a chain from the crankshaft. The oil filter is at the bottom in a horizontal position. The oil cooler, located between the oil filter and the cylinder block, serves to reduce the temperature of the oil that is supplied to the engine lubrication system.
Fuel injection to the K20A engine: device and characteristic
The fuel injection system used in this engine is the PGM - FI system (or PGI - Programmed Fuel Injection), which allows for consistent multipoint injection.
The installed fuel pressure regulator makes it possible to control the pressure under which with the help of a pump the fuel is supplied through a special filter to all the injectors. In order to simplify the fuel system, save space and increase the reliability of the fuel injection system and its operation, fine and coarse fuel filters, a sensor for indicating the fuel level, and a fuel pressure regulator are located in the fuel pump housing.
Based on the readings of various sensors, the control unit regulates the amount of mixture that is needed for injection, the composition of the mixture and the ignition timing. In accordance with the indications of the oxygen sensor and the mixture composition sensor, which is installed in front of the catalyst in the exhaust system, the control unit can set different air-fuel mixture compositions. In addition, it calculates the amount of fuel supplied to the K20A engine per cycle of operation, and does this in the following sequence:
- A decision is made as to whether fuel should be injected.
- The definition of the mode in which the car is moving begins. For this mode, the position is calculated in which the accelerator pedal is located. It also determines the speed of the vehicle and the frequency with which the crankshaft rotates by reading the sensor signals.
- A preliminary calculation of the amount of fuel injected begins, based on the frequency with which the crankshaft rotates and on the readings given by the absolute air pressure sensor in the intake manifold. At the same time, the best fuel economy parameters are achieved when driving in different modes.
- The control unit re-reads the signals supplied by the sensors: throttle valve positions, intake air temperature, coolant temperature, atmospheric pressure device, oxygen level, mixture composition, battery voltage, electropneumatic valve opening in the recirculation system. Based on these readings, amendments are made to the calculated amount of fuel.
- The concluding action - the control system gives a signal about how much fuel must be supplied to the system.
In order to improve efficiency, to ensure complete combustion of the fuel and for its better dispersion, special nozzles are used, which have 8–9 holes each.
The control unit reads information from the camshaft and crankshaft position sensors in order to determine which of the cylinders needs to be fed at the moment, as well as the injection timing.
The control unit is equipped with a function of protection against excessive overload. This allows you to automatically stop fuel injection in the event that the crankshaft rotates at a frequency that exceeds the maximum permissible. As a result of such manipulations, the engine speed drops.
It is worth noting the diagnostic system, which is equipped with a K20A engine. Characteristics and work process consists of the following items:
- The electronic control unit (ECU) is equipped with a built-in self-diagnostic system, which continuously monitors the state of the engine according to signals from various sensors. In the event of a malfunction, the system identifies it and notifies the driver by activating the Check Engine indicator on the instrument panel. When this happens, the corresponding diagnostic code of the ISO 15031-6 standard and the manufacturer's codes are recorded directly in the computer memory.
- In order to read diagnostic codes, you need to connect a special scanner to the DLC connector. There is the ability to delete codes and read Freeze Frame data using a scanner. The connector for diagnostics is made according to the SAE standard, and conclusion No. 7 is made in accordance with the international ISO standard. This conclusion has the support of information exchange on K-LINE.
- When recording most of the codes, an algorithm consisting of two stages is applied. It is used in such a way that when a malfunction is first manifested, its code is temporarily recorded in the computer memory. If this fault appears again at the next operating cycle, then the Check Engine indicator will work in this case. Driving test number 2 is carried out in the same way and with the same driving mode, but the prerequisite is that between cycles it is required to turn off the ignition.
- If any malfunction occurs, the conditions under which it arose are recorded in the computer memory (Freeze Frame).
Air intake systems and additional air supply
The intake manifold mounted on the K20A engine is located at the front, between the radiator and the cylinder head. Exhaust - on the contrary, behind, near the location of the partition of the engine compartment.
Additional air is supplied to the injectors using a separate system. The fuel injected into the engine goes through a stage of mixing with the supplied air, which helps the fuel to evaporate better and prepare a more efficient fuel-air mixture. With this, a more uniform combustion process can be achieved, even if the mixture is lean. The result of these actions is to reduce the amount of hydrocarbons in the exhaust gases and facilitate the start of a cold engine. In the cooling system pipe has a special valve that regulates the air supply. The level of its opening is regulated depending on the change in the volume of paraffin, which, in turn, depends on the temperature of the liquid used for cooling.
Intake and exhaust manifolds, exhaust gas system
The intake manifold is made of aluminum alloy and can be equipped with a geometry change system. The exhaust manifold is made of steel, which serves to reduce its weight.
In sports versions of cars "Honda" there is a special valve installed inside the muffler. It is used to reduce the inverse resistance when the exhaust gases are released. The valve is opened by pressure, which occurs at high rates of rotation of the crankshaft. In this case, the exhaust gases leave the muffler without any resistance.
Probably every car owner is interested in the issue of changing the oil. What oil to fill? Engine K20A most favorably "responds" to the native lubricant.
Since the engines of the K family are high-speed, it is worth noting that the range of oils suitable for use is minimized. Generally, like any manufacturer, Honda recommends pouring in its own oil. The characteristics of the oil poured in depend on the range of temperatures at which the vehicle is operated. But if it is not possible to fill the factory oil, then some car owners recommend the products of Mitasu or Zeppro Idemitsu as a good alternative.
If suddenly there was a knock on the K20A engine tray, there is no reason to hesitate to contact the service center or the nearest competent service station. Most often the problem lies directly in the wrong choice of oil, as well as in inappropriate engine operating conditions.
Opinion car owners
Due to the fact that Honda engines are famous for their reliability and high performance, the cars themselves have gained immense popularity among different age categories and segments of the population all over the world.
If the user needs a compact minivan, then you can buy a Honda Stream. Engine K20A, reviews of which are the most positive, just is the "heart" of this car. Dynamic characteristics and driving characteristics of the car of this brand made it one of the most popular family cars around the world. It is perfect for family trips to a picnic, to visit and on any long trip.
Another great car for a family with increased capacity uses the same engine - Honda Stepvagon. K20A allows even such a large and heavy minivan to steadily stand on the road and give odds to opponents.
If a car enthusiast is a young and ambitious person, or simply prefers speed and drive to boring driving, then Honda Integra or Honda Civic with the well-known designation Type R is easy for him. These cars are famous for their reliability, increased body rigidity and optimum stability. The increased level of dynamics is due to the installation of a 220-strong K20A.
The same powerful and reliable engine is used in the car, designed for comfortable movement over long distances - "Honda Accord" with a sporty character and the signature Euro-R. In this configuration, the car can accelerate to the cherished "hundred" in less than eight seconds!
In addition, it is worth noting that the engine "Honda" K20A - this is a great opportunity to increase the potential of almost any front-wheel drive car. Currently, it is a favorite tool for installation in VAZ cars of the tenth family. Most often, the owner of a domestic vehicle buys the contract engine K20A and installs it, changing the mounting system and adapting it to the technical needs of his car.