Each of us is trying in every possible way to improve his car, and there are a great many ways to do this. When it comes to the engine, everyone unanimously talks about increasing its power. Although, if you take the issue more seriously, then first you need to pay attention to its torque.
We know that it is possible to squeeze out the most power at a stable maximum speed, but this engine mode is rarely used. For an ordinary driver, the throttle response of a car is more important, which obediently responds to the gas pedal both in the driving mode from a standstill and during its acceleration. This behavior of the machine is ensured by a large and relatively constant torque at low and medium speeds, which is what VAZ engines “sin” with. At low crankshaft speeds, they do not have sufficient "traction".
VAZ car owners often complain about the jerking of the car at the beginning of the movement, noticeable dips when the gas is pressed sharply, the clutch quickly “flies” for many, and almost everyone notes the inefficiency of the fifth gear. Indeed, at engine speeds less than 3000 rpm. there is a lack of acceptance. The torque curve depends on the timing parameters, the so-called "camshaft phases", as well as the "time-section" of the valve opening, which are set by the profile of the camshaft cams. Depending on its angle of rotation, a different valve opening value is obtained. For better functioning of the car at low speeds, they achieve a quick supply of the required volume of the working mixture to the cylinder, that is, they significantly narrow the opening phase of the intake valve.
Unlike conventional camshafts, sport models use cams with different geometric dimensions. Their taller and wider shape causes the valve to rise higher and stay open longer to deliver a full mixture. The cam profile is characterized by smooth shapes, which makes the operation of the gas distribution mechanism more reliable in wide phases.
From the foregoing, it follows that the maximum engine power and its torque can have different values. And if the use of a standard camshaft implies increased torque at medium speeds, then the sporty one provides maximum return at high engine speeds. The sports camshaft for VAZ cars is installed with a split gear (), with the help of which it becomes possible to more precisely adjust and adjust the phases. With its help, the maximum power is adjusted at the required engine speed.
Using tuning camshafts, you can achieve engine operation under load without noticeable interruptions, even when the speed is reduced to the limit level. At the same time, the detonation boundary is pushed back, that is, the “knocking fingers” stop at low and medium crankshaft speeds. A noticeable reduction in fuel consumption and a decrease in exhaust emissions. As a result, the tendency of the engine to detonation decreases, which means that its resource increases.
Camshafts on VAZ engines are quite sensitive to adjusting the gaps, therefore, on tuning camshafts, the cam run-off area on the valve closing side is noticeably increased. This makes it easier to adjust the gaps and reduces their number several times. Let's trace this fact in the following example: after installing a tuning camshaft, valve clearance adjustment is required after 60,000 km of engine run. Using a conventional camshaft would require at least four adjustments. This significantly increases the life of the product and saves money and time required for each valve adjustment. Calculate for yourself: competent adjustment takes at least 3.5 hours and costs about 20 USD.
Camshaft classification
can be divided into two groups: grassroots and horseback. As the name suggests, some increase torque at low engine speeds, while others increase torque at high engine speeds. This is achieved by changing the height of the lift and the special profile of the cams, as well as certain valve opening / closing phases.
downstream camshafts
This type of product has a small lift height in the absence of a valve overlap zone. This mode prevents the mixture at low speeds from being thrown back into the intake. Of course, a low lift height causes a loss of filling at high speeds and this leads to a decrease in the maximum engine power. Therefore, they are mainly used when driving around the city.Do not forget that engine power mainly affects only the maximum speed of your car, which is not a critical indicator. For example, the following figures can be cited: a decrease in the power of the VAZ-2109 engine by 10 hp. will reduce the maximum speed by only 6 km/h.
The advantages of grassroots shafts include an increase in torque on the "bottoms". This is what will allow you to accelerate sharply from a traffic light without shifting into a lower gear. At medium speeds, these camshafts are no better than serial ones, and at high speeds they are even worse.
Riding camshafts
These products, on the contrary, have high lifts, a large valve overlap and wide phases. This mode increases the filling at the "tops", which is due to an increase in the flow area in the valve areas and due to the use of the effect of inertial boost. This leads to an increase in engine power, and the maximum torque is shifted to the high speed zone. Unfortunately, there is a noticeable dip in the "lower end", which is due to the wider phase during which the mixture is pushed back into the intake manifold at low speeds. And the better the characteristics of the riding camshaft, the stronger this effect.
Tuning and sports camshafts
Riding camshafts are further divided into tuning and sports. Their difference is mainly related to the phase characteristic, valve lift and overlap height. The higher the lift, the higher the torque and, as a rule, the power at high speeds.
practically unsuitable for use in urban driving conditions. They have a noticeable dip at low rpm and rather erratic high idle. Their maximum return occurs only in the region of almost limiting engine speeds, which is unacceptable under normal driving conditions.
One of the brightest representatives of the sports class of products can be called
Dear customers, in order to avoid errors when sending camshafts, in the "Comment" line, indicate your car model, year of manufacture,number of valves.
For driving valves VAZ 2112, 2170, 2190, 21126 (16 V ) two camshafts are used - intake and exhaust. The shafts are cast iron and have five bearing journals that rotate in sockets made in the cylinder head and in one common camshaft bearing housing. To increase wear resistance, the working surfaces of the cams and the surface under the stuffing box are bleached.
To distinguish the intake camshaft from the exhaust camshaft, a distinctive belt A is made on the intake shaft near the first support.
1 - block head; 2 – an inlet camshaft; 3 - stuffing box; 4 - final camshaft; 5 – the case of bearings of a camshaft; 6, 8 - sealing rings; 7 - guide pipe; 9 - block head cover; 10 – an arm of fastening of a plait of wires; 11 - plugs; A - a distinctive belt of the intake camshaft.
Shafts are kept from axial movements by thrust collars located on both sides of the front support. The front ends of the camshafts are sealed with self-tightening rubber seals. The rear holes located along the axis of the shafts in the cylinder head and bearing housing are closed with rubberized cap plugs.
The camshafts are driven by pulley 1 on the crankshaft with a belt drive with toothed belt. To drive two camshafts with backlash-free gas distribution mechanism, increased torque is required. Therefore, the belt width has been increased to 25.4 mm (instead of 19 mm for 2110 engines). Width increased accordingly. pulleys and rollers.
1 – a gear pulley of a cranked shaft; 2 - toothed belt; 3 – a pulley of the pump of a cooling liquid; 4 - tension roller; 5 – a pulley of a final camshaft; 6 - rear protective cover of the toothed belt; 7 - intake camshaft pulley; 8 - ring for the phase sensor; 9 - support roller;
A - TDC mark on the crankshaft toothed pulley; B - alignment mark on the cover of the oil pump; C and F - alignment marks on the rear protective cover of the toothed belt; D - alignment mark on the exhaust camshaft pulley; E - alignment mark on the intake camshaft pulley
Under the camshaft pulleys are two rollers: on the left - tension 4, and on the right - support 9. At the support roller, the mounting hole is made in the center of the inner cage, and at the tension roller it is located eccentrically (offset by 6 mm from the center). Therefore, by turning the tension roller relative to the fastening stud, you can adjust the belt tension.
The camshaft pulleys are distinguished by the fact that the disk 8 is welded to the pulley 7 of the intake camshaft for the operation of the phase sensor. Belt drive front and rear closed with plastic covers.
To set the valve timing, installation marks A, D, E are provided on the pulleys and marks B, C, F on the cover oil pump and rear cover of the camshaft drive. With correctly installed phases, label A must match label B, and labels D and E must match labels C and F.
When assembling the engine, always install a new gasket under the head of the block. The use of a used gasket is not permitted.
Before installing the gasket, it is necessary to remove oil from the mating surfaces of the block and its head. The gasket must be clean and dry. Oil contact with the gasket surface is not allowed.
The cylinder head bolts may only be reused if they have extended to a length L of no more than 95 mm. If the bolt is longer, replace it with a new one.
Before assembling the engine, pre-lubricate the threads and bolt heads by dipping them in engine oil. Then allow the excess oil to drain off after holding the bolts for at least 30 minutes.
Remove oil or coolant from the holes in the cylinder block for the head bolts.
When installing, sharp bends of the toothed belt with a radius of less than 20 mm are not allowed so as not to damage the cord.
Other articles of the product and its analogues in the catalogs: 21120100601400, 21120100601500.
VAZ 2112, VAZ 2170, VAZ 1118-1119, VAZ 2190, Kalina 2, Datsun.
Any breakdown - this is not the end of the world, but a completely solvable problem!
Causes of failure of the timing belt in a car of the VAZ family.
How to replace the timing gear pulley yourselfby car of the VAZ family(16V).
With online store Discounter AvtoAzbuka repair costs will be minimal.
Just COMPARE and BE SURE!!!
There are three important characteristics of the camshaft: the amount of valve lift, the duration of the valve opening and the camshaft timing. We will talk about them in this article. The camshaft lets the working mixture into the engine and releases exhaust gases. Camshafts differ in cam height, cam profile (it can be sharp, round or "square"), and valve opening phase. In a standard VAZ engine with 16 valves, the camshaft opens the valves by 7.6 mm at the inlet, and the same at the outlet. Valve opening phase 256 degrees. Such camshafts give a 1.5-liter engine power of 91 horsepower.
The opening phase is quite long, but the lift is designed for traction from low revs. The factory has given more attention to city driving, and the maximum power and speed of the standard car is artificially limited for the sake of slow driving and traffic jams. The 16 valve motor has a huge hidden potential for increased power, the valve lift can reach up to 14 mm, almost 2 times more than on the standard one. Increasing the camshaft lobes not only increases power, but also top speed. Why does the standard motor have a maximum speed of 5500? Engine power increases with increasing speed, because in one revolution the engine "eats" a fixed amount of the working mixture (air with fuel). Thus, if at 3000 rpm the engine produces 45 horsepower, then at 5500-6000 rpm it produces 90 l / s. There is no further increase in power. Why? The fact is that the air does not have time to pass through the valves at such a speed, and a further increase in speed leads to a drop in engine power. This is called the filling ratio of the cylinders, when the engine has a volume of 1.5 liters, and for a full cycle it is able to “suck in” 1.125 liters of air. The filling factor in this case is 75%, like a standard motor. As the rpm increases, these values decrease even more, and the engine loses power. On sports engines, the coefficient reaches 100%, or even 120% due to dynamic boost (oncoming air flow) and cylinder scavenging due to the inertia of the exhaust gases. If your car is not used to transport potatoes from the cottage, and you want to spice up its character, or even take part in drag racing, you need to expand the respiratory system of your motor. Increase valve lift and increasing the size of the valve give almost the same effect, and allow you to increase the filling of the cylinders with the working mixture. The maximum power and speed of the car increases by shifting the peak of the engine to the high-speed zone. But, the valves cannot be enlarged very much on a standard motor, as there is simply not enough room for them. Yes, there is really not enough space in our combustion chamber. Valve lift increase useful in increasing power, as it can add power without significantly affecting engine performance at low speeds. In theory, a camshaft design with short valve opening times to increase maximum power. In theory this will work. However, valve actuation mechanisms are not so simple. In this case, the high valve speeds caused by these profiles significantly reduce the reliability of the engine. When the duration of the valve opening is reduced, there is less time for the valve to move from the closed position to full lift and back again. As the duration gets even shorter, increased force valve springs will be required and it often becomes mechanically impossible to actuate the valves even at relatively low rpm. Wide phase on the camshaft of atmospheric engines is needed not only to fill the cylinders with air as much as possible, and to release exhaust gases faster. When the intake phase and exhaust phase are large enough, they overlap each other, this is called valve overlap. That is, the exhaust phase has not yet been completed, but the intake valve is already opening.
There is almost no overlap on the standard camshaft, this provides good traction at low revs. On highly accelerated motors, the overlap reaches several tens of degrees. This is necessary in order to use the inertia of the outgoing exhaust gases to fill the cylinders with a fresh mixture. The fact is that at the end of the exhaust stroke, the exhaust gases move through the exhaust pipes at the speed of sound, creating a piston effect, and the pressure in the exhaust manifold at a certain moment drops below atmospheric. At this point, you need to open the intake valve so that a fresh working mixture fills the cylinder. This effect is achieved only at high speeds, and at low speeds, valve overlap is absolutely useless, even reducing engine power. "Sport" camshafts with a long opening time have a low-speed "idle" limit (2000 rpm). Camshafts with long opening times can be made "civilized" by varying the valve opening and closing times, but the tradeoff is maximum power. For racing applications, maximum power is practically the only goal, but for "regular" cars with boosted engines, throttle response and low-end torque are very important. Camshaft for turbo engines different from the sporty naturally aspirated camshafts. On a turbo engine, the task is the same - to fill the cylinders with as much working mixture as possible, and release the exhaust gases faster. On highly boosted turbocharged engines, the lift and size of the valve must be able to pass a large amount of gases with a minimum of effort. And with phases and overlapping, things are somewhat different than on atmospheric engines. As we already know, overlapping valves on an atmospheric engine gives the effect of scavenging the cylinders, while on a turbo engine, filling occurs with the help of a boost. And if you use camshafts from a "peppy aspirated" with a wide phase, for example 316 degrees, then when the intake and exhaust valves overlap, the boost efficiency drops at low and medium speeds, and a large "turbo lag" appears. Boost starts to work only in the zone of high speeds, and the increase in power is not elastic, but peaked. Therefore, on turbo engines, camshafts with a small overlap are used, as on a standard engine, the recommended phase is 280 degrees. It is advisable to use the maximum valve lift and size possible for the cylinder head used. Camshaft phase Phase- this is the moment of opening and closing the valves relative to the position of the crankshaft (CV). What an increase or decrease in the phase affects can be understood by comparing the processes in a standard gas distribution mechanism (timing) and a timing using a tuning camshaft. In a standard timing belt, in the first stroke of the engine, the intake valve opens as soon as the piston begins its movement to BDC. When using a tuning camshaft with increased valve timing. In the first intake stroke, the piston begins its movement to the BDC, and the intake valve is still closed, and when sufficient vacuum is formed in the cylinder, the intake valve opens and the air-fuel mixture literally bursts into the combustion chamber. Since at high speeds there is inertia when filling the combustion chamber with the fuel-air mixture, in this way we increase the rate of filling the cylinder, which is very important at high speeds. Now consider the exhaust phase on a standard camshaft. Having reached the BDC, the piston begins the stroke of expelling the exhaust gases through the exhaust valve. The exhaust valve opens when the piston begins to move and closes at the end of the stroke. When using a tuning camshaft with wide phases, the process takes on a slightly different look. After ignition of the working mixture, the piston does work and moves to the BDC. At the end of its movement, the work is practically zero, and in order to speed up the release of the chamber from exhaust gases, it makes sense to start opening the intake valve. What happens when using a tuning camshaft.
Camshafts for VAZ 2112 sport engines
| 2112 - 1006014 / 15 - | M11 | M12 | M13 | |||||||||
| Valve lift, mm | 9,8 | 10,0 | 10,2 | |||||||||
| Valve opening angle, deg. | 296 | 300 | 304 | |||||||||
| Gap, mm | 0,2 | |||||||||||
| 2,7 | 2,9 | 3,1 | ||||||||||
| 2112 - 1006014 / 15 - | M21 | M22 | M23 | |||||||||
| Valve lift, mm | 10,2 | 10,4 | 10,6 | |||||||||
| Valve opening angle, deg. | 312 | 316 | 320 | |||||||||
| Gap, mm | 0,2 | |||||||||||
| Valve lift at TDC, mm | 3,4 | 3,7 | 3,9 | |||||||||
| 2112 - 1006014 / 15 - | M31 | M32 | M33 | |||||||||
| Valve lift, mm | 10,4 | 10,9 | 11,4 | |||||||||
| Valve opening angle, deg. | 300 | 310 | 320 | |||||||||
| Gap, mm | 0,2 | |||||||||||
| Valve lift at TDC, mm | 3,4 | 3,8 | 4,2 | |||||||||
| 2112 - 1006014 / 15 - | M41 | M42 | M43 | |||||||||
| Valve lift, mm | 10,9 | 11,45 | 12,0 | |||||||||
| Valve opening angle, deg. | 300 | 310 | 320 | |||||||||
| Gap, mm | 0,2 | |||||||||||
| Valve lift at TDC, mm | 3,6 | 4,0 | 4,4 | |||||||||
Note:
- The phases are given when the valve overlap point is set to TDC.
- 2112 - 1006014 - exhaust camshaft; 2112 - 1006015 - intake camshaft. Ordering designations e.g. 2112 - 14 - M11 or 2112 - 15 - M13 or for camshaft kit: 2112 - M11 / M13.
- Valve lifts are given taking into account the nominal clearance between the cam and the tappet, i.e. cam lift exceeds valve lift by the amount of clearance.
- Camshafts are completed (exhaust / intake), for example:
M11 / M12, or M12 / M13, or M11 / M13. - The valve lift at TDC is given for setting the valve timing: for the exhaust valve - on the closing side, for the intake valve - on the opening side. It is not recommended to set the overlap point later than TDC.
- Adjustable pulleys are used to set the phases.
The order of integral pushers of various designs is possible.
If you want to prepare a car for sports, then one replacement of the camshafts is not enough, but to a decisive extent, the performance of the engine depends on them. In a 16-valve engine, the possibilities for creativity are even greater. It is possible to install shafts from different series, plus turning each in any direction. Do not forget, if the overlap point is moved too much, there is a chance of bending the valves. Naturally, you need to prepare the whole car: a number of checkpoints, the main pair, wheels, engine. For each type of racing, the car is prepared individually. There is no universally prepared car. It is very important to make the right choice of camshafts. You need to know exactly what kind of car you need.
In the engine, it is advisable to increase the cubic capacity, modify the block head and install the necessary camshafts. The presented line of our sports camshafts from M11 to M43 is arranged in ascending order both in terms of characteristics and cost of improvements. The more invested in refinement, the higher the result. The maximum increase in power is provided by the installation of individual carburetors for each cylinder or 4-throttle injection, as well as a tuned direct-flow exhaust system. The company has developed options for boosting engines 2112 (1.8l): road 190 hp, drag racing 240 hp. In addition, the installation of individual carburetors allows you to achieve idle speeds of 700-900 rpm on racing shafts without any shaking.
Sports camshafts are intentionally built with a reduced base diameter to reduce head rework. Since they have a wide phase and high lift, they have a margin for contact loads at the top of the cam, which allows us to reduce the base diameter.
When participating in drag racing competitions, our team encountered traction difficulties. It clacks - it slips, at Pelenga - the pressure plate falls apart, serial 2112 - breaks the extensions on the basket, etc. We developed a basket of our own design based on 2112, increased the stiffness of the pressure spring by 2 times and strengthened the extensions. The clutch has become workable with almost any disc, withstanding torque up to 30 kg / m, even with a blow. True, it is necessary to install only the VAZ original clutch cable, the rest come off. Baskets can be made to order.
The replacement of camshafts on a 16-valve VAZ-2112 engine occurs when they are worn out and the bearing journals are worn out. Most often this happens when the overhaul of the power unit or cylinder head passes. This is a rather complicated procedure, but it is really possible to do it yourself.
In the video below, the installation of camshafts and split gears on a 16-valve engine of the VAZ family
The video material will tell you how to replace the camshafts on the VAZ-2112 16 valves, give some recommendations and advice.
Camshaft replacement process
Camshafts with gears and fasteners
In order to install camshafts on the VAZ-2112 16 valves, they must first be dismantled. Like any spare part, they are installed in the reverse order from disassembly.
So, let's look at the step-by-step process of removing and installing the intake and exhaust camshafts.
Dismantling of camshafts
Installation of camshafts
Now that everything is removed, you can proceed to install new camshafts on the car:
Choice
The camshafts of the cylinder head for the VAZ-2112 are produced only by the manufacturer, so you should not look for analogues.
Original catalog numbers: intake - 2112-1006015, exhaust - 2112-1006014. Each camshaft costs an average of about 3,000 rubles.
Intake camshaft marking Exhaust camshaft marking Nuances
When installing the bearing housing and block head, do not apply sealant that contains silicone. This is due to the fact that the motor heats up, and, accordingly, the sealant, which releases vapors that can enter the cylinders and further through the system. It is worth using a sealant that indicates in the instructions or on the packaging that it is safe for the oxygen sensor.
When applying sealant to cavities, do not apply a lot of it, because when the bolts are tightened, it can get inside and this will lead to clogging of the oil channels, and accordingly there will be no lubrication. The lack of lubricating fluid will lead to increased wear of parts that will quickly fail.
conclusions
Replacing and installing camshafts on a 16-valve VAZ-2112 is not entirely easy, but quite realistic. The main thing to ensure the result is caution and following the instructions. It is worth noting separately that the intake and exhaust camshafts are different and not interchangeable. On the inlet there is an additional border for the phase sensor.
carfrance.ru
Replacing camshafts on a VAZ 2114 with your own hands
Camshafts, like other mechanisms and components of a car, determine the quality of the engine. This material will tell you how to determine the failure of the shafts, how to replace the camshafts on the VAZ 2112 16 valves, and what needs to be prepared for this.
The pulleys of the 16-valve VAZ 2112 must be replaced when they are worn out or they are mechanically damaged. In particular, we are talking about:
- failure or spent service life of the pulley bearing journals;
- mechanical bending of the camshaft;
- spent service life, as well as badass element cams.
Lada 2112 with ICE 16 cells If during engine operation some kind of extraneous knock appears in the valves, then it is usually caused by one of these damages. In the event that you have recorded a reduced pressure of the engine fluid in the system, then this may indicate an increase in the clearances in the bearings.
To do this, in order to eliminate this malfunction, it is necessary to grind and restore the pulley bearing journals. You should also increase the grooves through which the motor fluid enters. This is done so that the lubricating fluid, after the next grinding, lubricates the internal combustion engine elements. As for the necks, after grinding them, they should be polished with GOI green paste.
- new replacement parts (exhaust and intake camshafts);
- socket wrench 8 mm;
- sealant.
Stages of work
In order to properly carry out the process of replacing exhaust elements, we suggest that you use the instructions prepared specifically for our users. Also, this manual is suitable for those who want to replace the exhaust camshaft seals, sensors or plugs.
- Open the hood of your 16 valve VAZ 2112. Remove the protective cover of the timing belt.
- After that, it is necessary to remove the cylinder head cover, as well as the emergency pressure control device (sensor) of the engine fluid. The sensor is removed so that it is not damaged during the work. You can also remove the tip of the sensor wires.
- When the sensor is removed, you need to unscrew all the screws that secure the camshaft bearing housing. This is done with a socket wrench on "8". All bolts should be unscrewed evenly, and not one at a time.
- After that, dismantle the bearing housing for the exhaust camshafts of the 16 valve VAZ 2112. It should be noted that the housing is dismantled with candle wells. They need to be pulled out of the case.
- Now as for the plugs of technological holes. During the camshaft replacement procedure, plugs are often lost from motorists. Plugs are small round pieces.
The plugs must be removed from the installation sites in the cylinder head, there are a total of two plugs, and they are located in the area of \u200b\u200bthe rear ends of the camshafts.
When these elements are dismantled, put them separately. It is better not to lose the plugs.
- After that, you can dismantle the exhaust camshaft. It is advisable to remove the exhaust camshaft first. With the exhaust camshaft removed, proceed to dismantle the intake valve element.
- Now it's up to the seals. We proceed to dismantle the seals, put them aside. By the way, when dismantling the seals, also be careful not to damage them. After removing the seals, inspect the dismantled devices. The seals should not have mechanical damage, wear marks, microcracks, etc.
- If you decide to install sports distribution pulleys on your 16-valve VAZ 2112, then you need to purchase tuned parts in advance. The installation of sports elements is common among Russian motorists. Take your sports camshafts and lubricate their cams, as well as the bearings with engine fluid.
- Please note: the exhaust and intake sports components are not interchangeable, they are labeled. For example, the numbers 1006014 are printed on the exhaust valve components.
- After that, a small layer of sealant must be applied around the perimeter of the cylinder head 16 of the valve VAZ 2112, as well as on the surface of the pulley bearing housing. More precisely, the places of application are marked in the photo. With sealant it is better not to overdo it.
- Once the sealant has been applied, the pulleys can be put back into place.
- Then install the bearing housing on the cylinder head. Tighten all screws evenly until the part body is against the cylinder head. By the way, it is also desirable to tighten the screws in a certain sequence, you can learn more about this in the video and photo.
- Then you should press in the seals, and also mount the plugs in the cylinder head 16 of the valve VAZ 2112. After that, the assembly must be done in the reverse order, do not forget about the sensor.
Video from Artem Ershov "Replacing pulleys on a VAZ 2114"
In this video you can look at the process of replacing pulleys in a 16-valve VAZ car.
AvtoZam.com
How to distinguish the intake camshaft from the exhaust VAZ-2112: photo
The camshafts of the 16-valve VAZ-2112 let in the working mixture and release the exhaust gases. Unlike an 8-valve engine, where one camshaft serves for intake and exhaust, on a 16-valve engine, each phase has its own element. This improves not only the performance of the engine, but also contributes to a lower consumption of the fuel mixture.
Photo of intake and exhaust camshafts
The intake and exhaust camshafts are marked with arrows in the photo. Pictured is the engine with the valve cover removed.
Camshaft difference
The difference between the intake and exhaust camshafts in the presence of a groove for the phase sensor
In fact, there is no difference in the design of the exhaust and intake camshafts. There is only one reason they are not interchangeable. There is a rim on the intake camshaft that is designed for the valve timing sensor.
Some motorists install sports camshafts instead of standard factory camshafts, which increase power. This is where the significant difference begins.
The intake camshaft has a larger cam size, which in turn opens the valve not by 7.6 mm, but by 13.2. This allows the engine to increase power characteristics. So the outlet itself has slightly different characteristics - the valve opens not by 7.6, but by 10.8 mm, which significantly adds power.
Sports camshaft differences
conclusions
The camshafts of the 16-valve engine on the VAZ-2112 do not differ in design features, except that an additional edge is machined on the intake shaft for the camshaft (phase) sensor. If the inlet and outlet elements are interchanged, this will lead to a disruption in the valve timing, and if the engine runs in this mode for a long time, the owner will inevitably face a major overhaul of the block head, at best.
carfrance.ru
Tightening torque of the VAZ-2112 camshaft bed 16 valves: order
Many motorists have heard that it is necessary to properly tighten the threaded connections on the 16-valve VAZ-2112 engine, but they never did it themselves. So, the tightening torque is determined by the manufacturer and is indicated in the repair service manuals.
Video about installing camshafts and split gears on a 16 valve engine
The video will tell you how to properly tighten the threaded connections on the bed of the camshafts
The moment and sequence of tightening the camshaft bed
Camshaft cover tightening sequence
Proper tightening of the camshaft bed, as well as other parts of the cylinder head, determines the normal functioning of all components and assemblies. So, in order to tighten threaded connections, a typical tightening scheme and a torque wrench are used.
Before installing the bolts in place, they must be well washed and lubricated with silicone grease.
In order to properly tighten the bolts, you need to know the sequence. It starts from the middle part and gradually goes directly to the edges. The detailed sequence can be seen in the photo below.
Tightening diagram for each camshaft bed bolt with numbering
As for the tightening force itself, it is 8.0-10.0 Nm. After the bed is installed on the block head, the connection bolts are tightened by hand or without much force using a ratchet with a head.
We tighten all the bolts by hand, but do not tighten
When all the bolts are in place, it is necessary to take a torque wrench and tighten according to the specifications in the order indicated above.
Torque wrench for tightening threaded connections
In what cases it is necessary to tighten the bed of camshafts
Bolts are screwed on. Marked with arrows
Tightening the bed of the camshafts will be needed if it was previously dismantled for restoration and repair work. So, in what cases it is necessary to remove the bed, we will consider in more detail.
