Hello Dear Subscribers and My Channel Readers! Today I want to disassemble what is in terms of choosing an engine for a car, namely what better - eight-khoplop or a sixalar (8-valve or 16-valve).
Polasering on the Internet, I found many opinions and statements in favor of each engine. Someone believes that the 8-valve engine is much more reliable than the "Sack", and someone thinks that the 8-valve engine never sink for the 16-valve. Is it so? What to choose?
We will analyze all the pros and cons of each of these engines and try to figure out what the engine is still better.
A little about the technical component
If we consider engines with 8 and 16 valves, then there are quite significant difference in them. But the whole difference is manifested only in the GBC (cylinder head). I would like to note that the 16-valve and vice versa can be noted from each 8-valve engine. Especially often it is practiced on domestic cars, depending on the wishes of the car owner.
What can I talk about the GBC, because our craftsmen and from the carburetor are reworked on the injector cars in the garage conditions;)
And now let's consider each type of engine in more detail, I will identify the pros and cons of each.
So, let's begin...
As can be seen from the picture in the 8-valve engine, only one camshaft, which controls both the intake system and the release system.
If more in detail, then each cylinder accounts for 2 valves, one opens when the fuel-air mixture is supplied to the cylinder, and the second when it is necessary to get rid of the exhaust gases after the combustion of the mixture.
The camshaft has conical protrusions that are referred to as cams. When the engine is running, the camshaft rotates, and fists in a certain order presses the valve. Thus, in each cylinder, it opens either an intake valve or graduation.
Since in engines, mainly 4 cylinders, then we obtain 4 x 2 = 8 valve engine. Of course there are cars and 6 and 8 cylinders, but also 2 valves per cylinder, but such engines are extremely rare.
Simplicity. 8-valve engines in their design are much simpler 16-valve. This simplicity (roughly speaking) is that in such an engine all parts are 2 times less, and respectively repair and zap. Parts (such as camshafts, valves, and everything connected with it) will be 2 times cheaper.
- No hydrocompensators. Another simplifying feature of the "eightylope". Accordingly, the mechanism and adjustment of the motion of the valves will also be also easier and cheaper than the 16-valve counterpart.
- "Skulling" pistons. Most of the 8-valve engines are installed "skirtless" pistons. This means that if you break the timing belt, you will not get to "Kapitalku" and you have nothing "will not drive." You just install a new belt, set the labels, and you can safely go further.
- Unpretentious. 8-valve engines are less demanding of the quality of oil and fuel. Yes, you can pour semi-synthetic and 92 gasoline, but this is already as they say - on an amateur, or if conscience will allow :)
- Dimensions. Since the distribution shaft is only one, then the free space under the hood becomes more.
- Power. In the "eight-block" 2 valves per cylinder, so the engine has to try more to produce intake and release processes.
- Fuel consumption. Still, due to the smaller number of valves, compared to the "Sixth" engine, it is more difficult to push the exhaust gases. After all, after one valve, it is difficult to push them than in two.
- Noise. If you put next to the "Sixtar" and "eight-koplop", then "Sack" you are unlikely to hear on the background of the 8-valve engine. This is due to the fact that due to the mechanical pushers and the lack of valve hydraulic components and the gaps need to be regularly adjusted, as it takes place on the pushers.
This type of engine already has 4 valves per cylinder. Accordingly, the distribution shafts are already two: one on the inlet, the second to issue.
But why do you need it? This gives a good increase to the speed of obtaining the fuel mixture and the production of exhaust gases. Increases engine efficiency. More environmentally friendly compared to "eightyclopes" because of the more accurate work of the timing.
There are plenty of minuses here, especially in the money plan. But let's all in order.
- Power. 16-valve engines are more powerful than its 8-valve fellows, which means the maximum speed above and the acceleration time is less.
- Fuel consumption. A higher engine efficiency allows you to save on the fuel, as you need less "twist" the motor to dial the speed.
- Silence. Unlike the 8-valve in this engine there are hydrocomathers that automatically regulate the valve, and the structure itself implies a quieter and smooth operation.
- Butter. Due to the presence of hydrocomathers, the engine requires better engine oil for their normal operation. It is desirable to pour a synthetic, which is an order of magnitude more expensive grades for 8-valve engines.
- Fuel. Also on the fuel should not save and pour the minimum of 95th gasoline.
- Repairs. If something fails, then the repair of "six" will be twice as expensive.
- Dimensions. Due to the enlarged GBC, it will not be so easy to get to any nodes, generator or starter.
Summing up I want to divide car owners into two groups: practical and riders.
A practical one is definitely worth buying cars with an 8-valve engine. Practically unmatched option, power enough for everyday trips, more selection of oils and fuel (semi-synthetic synthetics, 92 - 95), car cost is often cheaper. The only thing - it works a little no more.
Racers definitely 16-valve engine - higher power, lower overclocking time, silence, drive, environmental friendliness. The only thing is the cost of repair and maintenance.
Note. This article is solely informative and is not a benefit or guidance how to do it right and what to choose. Simply put, I just share with you my thoughts and no one forcing anything! ;)
8 or 16 valves, what is better? And what actually the difference. Detail + video
This question is not often, but consistently ask my readers and the viewer of the channel - what is better than 8 or 16 valves in the head of the engine block? Many believe that 8 valve option is the last century and spend its "blood" on it, at least stupid! But 16 is yes, the matter! Others, on the contrary, say that the 16 valve option is more expensive, demanding more in service, if it breaks - "Write - disappeared"! And where is the truth, and actually what is the difference between these two aggregates, are they so different? I propose to weigh all the pros and cons, so there will be a video version ...
THE CONTENT OF THE ARTICLE
You know on the Internet there are really many battles on this endless topic, but as I think everyone is right here in his own way. After all, some are waiting for reliability and not goodness, but other greater power and smoothness of work. Tasks are different, and the engines are different, however, let's use more.
About technical component
Technically, the engine on 8 and 16 valves differ quite strongly. Although all the differences are stored at the top (engine block head), where the vehicle camshafts are installed / installed. In fact, in this and the main design feature lies, but what I want to notice - almost every engine can be made both as 8 and 16 valve option. For example, on our VAZ, the motors are very similar, and hypothetically on the same block, you can plant a different block of block, with one or two camshafts.
8 Valve option
As it becomes clear, in the 8 valve option, one camshaft that controls the fuel injection system and removal of exhaust gases.
Technically, this is implemented so - in each cylinder, on top, there are two valves, one on the fuel injection (opens when the fuel is fed into the cylinder), another release of exhaust gases (opens when the fuel burned and need to release the exhaust gases). The opening of the valves regulates the distribution shaft, it has cone metal parts in its structure, when the shaft rotates, it is pressed by them on the valve, thereby opening either one valve (fuel mixture intake) or another (exhaust gases).
Thus, we have two valves for each cylinder, and as we usually know in the engine 4 - re cylinder, therefore it turns out 4 x 2 = 8, there are no six and eight cylinder types. There, the formula will be 6 x 2 = 12 or 8 x 2 = 16, but such engines are now rare. As you can see anything complicated.
1) "The simpler, the better," the folk proverb sounds. This is also applicable to 8 valve engine, the design has already been tested by time, it has only one distributing, two valves per cylinder. There are few mechanical parts, and respectively repair and maintenance of such much cheaper.
2) Also in such a building, almost never Hydrocompensators that even more simplifies its design. There are mechanical pushers, it is good and bad. Good - this mechanism is much easier, respectively, to replace it or repair it is also easy and cheap. By the way, it is often installing such types. Brushless pistons .
3) It is not very demanding for oil into it you can pour, semi-synthetic oils.
4) It is undemanded to the quality of fuel (of course as part of a reasonable), you can safely pour 92 gasoline and not be afraid.
5) size. The upper part is much smaller, because the shaft is only one. It is easier to chase attached details, generator, starter and other things.
1) The first minus can be noted low power. Sometimes it comes to 15 - 20%, and from the engine in 100 hp (This is 15 - 20 "horses"). The valve is only two, and accordingly the inlet and the release of fuel takes place slower, that is, to achieve high revolutions, as the opponent does not work.
2) Fuel consumption, slightly increased, nevertheless again from the slow intake cycle and exhaust gases. The engine must be stronger than the exhaust gases through one valve.
3) Another minus is noise, it is especially manifested at speed. Mechanical pushers constantly need to regulate, on them developing, gaps appear over time - the clearances appear - the effectiveness of the work falls and noise is manifested! Here you have a negative effect of mechanical pushers.
4) It is necessary to more often adjust the valve gaps for better engine operation. So that it is not possible to recalculate.
If you summarize according to this type, it turns out: - Reliable, unpretentious, simple, you can pour not so expensive fuel and oil (simple and reliable as Kalashnikov machine). But not so powerful and turning, as well as often very noisy.
16 Valve option
Technically, this type carries a more complex design. In one block of the block, two camshafts are combined, divorced along different sides, respectively, the number of valves increases by two.
That is, there are already four valves on the cylinder, two on the inlet of fuel and two on the release of exhaust gases. What does it give us?
First, the power and not bad, the motor more gets an air-fuel mixture and it takes it faster, respectively Efficiency engine increases, boldly you can add 15 - 20 hp (It is possible and more all depends on the volume).
Secondly, many "16 valve" uses hydrocomathers, they give a great fit valve to the shaft, respectively less noise (better smooth operation), fuel economy and power gain.
Also, it is now important, these options are more environmentally friendly, due to the more accurate work of the timing.
There are also enough minuses here, the structure itself is much more complicated and more expensive, demanding about the quality of fluids. Let's look at items:
1) The engine is much more powerful, respectively, the accelerated speaker, and the maximum speed above.
2) Fuel consumption is reduced, firstly due to the design, secondly, due to the fact that the car accelerates faster, do not need to twist at high speeds for a long time.
3) Much quieter than 8 valve, due to the structure, as well as due to the use in the design of hydrocompensators.
4) Valve adjustment is not required, everything automatically adjust the hydrocompators.
1) Almost all 16 valve cars have in the structure of hydrocomathers. In order for them normally function, you need good engine oil, preferably synthetics. And the synthetic is not very cheap.
2) fuel. It is desirable to pour cleaner high-octane compositions, not less than 95.
3) the design is much more complicated, and accordingly, the maintenance and repair will stand more expensive.
4) Repair. If something breaks, the cost of repair is about two times higher than on the 8 valve collected.
5) Dimensions. The head of the block is greater and wider, not so convenient to maintain and repair. Yes, they often dress a plastic decorative lid with a brand (in fact, tribute to fashion).
All the pros and cons of the engines I listed. If you need a non-killed unit, not whimsical to fuel and oil, the power is not important, but to the sound of the engine anyway - then of course 8 valves. If you like to drive, Drive your second I love silence, but ready to pay for oil and more expensive fuel - then 16 valves!
And to be honest, then the "8 valve" motors will die as a view, because they are not so eco-friendly and already in the rigid framework of some Euro 6 - Euro 7 (future) they may not pass!
Now video version article
On this article, finishing, I think, it became a little, it is clear about the engines and their differences. Sincerely your autobalkher.(86. Votes, medium: 4,45. out of 5)
Today we will learn which engine is better, eight-flaped (8V) or sixteenthly patched (16V) What is the difference between power plants and what features do you have Motors
What engine is better: on 8 or 16 valves? Features, differences, pros and cons
Good afternoon, today we will find out What engine is better , eight-lipped (8V. )or Sixteenthlylated (16V ) than Different Power installations iquanki features possess the motors. In addition, we will tell about Design , structure , main specifications Engines equipped 8-Y. и 16-T. Valves as well as what advantages и limitations have Those or other Motors. In conclusion, let's talk about as serviced и Repair engines with one or another valves, on which cars Install Power plants as well Fundaver Lee B. Operating Similar motors .
Question: " What is better than 8 or 16 valves in the head of the cylinder block (GBC) of the motor? ", year after year Many motorists are defined, but an unequivocal response, as such in nature does not exist. For example, some car enthusiasts believe that the motors on 8 valves are outdated modifications of power plants and acquire a car with such an "doping" engine no sense. As for the 16 valve aggregates, then a certain proportion of car owners consider them the opposite more advanced in terms of performance, efficiency and returns. However, if we consider the issue of operational properties, then 16 valve motors no longer look so confidently as 8 valve, as they are much more expensive to serve, besides, they are more demanding on fuel and lubricant materials. In addition, if it comes to repair, then again, a motor at the motor on 16 valves does not look like everything is so rosy, like the 8 valve fellow.
What is the DOHC engine. Features and design
If we consider the motors on 8 and 16 valves from a technical point of view, the power plants are really significantly different. The distinction of the engines is concentrated in their upper part, that is, in the head of the cylinder block, because it is here to establish eat Or installing either camshaft( ы). In principle, it is in this design feature that the main difference between the motors lies. We refer to refer to which almost 16 valve and vice versa can be made from almost any 8 valve engines. Thus, as we noted, the main difference between the power plants is the number of camshafts ( 1or 2) and based on this different number of valves per cylinder.
1.Eight valve engine. Features, Features, Pros and Cons
As we know the 8 valve motors are equipped with only one single camshaft, which simultaneously performs fuel filing functions in cylinder combustion chambers and removes spent gases from the system. how this is Looks like в Technical Plan ? Such a structure of the engine is implemented in such a way that on top of each cylinder is 2 valves, one of which runs on fuel injection, i.e. it opens when fuel is fed to the combustion chamber, and second Performs tasks for the release of exhaust gases, that is, it opens when the fuel has already burned down and it needs to be removed from the system.
Adjusting the opening of the valves in full is controlled by camshaft, which is equipped with conical metal elements in its structure. When the shaft comes into rotation, it presses the first valves using convex cone elements, due to which they are opened on the fuel inlet, and then when the shaft turns again, the second valves on the release of exhaust gases is opened.
As we know, in a typical 8 valve motor, which consists of 4 cylinders, each cylinder accounts for 2 valves, so in the amount it turns out the number 8 or 8V ( Official designation ). We also note that in nature there are also 6, 8 and 12-cylinder types of power plants, in which the number of valves will be different than in 4-cylinder engines. However, such engines are highly rare and occur pretty not often on public roads.
Pluses of power plants with 8 valves :– Simple design which is a guarantee of reliability and durability, which is fully applicable to 8 valve motors. By itself, such an engine is a time-tested time and is equipped with a minimum number of nodes, a bright example of this judgment is only one camshaft, as well as 2 valves per cylinder instead of 4 units, as in a 16-valve power installation;
- In such motors there are often no hydrocomathers, which are still stronger simplifying and without that simple engine design. The power plants of this type are equipped with mechanical pushers, which are five times much easier in their structure, and it is not necessary to replace or repair them. As a rule, the motors of this kind are obtained by the pistons of a braveless type that are much longer than the usual.
- Due to the simple design of motors, 8 valves are not at all demanding to fuel and lubricants. They can fill semi-synthetic engine oils and refuel low-fuel;
- Such engines are much compact 16 valves, as they do not have an additional shaft. It is also reflected in the weight and smaller number of attachments.
Minuses of power plants with 8 valves :- The main disadvantage of such engines is the low power they develop. As a rule, on average, the power of the 8 valve engine is about 20 percent lower than 16 valve installations. We should fine with the 8th valves have only 2 valves per cylinder, that is, one on the intake of fuel, and the other to the release of exhaust gases, therefore the system functions slower and reach high revolutions, as a 16-valve is simply not destined to ;
- As for the fuel consumption in such engines, it will be higher than that of 16 valve, since the inlet process and their release occurs slowly. Therefore, the motor must be stronger to push the exhaust gases using only one valve, that is, the effort is attached 2 times more;
- the disadvantage is also an increased noise when the power plant is operational, it is especially clearly traced at high speeds ( more than 60 kilometers per hour ). An important nuance is that the mechanical pushers from time to time need to be adjusted, and over time, it is formed and gaps appear on them. Because of these moments, the performance and efficiency of work is noticeably reduced in motors, and noise increases. As we can see for cheap maintenance of mechanical pushers, quick wear can be hidden.
- Also in frequent regulation need valve gaps. Although regulation can not be done, but then the efficiency of the motor operation will decline, and fuel consumption increase.
Thus, as we see from the above positive and negative moments that have power plants equipped with 8-valves, it can be noted that such engines are still reliable, unpretentious, simple in maintenance with repair and non-demanding fuel and lubricant materials. Some vehicle maintenance experts such motors are compared with the reliability of the machine " Kalashnikov ", Which is trouble-free in any situation. However, the 8-valve engine does not apply to powerful, turning and quiet in the work of aggregates. Therefore, these nuances should be considered when choosing a vehicle equipped with such a power plant.
2.Sixteen valve engine. Features, Features, Pros and Cons
In technical terms, the motors that are equipped with 16 valves are considered much more difficult in the structure of their fellows with the 8th valves. The structure of the power plant in the head of the cylinder block has 2 camshafts that are divorced along different sides. Because of such a structure, the motor is equipped with 16 valves, that is, 4 elements per cylinder and exactly 2 times more than in the 8-valve units. The engine of this type has 2 valves on the inlet of fuel and 2 to the release of exhaust gases.
what Same We give 2 camshafts и 16 valves ?Well, most importantly, we get a good power at the exit, since there is more fuel and air mixture into the power plant, and the exhaust gases from the cylinder combustion cameras are faster. In this connection, the coefficient of useful increases significantly, which is clearly reflected in the additional horsepower ( reference : about 15-20 percent of horses more than in 8 valve engines). In addition, 16 valves are equipped with hydrocomathers, which are much better pressed the valve to the camshaft and, as a result, noise decreases when the engine is running, and the smoothness of the stroke is improved. Also, these design moments allow you to save fuel and at the same time get additional power. In addition, the motors on 16 valves are more environmentally friendly, due to the more accurate operation of the gas distribution mechanism.
Pluses of power plants with 16 valves :- the motor of this type is much powerful, which is also reflected in the acceleration dynamics and the maximum velocity of the car;
- Thanks to the special design of such engines, fuel consumption is noticeably reduced. In addition, it also affects the quick acceleration from the scene, because it is not necessary to unwind the revolutions for a long time and keep them high;
- significantly quieter in work, again, due to the modified design and the presence in the installation of hydrocomathers in comparison with 8 valves;
- It does not require planned and unscheduled valve adjustment, since the hydrocompensators automatically produce their setting during engine operation.
Cons of power plants with 16 valves :- Most of these motors have in the structure of elements such as hydrocompensators and that they optimally worked, it is necessary to pour on the installation of motor oils only high quality and fully synthetic, so service costs will be noticeably larger than in 8 valves;
- refueling such a motor only with high-octane flammable, as a rule, not less than 95th gasoline. As they say, the higher the octane number in the fuel, the better for such an engine. Again, this is reflected in more expensive maintenance;
- Since the design and structure of the power plant is much more complicated, therefore, the cost of repair will also be higher than that of the 8 valve motors. On average, with a breakdown of a node, the repair of the car owner will cost approximately 2 times more expensive;
- Not compact, due to the big head of the cylinder block, which is wider than the younger fellow valve. In addition, due to the large size of the engine, it is not convenient to serve, and also repair. But on such installations, it is often installing a decorative lining with different nameplates to give a mode, because the motor dimensions allow it.
Thus, as we see from all the above pluses and minuses of 8, as well as 16 valve engines that there is no explicit leader in all directions. For example, if we need a more or less durable motor and, moreover, not whimsical to fuel-lubricant liquids, while the role with high noise when working the role does not play, it is definitely better to buy cars with power plants on 8 valves. However, if we do not like "tedious" cars and sometimes you want normal dynamics with silence while driving, then you need to purchase cars with a 16 valve engine, but it should be remembered that they will be more expensive in maintenance with repair.
Video: "What is better: an engine on 8 or 16 valves? Differences, resource, advantages and disadvantages "
In conclusion, we note that Engines on 8 valves based on the opinions of specialists in service and repair vehicles are optimal motors for calm, as well as measured movement by car from point "A" to the point "B", but no more. That is why many modern models of cars are less equipped with 8 valve power plants. Let's notify that today this type of motor is mainly installed on Cars out The budget segment, on the example of such brands, like Volkswagen Polo Sedan, Skoda Rapid, Renault Logan, Renault Sandero, Lada Vesta, Lada Ixray and other models.
THANK YOU VERY MUCH FOR YOUR ATTENTION . Leave your comments ,Share with friends .
Since the overwhelming majority of car owners travels on domestic cars, then this review will be devoted to the vazov engines, and today we will talk about what the 16-valve motor is better than the 8-valve, and also give the main arguments on this matter.
In one of the past, I considered these motors, but there, on the contrary, I brought the advantage of the 8-CL. DVS, and now we will do everything on the contrary - I will try to bring all the advantages of modern motors with 4 valves on the cylinder, as they are at the moment are more popular and distributed.
Agree with me or not - the case of everyone, and I will say even more when I traveled on the vases, I preferred a simpler motor with two valves to the cylinder. But this does not mean that there is no advantage of the so-called "pigember" - of course there is, and we will talk about them right now.
1. Fuel consumption
As if we did not want to think that one camshaft and a simpler design of the GBC will contribute to lower fuel consumption, but this is unfortunately not so. The presence of its own intake and exhaust camshaft, as well as two valves for the inlet and on the release, make their own. Ultimately, a more advanced system of gas distribution leads to a decrease in fuel consumption.
2. Increased power and elasticity
With the same volume of the engine, the power can differ significantly, and as you have already guessed, to the whole side, it is precisely 16-CL. Silent unit. Take for example our Lada Grant and compare the power characteristics of the motors of one volume of 1.6 liters:
- 8-CL. DVS has 87 hp
- 16-CL. Motor is 98 or even 106 hp (more advanced version)
And if earlier "Shecks" could not boast of the bottom, now they are deprived of this shortage and show themselves perfectly in the entire range of revolutions, which makes them very elastic. Simple words: on 5 transmission you can safely go to both 60 km / hour and 120, not feeling discomfort both in the first and in the second case.
3. The presence of hydrocompensators
All the owners of eight-flaped vases know perfectly well that sooner or later have to perform such a procedure as valve adjustment. An increased gap leads to an unpleasant knock when the engine is running, and the "clamped" valve can cause a decrease in compression, power and stable operation of the OI, as well as other more serious consequences.
From 16-CL. Everything is much easier: Here, instead of standard pushers with adjusting washers that are inherent in 8-cells. The engines are installed hydraulic components that "regulate" themselves and set the desired gap, respectively, without requiring any intervention from the driver.
4. quieter in work
Thanks to its successful design, more balanced operation of the MRR, this engine has fewer vibrations when working, as well as due to installed hydraulic components, the valve knock is almost excluded, because the gaps are always "selected" perfect. Perhaps this is not such an important point, as many may seem, but agree, more pleasant to listen to the motor, which "whispers", and not the one that "bubbles."
I think, not many is dealing before which carbon dioxide emissions are there as a result of the exhaust of each of the motors under consideration. But not even especially going into details, it is simply purely logical, comparing 8-kl. And 16-cells. Motors, you can say which one eats up nasty to the atmosphere - one that more consumes fuel and is less technological. And here, as you understand, "Shersna" wins.
Well, if all these items are not particularly important to you, and the main indicators are high reliability, unpretentiousness, simplicity and low cost in service, then your choice is simple as "stick-rope" unit with an 8-valve GBC.
Did you like the review? Put like this article, write your comments below if you have something to add on the topic, and do not forget to subscribe to the channel.
Today, on cars, you can meet various types of internal combustion engines, ranging from low-pass 3 cylinder units and ending with powerful V8 or V12. In this case, the overwhelming majority of the car under the hood have familiar motors with 4 cylinders.
If earlier such power units were raised on the initial and middle class models, at the moment the 4-cylinder engine can be seen even in the premium segment.
The fact is that the forcing, an increase in the number of valves per cylinder, the introduction of gas distribution phase change systems, the turbocharging installation and other improvements made it possible to achieve the necessary power and efficient returns from such motors.
The most affordable solution to increaseKpd.
It turned out to be a design, which involves a greater number of valves per cylinder. In the simplest version, the engines may have 2 valves (intake and graduation). In more technological versionsGRM
Gets 4 or 5 valves.
In this article we will talk about what is the difference between 8 valve from 16 valve engine, as well as which engine is better, 8 or 16 valve. Next, we will try to figure out what advantages and disadvantages have more or less valves in the motor, taking into account the repair and maintenance of such internal combustion.
More modern 16 valve engine and 8 valve: difference
Let's start with the fact that four-cylinder engines with 8 valves (two for each cylinder) are a long-standing, reliable and time-tested construction. Today, such motors some auto manufacturers are actively installed on their budget versions of cars.
Also on a similar vehicle model can be found and a more modern 16 valve engine. In other words, the buyer can choose a more appropriate type of engine. For a better understanding, it is necessary to figure out what advantages and disadvantages have one and other design.
Advantages of eight-flaped motors
So, the version with 8 valves is initially cheaper and is usually placed on cars in the simplest configuration. This is done to maximize cheaper. Such a motor on each cylinder has one valve for the intake of the fuel and air mixture and one valve for the release of exhaust gases from the cylinder.
Structurally 8 valve engine has one camshaft. The timing of timber can be implemented both by installing the timing belt and with a chain. The main advantages of such a design can be considered simplicity and availability of repair, as well as unpretentiousness to the quality of fuel and less demanding to the quality of engine oil.
It turns out, repair and maintenance of the engine with 8 valves costs cheaper, which looks like an indisputable advantage for the owner of the budget car. If it is necessary to seriously repair in the 8-valve motor, it is usually changing less details compared to more modern counterparts.
- Engines of this type are well suited for severe operating conditions (loaded modes, low quality fuel and fuel, contaminated air), it is easier to maintain and repair.
- As for the valve bending when the timing belt / chain break, most of the 8 valves units have more chances not to suffer compared to 16 valve versions.
- Also, the engines with 2 valves per cylinder are smaller in size, it is easier to install them in cars with a small size of the boost space, access to attachments during repair is less difficult. From this it follows that it is not possible to maintain and repair eight-flaped internal combustion engine, but also more convenient.
- We also add that these engines are better suited for installation on them HBO. Easy to implement the timing and an enlarged resource of such a design allows units with 2 valves normally work on gas for quite a long time.
Disadvantages of 8-valve engines
However, the common simplicity of the device has its drawbacks. First of all, manufacturers pursue the purpose of total savings during the manufacture of such internal engine. This is manifested both as the execution of individual elements and in the absence of some solutions to simplify service.
For example, many 8 valves engines imply the need for additional adjustment of thermal valve gaps. This means that in such an inlet, there are no hydrocomathers. On the one hand, this is a plus, since the requirements for the quality of oil are underestimated, while still the need to periodically adjust the gaps manually.
If we talk about the power of such engines, the total diameter of the holes for 2 valves will still be less than a diameter of 4. This means that the working mixture does not flow into the combustion chamber, the cylinder is deteriorated.
After burning the fuel charge, the spent gases are slower and less efficiently outlined from cylinders, that is, ventilation deteriorates. All this leads to the fact that such an engine is characterized by a slow reaction to the press of the gas pedal.
It turns out that the inhibition of this type is not suitable for active overclocking "from the bottom", while not bad "pull" on low revs. Acceptable speaker is achieved in an average revolution range, that is, the motor needs to be twisted. As a result, such aggregates naturally spend more fuel. Some comments arise and as applied to comfort. Motors with 8 valves vibrate more, can work less steadily, noisy.
Pluses of 16-valve engines
The main advantage of such a motor is the best return and high power with the same working volume. In parallel, fuel efficiency is achieved. The thing is that the inlet and release system on such aggregates works more efficiently.
As we have already spoken, four holes under the valves have a greater total diameter compared to two. Due to this, per unit of time in the combustion chamber, it is possible to submit more working fuel and air mixture, and more efficiently withdraw the exhaust gases.
As a result, the filling of cylinders is improved, the mixture comes more evenly, the combustion occurs is more costly. Subsequent ventilation is also implemented at the best level. It turns out, thanks to such peculiarities, the 16-valve engine is more powerful than a similar 8-valve by 15-25%. In this case, such an engine will be more economical.
- In parallel with this, the sixteenthlylated motor has hydrocompensators, which allows you to constantly maintain the specified thermal clearance of valves in automatic mode.
- Due to the optimized process of combustion combustion in the cylinders, the engines of this type are considered more injective and elastic, well pick up with low revolutions, have a more even regiment of the torque.
Minuses of motors with 16 valves
First of all, the GDM device in such aggregates is more complex. At the same time, it is necessary to highlight the increased sensitivity to the quality of engine oil and fuel. Contamination of the lubrication system or the working fluid leads to a rapid output of hydrocompensators.
As for repair and maintenance, such an aggregate is more complicated and more expensive. The design assumes not only hydrocomathers, but also two camshafts (one for intake, the other for exhaust clan), as well as a larger number of valves.
Any operations related to the repair of the MRM (replacement of valve oil replacement, valve replacement, valve triggering, replacement of hydrocomathers, camshaft repair, etc.) will require twice the cost of spare parts and work.
Certain difficulties also arise with the replacement of the drive mechanism of the gas distribution, since more accurate phase settings are required, the special requirements are put forward to the maximum accurate insertion in the labels.
As for the installation of gas-ballon equipment, the motors with 16 valves are more demanding on high-quality HBO setup, since malfunction and disorders of the mixing can lead to a rapid fixing valves when working per gas.
What power unit is better to choose
If you summarize all the features listed above, then the following becomes clear:
- Motor with 8 valves is easier to maintain, cheaper in repair, it works better on fuel and low-quality oil, well suited for installing HBO. In this case, such an engine consumes more fuel, gives less power, is more vibrating and noisy.
- The power unit with 16 valves allows to achieve better dynamics, it is more powerful, consumes less fuel, does not vibrate so much. In parallel, the requirements for the quality of fuel and lubrication increase, the costs of maintenance and repair increase.
If there is a choice of these two types of internal combustion engine, then individual preferences and features of subsequent operation should be taken into account separately. In the case when dynamics and efficiency is needed, while the car is planned to be serviced on a professional service station, then optimally acquire a more technological 16 valve option.
If the questions of the dynamics, capacity and fuel economy are not so important, while it is planned to serve the car on its own to save or taking into account the lack of opportunity to visit the service station, then the motor with 8 valves looks like a more appropriate option.
We also add that today many engines with 8 valves are also equipped with hydrocomathers. This means that the requirements forQuality of oil and its timely replacement
For such ICEs remain elevated. Also in most cases when the belt cliff or the timing chain on 8 valve aggregates alsoGnet valve
It turns out that their main advantages remain the more affordable initial price of the car, less sensitivity to the fuel and composition of the fuel and air mixture, as well as the simplicity of repair, especially with independent service.
It is not difficult to guess that 16 valve versions are natural and quite actively displacing simplified variants with 2 valves per cylinder. If we talk about buying a new car with 8 valve engine today, then only a more attractive price is often a decisive argument.
We also recommend reading the article aboutWhat is the opposite engine
. From this article you will learn about the features of the design, as well as the advantages and disadvantages of the specified type of engine.
The machine with such a motor will cost 15-20% cheaper compared to a similar model, but already with 16 valves. At the same time, the cost reduction is achieved not only due to the difference in power plants. The fact is that manufacturers also try to make versions of cars with 8 valve internal combustion engines the most low-cost, that is, as simple as possible by configuration.
This approach is very important in the lower price segment, allowing you to form a profitable offer for buyers with strongly limited financial capabilities or for those purposes when cars are purchased for commercial use (taxi service, etc.).
If the new car is purchased for itself, and it also does not plan to independently maintain and repair, then it is better to pay a little and purchase a car with a more powerful and modern 16 valve engine.
However, if you compare eight and sixteen-precipitated versions on the secondary market, then in some cases it is best to pay attention to a simpler design. With the fact that 8 the valve motor is simpler and is not so sensitive to the quality of the fuel, the chances of acquiring a workable serviceable instance increase significantly.
At the same time, even if the engine will be required to repair, the cost of the restoration of DVS will be significantly lower, due to its maintainability and accessibility of spare parts. However, we should not forget that the purchase of such an aggregate for forcing, the installation of the turbine and another tuning may be unjustified.
It is for this reason that one of the common types of tuning car is a replacement of 8 valve engine at 16 valve, after which further improvements are made. At the same time, power units with 8 valves have proven themselves as simple engines on civilian workers' cars, whereas for obtaining greater power, another option is definitely preferable.
Eight valves, 16 valves, even 20 valves. When it comes to engines, then for a short period of time, how many valves you have, it was one of the most important characteristics.
Why do you need a miniature 8V model when you can work even faster from 16V? And then, for a short number of years, you could even get VW or Audi from 20V. So let's learn what is the difference between the 16 valve engine from 8 valve and which engine is better than 8 or 16 valve?
What are they doing?
When removing the driving force from gasoline inside the engine, the inlet and the release of air and fuel is likely to be the most important thing you need to worry about. Forget about the spell, you must think about air intake. When you pumped air, there will always be one big limit - a bottleneck. A place where enough problems, and it will be a decisive place over which you need to work to make sure that the air and fuel flow. In the case of an internal combustion engine, this place is at the bottom of the cylinder head.
You need a durable, durable valve to hold the explosion in the cylinder. You also need it to be less than the surface of the piston surface. And you need one to let air and one, to release the air again.
For decades, most engines had two valves. One for inlet, one for exhaust. Just, easily, effectively. But there were limits. You see, you can make the valve so big so that it gets into the piston, the wall of the cylinder or another valve.
And even when they approach this maximum size, the air can no longer contep them without opening the valve. This is called a high rise, named after the camshaft camshaft, raising the rocker lever, which opens and closes the valve is higher than usual.
So you do when you need more air, but you can't increase the valve?
You just add more, this is the difference between the 16 valve engine from 8 valve, the 16-valve gives more air. Are there any other options to add more air? There is. Add forced induction, for example, turbocharger or supercharger. Adding a larger number of valves adds complexity.
And cost. If this is a V-shaped engine, you probably need to switch to the upper courses. Even for the engine with the top camshaft, you need to "pack" more valves, more scenes, more springs and distribution shaft with lots of petals. This is all really difficult. Large valves give more open surface for air flow.
Let's consider why. 40 mm is a fairly common size for inlet valves on 8V engine, with 33 mm for exhaust. We will explain why the exhaust is less than later.
On the 16V engine consumption is 32 mm, with an exhaust of 28 mm.
Each 40mm valve has 1.257 mm ^ 2 surface area. Each 32-millimeter valve has only 804. The circle area is based on the square of the radius and the like. Thus, the head 16V has a surface area of 1 608 mm ^ 2, most of which can pass the air flow into the cylinder. Yes, we missed the valve rod area, but it does not matter.
An important part is that he can skip almost a third more air, which means a third more fuel. Which means more explosion every time with a wide open throttle. I hope you have already understood that it is better than 8 or 16 valve engine, but that's not all.
Since the exploded air charge and what used to be fuel, much hotter than the outer air, it is under higher pressure. Therefore, when the exhaust valves open, the air is more than "glad" to get out of the engine. So I am glad that the valve is 85 percent less than the inlet valve, can be moved enough air.
To power the engine used an odd number of valves. So why didn't it last long? Well, for a start it is even more difficult. More cams, more springs, more rockers, most. And the benefits are less. Three intake valves 26.9 mm per 20 V have an area of surface 1704 mm ^ 2. Now the additional valve rod unexpectedly became more efficient.
Air coming from three valves instead of two is also turbulent, which reduces power. In addition, thanks to the modern fuel nozzle with the immediate injection in the cylinder head, there is not enough space. Do not forget that you still need an ignition candle.
There is another advantage for several smaller valves when it comes to high revolutions. With one large valve, heavy weight needs a large spring for control. And when the engine begins to rotate very quickly, the valve can still have a point in which the spring does not control it anymore. He closes when he wants, and not when it should.
This is called the "floating" of the valve. It is bad, because then the valve can hit the piston. It can also allow all air, fuel and exhaust to go wrong. Smaller valves are easier, so they can move faster before they start swimming.
This is another reason why to compare 8 valve engine and 16 valve engine simply fail, since the 16 valve will almost always win.
The difference is also a simplified design, manufacturers usually try to save on the production of 8-valve engines and use a rather primitive scheme with manual control of thermal gaps. This, of course, can be called a minus, because such work can take a lot of time, and the blow on the inlet system can occur very unexpectedly.
Pluses of the 8-valve engine
8 Valve and 16 valve engine, definitely, different models, but to talk about the advantages of the first model, also need.
In the case of inexpensive cars, 8-valve engines are commonly used. Such engines are always equipped with a switchgear shown in motion a relatively simple belt-based mechanism or chain. Thus, the repair and maintenance of the 8-valve engine is significantly cheaper, even in case of a serious breakage, it is necessary to replace a smaller number of parts. Such an engine is better to choose to work in difficult conditions where it is difficult to find qualified mechanics.
The engine without automatic hydraulic compensators is not so sensitive to the quality of the oilfilled oil and can work on gasoline not very good quality without the risk of fast breakage. The difference is also in the smaller geometric size of the valves. Therefore, an open toothed belt is not terrible for the engine, if there are special grooves in the pistons, the valves simply fall, which prevents serious damage.
The advantages of 8-valve engines include smaller inlet sizes, which provides easier access to many details, such as a generator and starter. The specialists of the workshop confirm this fact, they say that to repair the eight-flaped aggregate is much easier.
The difference may be not only in this, but also in the need for a periodic tension of the toothed belt using a special mechanism.
You do not need to do it manually, but you need to carefully monitor the strap alignment and the position of the camshaft to avoid synchronization loss. Therefore, it is recommended to maintain an engine with 8 valves on an inexpensive vehicle every 20,000 kilometers to eliminate the risk of breakage.
What should I stop your choice?
We bring to your attention 5 engines that we consider the best:
Ford 1.0 EcoBoost.
Engine 1.0 EcoBoost was presented in 2012 and entered most of the Ford models, from Fiesta to Mondeo.
Customers could choose from versions, developing 100, 120, 125 and 140 hp. Despite significant efforts, the device was durable. Until 2013, the cooling system was a problem. Some cars found leaks in the pump and water canals. The subject of the service action was a hose subject to cracking between the expansion tank and the turbocharger.
Mercedes 2.0 CGI
Mercedes had many jets with a superposure. Thanks to characteristics and historical events, the concern more willingly used compressors than turbocompressors.
After all, even in Stuttgart, Turbo was considered the only right way. The new four-cylinder engine was not built from scratch. The engine code M271 (2002-2011) was used with direct injection, and the compressor was replaced by the exhaust gas turbocharger. As a result, the engine became economical with a calm ride and developed 156-20 pp.
Changing the concept of the supercharger also solved one of the main problems of the old engine, namely, problems with the compressor. However, with a large mileage, it is necessary to prepare for the replacement of the worn out chain of the timing chain - a single-row chain that is not very durable.
Opel 1.4 Turbo
Over the years, Opel offered gasoline engines with a superposition that could cope with the need to ride a poorly adjustable gas installation, and it was not necessary to change the oil.
To keep up with competitors, Opel had to update the range of engines. One of the new era engines is 1.4 Turbo, represented in 2010 (also installed on Chevrolet). It develops a capacity of 120-140 hp, and in some models it has been equipped with a factory setting for liquefied petroleum gas, which works very well due to the indirect fuel injection and hydraulic compensation of valves, which, for example, are not available in undegraved motors 1.6.
FIAT 1.4 T-JET
Engine Series 1.4 T-JET created for long-term operation. With proper maintenance of more than 300,000 km.
Properly installed LPG and even attempts to configure, which were often used by Fiat, creating subsequent versions of ABARTH 500 / Punto, do not harm it. In the top versions of 1.4 T-Jet developed 190 hp Its basic options 105 hp, which proves how universal engine is.
Renault 2.0 Turbo.
Depending on the version, the engine offers 165-275 hp
Due to the high torque (at least 270 nm), it allows you to enjoy smooth driving even in basic versions. So that the engine worked for a long time, the driver must remember the need to replace oil and timing belt.