Ten years later, this SKYACTIV can definitely become a classic in an engine, and the most commendable thing about it is, of course, the combustion ratio that this engine can achieve.

As we all know, the optimal combustion ratio of air to gasoline is 14.7:1, which means that the closer the combustion ratio of the car is to this value, the more fuel efficient it will be, and the best power increase effect will be achieved with the least amount of fuel.

In recent years, people have used various technologies in the engine, such as variable valve timing technology, such as turbocharging, such as direct injection in the cylinder, etc., all of which are aimed at increasing the proportion of air in gasoline during combustion, so that the engine can achieve the best combustion effect with only the least amount of fuel.

Later generations of major car manufacturers have popularized turbocharging and in-cylinder direct injection technology, which were originally only used in luxury high-end cars, to ordinary family-level cars, in order to save fuel as much as possible without reducing power output, and rely on these technologies to compete for consumers.

And this SKYACTIV technology was actually born in this context.

IT'S JUST THAT JIN XIAOQIANG'S ECOBOOST ENGINE CAN BE SAID TO BE ADAPTABLE, EVEN V8, EVEN V10 AND OTHER ENGINES WITH MORE CYLINDERS AND LARGER DISPLACEMENTS, AND THIS SKYACTIV BLUE SKY HAS BEEN COMPLETELY FUEL-SAVING SINCE ITS BIRTH, SO THIS ENGINE HAS APPEARED ON THE 4-CYLINDER ENGINE FROM BEGINNING TO END.

AND STRICTLY SPEAKING, THIS SKYACTIV ENGINE IS FUNDAMENTALLY DIFFERENT FROM THE ECOBOOST ENGINE THAT JIN XIAOQIANG AND THEY HAVE RESEARCHED BEFORE, HE JUST FULLY INTEGRATES THE IN-CYLINDER DIRECT INJECTION TECHNOLOGY AND VARIABLE VALVE TIMING TECHNOLOGY, BUT THE TURBOCHARGER IS ONLY AN OPTIONAL CONFIGURATION.

However, compared with the ECOBOOST engine originally invented by Ford, Mazda's engineers made a bold and more direct and thorough approach.

You must know that the current technology of the world's mainstream 4-cylinder engine, in fact, is almost the same, the arrangement of the cylinder, as well as the exhaust, the arrangement of the intake, is also not much different, the biggest difference between the major manufacturers of the engine, is whether it will be adjusted in the ECU of the engine, or there are differences in some small details.

However, in general, it will not change the pattern of engine intake and exhaust, you must know that these have been determined by thousands of experiments by predecessors.

But this time Mazda's project is very bold, they extended the exhaust path of this engine, originally most engines used the 4-1 exhaust method, that is, after the exhaust pipe of each cylinder block extends from the cylinder block, it will directly converge to a large exhaust pipe, and the exhaust gas of the car will be directly discharged to the outside.

The 4-planer exhaust method redesigns and rearranges the direction of these exhaust pipes after extending from the cylinder block, so that they are connected in pairs, but the length of the exhaust pipes is extended, and finally converges on the main exhaust pipe.

In fact, the four-cylinder automobile engine on the market is not unable to achieve a high compression ratio, in fact, as long as the turbocharger is used to increase the pressure of the intake manifold, more air can be injected into the cylinder, so that the air and fuel in the cylinder can reach or exceed the optimal combustion ratio.

However, there are several problems that cannot be overcome, such as because the intake pressure is large, so the exhaust pressure will also increase, so that in the exhaust process, some gases will be difficult to discharge cleanly, and will return to the combustion chamber again, as if the temperature of the combustion chamber is too high, and in the process of returning, it will also hedge with the exhaust gas, resulting in a series of problems such as engine explosion and crash.

These problems have plagued many engine engineers for many years, but they have not been solved.

Therefore, in the ordinary engines currently circulating on the market, the combustion ratio is generally 8:1 or 9:1

Even lower, even with turbocharging technology, the air-fuel ratio is generally 10:1.

Even after the direct injection technology is used in gasoline engines, although the air-fuel ratio of gasoline engines using this technology can reach more than 14:1, or even tens to one, it is not difficult to achieve it.

But in reality, there are very few engines that can really do this, even Toyota, which is a master of in-cylinder direct injection technology, can only do this in the laboratory, but when it is really applied to mass production engines, they can't easily increase the air-fuel ratio of their engines to the point of 14 to 1. …,

At present, the best air-fuel ratio can be made, that is, the ECOBOOST engine invented by Jin Xiaoqiang before, and the air-fuel ratio that can be achieved by that engine is only the best to reach about fifteen to one, which is already a very remarkable achievement in the current market.

In later generations, it was not until Mazda announced the engine of this Skyactiv technology that the problem of increasing the air compression ratio and solving the problem of engine explosion was solved, which is the reason why Mazda is so popular, because they are the first manufacturer to make the engine with such a high air-fuel ratio to the civilian population.

Mazda's engineers have the best way to solve the same problems such as shock explosion and crash is to extend the path of engine exhaust, and it is such a long path that can reduce the gas in the combustion chamber and reduce the temperature of the top dead center of the compression stroke, which is very effective in solving the shock explosion problem caused by the high compression ratio, and such technology can also better adapt to the various types of gasoline sold on the market.

It is this engine that really brings the civilian engine into the era of higher combustion ratio.

And it is precisely because of the outstanding fuel-saving energy of this engine that this car is very popular as soon as it is launched.

While changing the length of the exhaust path, the engineers also redesigned the engine's pistons, and they designed a depression at the top of the pistons, which was done to make the engine burn more efficiently when it was working.

Coupled with variable valve timing technology, the engine's performance in terms of combustion efficiency and torque is directly improved by more than 15 percent!

These conclusions, which have been reached by the engineers of later generations, have now all belonged to Jin Xiaoqiang in just a few days.

When Liu Xiaoliang watched Jin Xiaoqiang complete the first draft design of this engine, he could only shout in his heart, his old friend is a pervert.

Otherwise, who would be able to rebuild such a complex engine in just a few days?

You must know that for a veteran car person like them, it is too easy to draw a four-cylinder engine, but if you want to redesign one, how difficult it is, everyone knows very well.

After all, even if you're making changes to a normal 4-cylinder engine, you have to make a case for it, and you have to come up with your own arguments to support why you're doing it.

For example, Jin Xiaoqiang strengthened the compression ratio this time, which made Liu Xiaoliang very incomprehensible, you must know that before this, even if the engine uses in-cylinder direct injection technology, generally speaking, everyone thinks that it is not easy to make the engine's in-cylinder combustion ratio reach 14:1, because it requires a large pressure pump.

And at present, the most in-cylinder direct injection technology they do is used in the V6 engine they produce, and the V6 engine has a long exhaust road, so the problem of detonation is easy to solve.

But if you want to apply these technologies to a 4-cylinder engine, and want to solve the problem of cylinder knockout, it is enough to make an engineer scratch his head.

AT THE BEGINNING, LI QIMING THOUGHT THAT THE DOWNSIZING OF THE ECOBOOST ENGINE WAS VERY SIMPLE, BUT HE SIMPLY FOLLOWED JIN XIAOQIANG'S DRAWINGS TO TYPE THE ECOBOOST HE DESIGNED, BUT THE RESULT SURPRISED EVERYONE.

After the 2.0 AMOUNT ECOBOOST engines he drew were used in tests, there were often problems such as detonation and crashes, and Li Qiming thought of many ways to solve them, but he couldn't solve them.

It wasn't until he finally solved the problem by taking it upon himself to reduce the pressure of the pressure pump and redesign the nozzle.

What's more, what Jin Xiaoqiang is doing now is to redesign an engine, he just changed the path and length of those exhaust manifolds, and he can achieve the effect of increasing the combustion ratio of this car.

Finally, after seeing the countless mathematical formulas listed by Jin Xiaoqiang, he finally understood the feasibility of this method.

AND JIN XIAOQIANG ALSO REDESIGNED THE ENGINE PISTON, WHICH MAY BE FROM ECOBOOST

Where to get the experience.

THIS ENGINE DOES NOT NEED TO BE EQUIPPED WITH A TURBO, WHICH IS THE BIGGEST DIFFERENCE BETWEEN THIS ENGINE AND ECOBOOST.

However, the diesel version of this engine must be equipped with a turbo, but now is not the time to think about that.

While redesigning the exhaust manifold of this engine, Jin Xiaoqiang also used new materials in many parts of the cylinder block, which greatly reduced the weight of the engine.

For example, in terms of curved rails and connecting rods, etc., under the condition of ensuring strength, he tried to lighten these parts as much as possible, don't look at these accessories are not too big, but if they are assembled together, their total weight is quite amazing.

You must know that SKYACTIV technology is not only the technology of an engine, but also the reduction of the weight of the body!

After drawing the sketch of this engine, Jin Xiaoqiang plans to start working on the body and chassis of the Skyactiv technology, as well as the transmission technology.

You must know that the Skyactiv announced by Mazda is definitely not only for the engine, this technology, but also for the entire body of the technology, including from the body to the chassis, to the engine and gearbox, etc.