Manufacturing Empire in the Valley

Chapter 1386 Shocking Engine Compression Ratio

The better the design and the better the manufacturing process, the better the engine will perform.

The engines of Fang's heavy trucks obviously cannot be compared with similar products in Europe in terms of manufacturing process. This is beyond doubt. Could it be that their design concepts surpass those of their European counterparts?

Kitano Shin thought of this and asked the technician to bring over the drawn engine structure diagram, and he couldn't help but widen his eyes after seeing it: "Well, with such a high compression ratio, aren't they afraid of cylinder explosion?"

Kitano Nobu is a veteran, and he can tell the excellence of this engine at a glance.He found that the cylinder block structure of the engine of Fang's Heavy Truck produces an ultra-high compression ratio. Through a rough calculation of the cylinder block size, the compression ratio of this engine is at least 30.00% higher than similar engines in Europe!
For an engine with the same displacement, the higher the compression ratio, the more energy the engine can obtain from fuel, which is a common feature of all internal combustion engines.

I don't know how many car manufacturers have tried their best to increase the compression ratio, and the turbocharger device is a brand new engine design idea that was born because of this.

This engine, manufactured by Asia Machinery Works, does not have any turbocharger installed, but its compression ratio is better than that produced by the turbocharger known to Kitano.

This is because the pistons of this engine compress the space inside the cylinder more powerfully, so that the mixture of fuel and air will explode with more powerful energy.

It's like you press a spring, the harder you press, the greater the spring's rebound force.If you press harder than the maximum capacity of the spring, the spring will be broken by you.

The engine is the same, although a higher compression ratio can obtain greater energy, but once the pressure exceeds the capacity of the engine, the engine will explode.

The engine manufactured by the Asian Machinery Factory does not seem to have this problem. Without installing a turbocharger, they have cleverly designed the interior of the cylinder and used the piston to complete the purpose of supercharging, thereby greatly improving the engine's performance. compression ratio.

Because of this, it can perform more powerfully in terms of power.

Another benefit of increasing the compression ratio is fuel savings.The higher compression ratio means that less fuel can be used to achieve the same power output, so this engine has such excellent fuel economy, saving [-]% in fuel consumption compared with similar products in Europe, this data Not bad.

This is a sixteen-cylinder diesel engine with the same displacement as many heavy tanks, so it is not an exaggeration to say that it is a gas tiger.A [-] percent fuel saving ratio is already quite impressive.

Kitano Shin looked at the structural diagram of the engine and didn't speak for a long time.

The technicians next to him looked at each other for a while, and then one of them whispered, "Director, what should we do next?"

Nobuo Kitano let out a cry of waking up from a dream. He hesitated for a while and handed the blueprint to the technician, telling him: "Go and calculate the compression ratio of this engine immediately. Calculate the temperature and pressure data that the piston needs to withstand under this compression ratio value, and the speed should be faster, understand?"

Several technicians nodded immediately, and took the drawings to the side to calculate the data.

Kitano Shin's face was a bit serious, he had already seen the excellence of this engine, as for how this engine achieved such excellence, it still needs to be calculated and tested to get the most accurate result. the result of.

The compression ratio of an engine is defined as the ratio of the volume of the cylinder when the piston is at its lowest end to the volume of the cylinder when the piston is at its uppermost end.

From a thermodynamic point of view, the higher the compression ratio, the better.However, in practical applications, the ratio of the compression ratio is limited.

The most important limitations come from three aspects. First, the mechanical strength will be limited by the maximum pressure and maximum temperature inside the engine block.For any engine, there is an upper limit for its casting materials. Once this upper limit is exceeded, the material will have problems.Reflected in reality, this engine will fail and cannot operate normally.

The third restriction comes from fuel, which is mainly aimed at gasoline engines. As for diesel engines, there is no such restriction.

The biggest difference between a gasoline engine and a diesel engine is that the former uses a spark plug to ignite the fuel for mechanical work.This is because the compression ratio of gasoline is relatively low. Once too high pressure is applied to them, they will explode before the spark plug ignites, which will seriously affect the normal operation of the engine and produce huge noise. In technical terms, this situation is called "gasoline knock".

In order to reduce the tendency of gasoline knocking, gasoline engines can only reduce the compression ratio, and different types of gasoline engines also have special requirements for the gasoline used.For example, some engines require car owners to fill in No. 97 gasoline, while others require No. 93 or No. 90 gasoline. This is because the chemical composition of different grades of gasoline is different, so the knock value of these gasolines is also different.

Generally speaking, the more advanced the vehicle, the higher the compression ratio of the engine used, so the higher the requirements for gasoline.This is why high-end cars generally use higher-grade gasoline, which costs more.

Diesel engines do not have spark plugs at all, because the compression ratio of diesel is very high, at least much higher than that of gasoline.That being the case, how does a diesel engine obtain kinetic energy through diesel?

The answer is simple: through strong compression, directly compress the diesel oil to self-deflagration.

Because of this, the compression ratio of diesel engines is higher than that of gasoline engines.

However, no matter how high the compression ratio is, there is a critical value. If this critical value is exceeded, the engine will not be able to bear it.The compression ratio of a diesel engine ranges from about 12 to 22, that is to say, the highest ratio is 22. Very few diesel engines exceed this ratio, and even if it exceeds, it is rarely exceeded.

As I said before, the higher the compression ratio, the higher the requirements for the cylinder material.In the case of high compression ratio, although a higher energy burst can be obtained from diesel, it will seriously damage the engine. Even if the engine does not explode, it will accelerate the wear of the engine and greatly reduce the service life of the engine.

(End of this chapter)