The car giant started by marrying the daughter of the king

Chapter 50: Attack the Heart of the Engine

"Our BJ212 was originally designed to meet the needs of the military. It can be considered a military vehicle, which is consistent with the research direction of the Vehicle Engineering Department of your Capital Institute of Technology."

"This time the two units have joined forces, and I think this kind of cooperation is worth promoting."

Zheng Haiming and Zhu Jiansheng exchanged greetings for a while, and also talked with Dai Fuquan and other professors and assistant professors for a while, and then left the clay model making room with satisfaction.

The exterior design plan developed by Jiang Hui has officially passed the first round of evaluation within the Capital Automobile Manufacturing Plant.

Next, you can start preparing to make a 1:1 clay model.

However, just as Jiang Hui was discussing the production of the clay model with Chen Chenxing, Dai Fuquan and others, a team led by Chief Engineer Cheng Tao from the Capital Internal Combustion Engine Factory came to discuss the engine upgrade with Zhu Jiansheng and Jiang Hui.

During a previous meeting, Jiang Hui said that he had some ideas on how to increase engine power and reduce fuel consumption, but he had never had the time to communicate with people at Shuuchi.

Cheng Tao and his colleagues also want to try harder to see if they can solve this problem within their own factory.

However, in the end, the people in the Shounai Design Department had no idea at all, so they had to choose to find Zhu Jiansheng and Jiang Hui.

"Professor Zhu, Liaison Jiang, this time we are asking you for help."

Cheng Tao was humble, after all, he came here to ask for help today.

"You're too polite, Chief Engineer Cheng. I've been busy these days. I was planning to visit your factory and learn a little."

Jiang Hui's words were not entirely polite.

Although the engines currently produced by Shuuchi are not very advanced, it would be a problem if we don't go to the site to take a look and then some of the modified parts may not be produced by the other party.

When engineers from various car companies in later generations designed parts, they rarely considered whether the parts could not be made, but only considered whether the performance met the requirements.

But in China in 1978, many auto parts could not be produced domestically.

The most obvious one is the ECU (engine control unit) used in electronic fuel injection engines. This is mainly produced by several auto parts giants in the world, such as Bosch, Denso, and Hitachi. There is no supporting factory in China that can produce ECU.

At least in the short term, even if Jiang Hui designed the electronic fuel injection engine, he would not be able to produce it.

In this way, the engine used by BJ212 after the upgrade must still be a carburetor engine.

"I heard that you have already designed the appearance of the modified model."

"The Capital Automobile Accessories Factory has clear development ideas for many parts."

"Not to mention the Capital Gear Factory, their 4MT has already started preparing samples."

"But we still don't have any ideas on how to improve our engines. I'm worried about that."

Cheng Tao's words were not just politeness, he was really worried.

When the Capital Internal Combustion Engine Factory produced engines, it simply produced according to other people's drawings and did not have its own development capabilities.

Now asking them to develop a new generation of engines, isn't that asking for their lives?

"Xiao Jiang, didn't you have some ideas about increasing engine power and reducing fuel consumption?"

"It just so happens that Chief Engineer Cheng and his team are here today, so let's have a good exchange."

Zhu Jiansheng also hopes that this project can become more successful, which will be very beneficial to both him and Jiang Hui.

Strictly speaking, China has not yet truly completed a passenger car of independent design.

Even the previous "Dongfanghong" and "Jinggangshan" sedans had some innovations in the body.

The engine and gearbox still use the technology of Polar Bear. Now we are going to start working on the most critical component of the engine, which is naturally worthy of attention.

Cheng Tao and his team also came prepared, bringing with them the assembly drawings of the BJ212's current engine and some key components.

There is a huge pile of letters, it seems that he is planning to have a good talk with Jiang Hui today.

"To upgrade the engine, we must first start with the carburetor."

Since they came to communicate with sincerity, the project team does hope that the engine upgrade can be completed as soon as possible.

Jiang Hui certainly didn't play it safe. After a few simple greetings, he started to state his views directly.

The carburetor is something that people in later generations find unfamiliar.

But now it is an indispensable part of the engine, and its important role in the engine can be called the "heart" of the engine.

The functions of the carburetor are implemented, including starting device, idle device, medium load device, full load device, and acceleration device.

Any problem in any place will affect the performance of the engine.

"The dual-chamber carburetors we are using now were developed by Polar Bear in the 1950s, and are significantly behind the world's mainstream level."

"We want to increase power and reduce fuel consumption, and the first step is to redesign a carburetor."

As Jiang Hui spoke, he walked to the blackboard, picked up a piece of chalk, and began to draw quickly.

"When I was in college, I studied this problem and tried to design a four-chamber carburetor..."

Cheng Tao and his team may not be very familiar with other parts, but they must know the most important part of the engine, the carburetor.

So as soon as Jiang Hui started explaining, they listened immediately.

It is difficult for laymen to appreciate the beauty of this kind of professional component design, but experts can grasp the key points immediately.

Just like when Jiang Hui went to the Capital Auto Parts Factory and designed a maintenance-free integrated wheel hub bearing for them, Tang Riyue and other experts were immediately conquered.

The same is true for the carburetor.

After listening carefully to Jiang Hui's introduction for more than half an hour, I finally had a preliminary understanding of the structure and working principle of this new carburetor as well as the precautions in the processing and production process.

"Jiang Lianluo, this carburetor has a larger throttle valve. Although it can increase the power of the engine, will it lead to an increase in fuel consumption?"

Although Cheng Tao has felt the evolution of this carburetor, he has not figured out some of its shortcomings.

“This problem is mainly solved by adopting a multiple-pipe approach.”

"If the throat is large, the amount of air can be increased, but the gasoline atomization is poor; if the throat is small, the gasoline atomization is better, but the amount of air is reduced."

"Multiple pipes are made by placing several pipes of different diameters in a sequence of overlapping pipes with smaller ones on top and larger ones on the bottom."

"The main nozzle outlet is located in the smallest throat. When the air flows through, the air velocity in the small throat is large, and the throat vacuum generated is high, so the gasoline is better atomized, which is beneficial to improving fuel economy."

"The annular passage between the large throat and the small throat ensures that the carburetor has enough air volume to meet the power requirements."

"In addition, when multiple throats are used, the gasoline sprayed from the main nozzle undergoes multiple atomization in two or three throats, thus better ensuring the quality of the resulting mixed gas."

As Jiang Hui was speaking, Cheng Tao and others were desperately recording.

This opportunity to explain component design directly from the principle is very rare.

(End of this chapter)