Chapter 1224: Spare tire

And he soon knew what the treasure in Zhang Baozhong's hand was!
Because he saw a model.
"This is a brand new engine that I am doing overall design." Zhang Baozhong pointed to this model and introduced: "Look, Mr. Tan, although this engine is somewhat similar to the 12150, it still uses a V-shaped 12-cylinder 60-degree clamp. The angular turbocharged and inter-cooled solution, but compared to the 12150, when the cylinder diameter is still 150 mm, the piston stroke is shortened, the cylinder center distance is increased, and the transmission is changed to rear, which is slightly sacrificed In the state of volume, compared with the 12150, it has obtained a larger power increase and leaves plenty of room for improvement in future upgrades, so I personally am very optimistic about this solution."
Tan Zhenhua nodded noncommitantly. He didn't understand these technical details very well, and he didn't understand the benefits of such a design. However, the last sentence Zhang Baozhong said caught his attention-I personally are very optimistic. For this plan, this is obviously something in the mouth.
But he believed that he would soon figure out what was hidden in this sentence.
Just listen to Zhang Baozhong continue to introduce: "You may have noticed Mr. Tan. In addition to the export of the "Storm 2" tank, we have also verified a number of technologies on it. What is the purpose? As you can guess, according to our tracking of the development trend of international tanks, the third-generation main battle tanks of the Western mainstream have better protective performance and larger artillery calibers, so their combat weight generally exceeds 50 tons or even Some are more than 60 tons. Under such a large tonnage, the maneuverability of the tank can actually rise without falling, indicating that its matching engine has made a huge improvement over the previous generation. According to existing intelligence, these third generations The power-to-weight ratio of tanks is basically around 20 kilowatts/ton. In this way, a tank with a combat weight of 50 tons will have an engine power of more than 1,000 kilowatts. Take the MB873Ka-50 engine on the Leopard II as For example, its power reached 1,103 kilowatts and 1,500 horsepower, which is almost double the power of 12,150. This poses a huge challenge for us."
"That's why we have the idea of ​​imitating MTU's 8V331TC41 engine, right?"
Zhang Baozhong nodded and said: "Yes, Mr. Tan, what you said is right. Although MTU's 8V331TC41 is only a civilian engine, it has a very good foundation, and even if it is a civilian model, we will install it in the test tank. After testing on the prototype car, the maneuverability of the prototype has improved compared with that of the 12150ZL. However, the average effective pressure of this MTU engine reached 1.754 MPa and the speed reached 2400 rpm. Its military prototype, That is, the speed of the MB873Ka-501 on the Leopard II tank has reached 3000 revolutions per minute! Mr. Tan, you may not understand this, but I can make a simple comparison. Our 12150 engine, The speed is only 2000 revolutions per minute, even the latest and most powerful model 12150ZL, the average effective pressure is only 0.83 MPa, less than half of others!"
Tan Zhenhua nodded again: "Gong Zhang, I probably understand what you mean. This means that the 12150 model has a significant generation difference with the international advanced level, plus what you said before, the development potential of this old engine Inadequate evaluation, so the development of a new power core is an urgent matter, right?"
Zhang Baozhong replied: "Yes, in fact this plan has been around since the late 1970s. One of the technological paths is the imitation of the 8V331TC41 that you already know. If it succeeds, you can continue to advance the evolution from 8 cylinders to 12 cylinders. In this way, a suitable engine can be obtained."
"The result of this technological path is that immature 8V165 engine, right?"
"Yes, but Mr. Tan, you should have heard it now? Our basic materials, heat treatment level, casting and machining level are all lagging behind that of West Hans, resulting in imitation products that cannot work at such a high effective average. Under pressure, even if the speed drops to 2400 rpm, it cannot work stably, so its power will be limited to 588 kilowatts. But even so, the reliability of its work cannot be guaranteed. This problem lies in the current basic industrial capabilities. The download is almost unsolvable, which is why I am opposed to continuing the 8V165 technical route."
Tan Zhenhua nodded again and thought for a while and asked: "Gong Zhang, according to my understanding, in the development of such key core products, China Huaxia often adopts the way of walking on two legs, imitating and self-developing to ensure the final The timing of the results, then I guess, this self-developed leg, is it the model you showed me?"
There was a flash of flush on Wang Baozhong’s face, as if there was something unspeakable, but soon his expression became decisive, and he bit his lip and said,
Mr. Tan, you’re right. While the 8V165 plan is developing, We at Huaxia also have a program that is almost synchronized. The program name is X150, but it is not this one."
"Uh, huh?"
Now that he had spoken, Zhang Baozhong decided not to conceal it any more. He introduced: "The X150 program started in 1978. The main undertaking unit for the development is not our 5070 Institute, but the Jinxi Diesel Engine Factory in the same city as ours. Mr. Tan, you It may not be clear that the Jinxi Diesel Engine Factory was one of the 156 industrial projects that Soviet Russia assisted China in the past. It is also the only designated enterprise that produces engines for China’s armored vehicles. In fact, the 12150 series diesel engine we are discussing is this enterprise. The scientific research strength of the leading products produced may not be weaker than that of our research institute. In the past, our research institute and Jinxi Diesel Engine Factory were close cooperation units. When the 12150ZL engine was built, the two parties cooperated very well. With the success of 12150ZL, but..."
When Wang Baozhong said this, he suddenly stopped talking, but he already understood very well what he meant. Tan Zhenhua, who knew China’s military enterprise system very well in his previous life, knew it without guessing. There must be a so-called
facility dispute
in the past. When eating national food in one pot, there is no fundamental conflict of interest between the research institute and the factory. Of course, they can work together in harmony, but now the whole country has begun to promote "efficiency assessment and independent accounting". Then naturally, who They all want to fight for more benefits for the unit.
This is not unique to the Ministry of Weapons Industry. The Ministry of Aviation Industry is the same. According to the news that he broke out from the Internet in his previous life, he was one of the teachers of the original time and space for the export of "J7". , Song Wenhua from the 3611 Institute and Tu Jidatu, the chief engineer of the Rongcheng Aircraft Manufacturing Factory, did not lose much...
"I understand the X150 program very well." Zhang Baozhong obviously did not intend to explain to Tan Zhenhua the origin of the complicated "facility dispute", but explained from another point: "The starting point of this program is to expand the 12150 engine. The power is improved by increasing the cylinder pressure and speed. Because the design of this program is relatively small compared to the prototype, there are many people who support it. The development and bench test of the first prototype were even completed in the second year of the proposal. The power has reached 706 kilowatts, and its performance has greatly improved compared to the prototype."
"706 kilowatts can be increased by 30% compared to 537 kilowatts of 12150ZL, which is not bad?" Tan Zhenhua said.
"It is of course good to just look at the paper parameters." Zhang Baozhong said: "But as you know, Mr. Tan, like the 8V165, the X150 also encountered insurmountable difficulties. In the subsequent continuous tests, the cylinder heads were constantly exposed. Many faults such as cracks, breakage of the auxiliary connecting rod pin and bearing bush ablation, and because X150 and 12150ZL are almost the same structure, they also inherit the inherent shortcomings of the 12150 series. According to my opinion, even if the above problems are overcome, in the future The space for development of the company is also very limited, and it is basically impossible to achieve the 1,103 kilowatt capacity corresponding to MB873Ka-501."
"So your 5070 institute has implemented this new diesel engine route, right?" Tan Zhenhua fully understood this time, Zhang Baozhong not only opposed 8V165, but also opposed the 8V165 spare tire plan X150, and this is probably not his opinion. , The entire 5070 Institute should have this kind of opinion. It must be said that there are factors of "factory disputes" based on personal interests, but there are also 5070 comprehensive considerations on the future China Diesel Engine technical route. They also introduced Your own competition plan should be the model in front of you.
Feelings, the baby in Zhang Baozhong's hands, is a spare tire!