Niu Shilong had a victorious posture on his face, looking at Qin Zhenhua's side from time to time, Ma Panshan and Zhou Xuejun also came over, they had always maintained a normal meeting posture, and turned a blind eye to Niu Shilong's ostentatious expression.

Niu Shilong finally became the leader, and at this important meeting, their coal provincial diesel engine factory was in the limelight, and it can even be said that this meeting was mainly for them.

Now, everyone is listening carefully to the design of their tank engines.

Finally, their debriefing ended, and Minister Zhu continued: "You can now put forward some views on these two plans. Well, who came first? ”

At such times, there will be a short silence, after all, this kind of comment must be fair and objective, not selfish, and it must be made clear that this is a major event that determines the development of the domestic tank industry.

The old experts were still thinking about it at this time, but Qin Zhenhua raised his hand: "Leaders, I have an opinion, can you say it?" ”

"You? Do you know the engine? Niu Shilong couldn't help muttering beside him, isn't it just because of your Lao Tzu's relationship, there is just a small improvement in the armor-piercing bullet, the engine is different from the armor-piercing bullet, there are countless parts in it, can you understand?

However, this kind of thing can only be whispered, after all, as long as you can participate in this meeting, you are qualified to speak and judge.

"Oh, Xiao Qin, let's talk about it." Minister Zhu saw that it was Qin Zhenhua with a smile on his face, although Qin Zhenhua was young and not qualified enough to convince the public, but in recent times, he has made surprising achievements one by one, not to mention anything else, just take the introduction of L7 tank guns as an example, he is the first credit.

"Well, then I'll be offended." Qin Zhenhua stood up, and when he said this, he obviously wanted to find shortcomings.

"First of all, let's talk about our X150 engine, this engine, for now, should have the possibility of successful development." Qin Zhenhua began to comment.

Isn't this nonsense? Niu Shilong scolded secretly there, you kid, this is an open and honest thorn? Well, if you want to pick a thorn, that's not going to bother us, our technology is the most advanced.

"This engine makes the greatest use of the body of our existing 12150L engine, which can reduce the risk of research and development, and can also be more convenient to modify existing vehicles. However, it is precisely because of this that it inherits the problems of 12150L long stroke, small cylinder core distance, and weak body, so it can be said that the power improvement potential of the X150 is very limited. Qin Zhenhua said: "It is not easy for it to reach 700 kilowatts, and if it wants to continue to progress, I am afraid it will be even more difficult, and what about our future tanks?" At least 883 kilowatts, which is 1200 horsepower, are also needed, and I think that if you go this route, you will be at a dead end. ”

"Smack." In this kind of meeting, it is said that Niu Shilong should restrain the style of that kind of leader, there are too many leaders who are bigger than him, so when he slaps the case, he slaps his palm on the table, and then he feels that something is wrong.

"I'm sorry, leaders, I didn't control my emotions." He hurriedly apologized to the leader, and then said: "However, Qin Zhenhua is also too deceitful, and it is useless to belittle our R&D, Qin Zhenhua, what are your intentions?" ”

Of course, Niu Shilong was angry.

He is waiting for everyone to praise him, he has proposed two plans, one must be able to satisfy the leader, and even two can satisfy the leader, who knows, just after speaking, Qin Zhenhua, who was the first to speak, poured cold water on them, saying that their plan was a dead end.

If it was an old expert and a famous scholar who spoke, he could still accept it, but it was Qin Zhenhua who spoke, how could he accept it!

In fact, even in this kind of meeting, various units for their own interests, quarrels with each other, it is possible, after all, we have a famous saying, that is, the truth is refuted, everyone expresses their opinions, it is all right, but, you are a stinky apprentice, what qualifications do you have to say that our engine has a problem?

Faced with this question, the corners of Qin Zhenhua's mouth carried a hint of an imperceptible sneer: "Director Niu, I just said that the stroke is long, the distance between the cylinder center is small, and the body is weak, do you know what this means?" ”

"What do I care about you..."When he said this, Niu Shilong suddenly stopped, he had already understood, at this level of meeting, this Qin Zhenhua deliberately provoked himself to speak, just to expose the defect that he didn't understand technology. is still the leader of a promising factory, this errand is afraid that it will be yellow.

"Well, you can tell me about it." Niu Shilong skillfully kicked the ball back, I don't understand, but everyone present understands, you can talk about it, let everyone see your level.

Qin Zhenhua is waiting for this sentence to explain it to everyone.

"We knew that there were two ways to increase the power of the engine." Qin Zhenhua said: "On the one hand, it is to increase the efficiency of a single cylinder, the higher the combustion efficiency, the larger the cylinder volume, the more power, on the other hand, it is to increase the speed, when we can not increase the power of a single cylinder, we can increase the speed." ”

Niu Shilong carefully paid attention to everyone's reactions, and found that even Zhang Baolin was listening carefully there, it seemed that what Qin Zhenhua said was okay?

"And our existing engine, due to the inherent limitations, the speed cannot be increased. The original body of 12150L determines the long distance of the piston up and down, so that once the speed comes up, the inertia of reciprocating motion is greater, so the maximum speed of the engine, that is, about 2200 rpm per minute, and then look at the German Leopard-2 tank diesel engine, increase the speed to 2800 rpm, before reaching 1500 horsepower. Qin Zhenhua said: "This is the problem caused by a long trip. ”

"Let's talk about the cylinder core distance, this is the heavy distance of two adjacent cylinders, 12150L cylinder core distance to the cylinder bore ratio of 1.17, this ratio is almost unique in the same kind of engine, although this design can meet the engine length is small, small size, high unit volume power, light weight and a series of advantages, but the disadvantages are also quite numerous."

Qin Zhenhua gushed endlessly and explained to everyone, because this distance is small, so the length of the main journal and the connecting rod journal of the crankshaft is shorter, and the thickness of the crank arm is smaller, which increases the bearing load on the one hand, and makes the stiffness and strength of the crankshaft poor on the other hand.

Because this distance is small, the thickness of the crankcase diaphragm is also small, so that the demeanor of the crankcase is poor.

As for the biggest problem, it is still the reduction of this distance, resulting in a small flow area of the cooling water channel in the cylinder body, which affects the cooling of the cylinder, and the rigidity of the cylinder block is poor.

The gas wall thickness is thin, the stiffness is insufficient, it is easy to deform, and even because of the insufficient stiffness of the cylinder liner, it is easy to produce high-frequency vibration when working, this diesel engine, if you barely let it rise to 1500 rpm, it will produce terrible resonance, becoming a constraint on performance improvement.

Qin Zhenhua did not show a half-understanding, but the head of the way, and analyzed all kinds of problems very thoroughly, everyone present agreed with Qin Zhenhua's opinions, and even Zhang Baolin couldn't say anything against it for a while.

"As far as I know, the existing diesel engine will burst the cylinder head in the development process, and if the power continues to increase, it will reach 700 kilowatts." Qin Zhenhua said: "When the time comes, bursting the cylinder head is likely to be an unsolvable problem. ”