The time for the visit to the German MTU company has finally been determined, and the date is from October 30th to November 16th, excluding the time on the way back and forth, which is exactly half a month.

You don't have to worry about Chen Geng to go through the formalities of going abroad, socialism is good at this, as long as you hand over the corresponding materials to others, someone will naturally help you do it properly, and you don't need Chen Geng to come forward. Compared with the rest of the entire delegation, Chen Geng's visa is valid for up to 2 months, the reason is naturally that Chen Geng is busy with the Yangtze River 750 export after he is busy with the MTU thing, so what is Chen Geng doing now?

Chen Geng was with Jindeler at the moment, staring at an engine dismantled from the Yangtze River 750 with wide eyes, this engine was fixed on a 1.5-meter iron frame, roaring heartbreaking, heart-rending Cheng dù was like a high-pitched 8 degrees, holding back his face and neck...... Yes, seeing this, many friends should be able to think about what this is doing, this is doing some kind of engine test.

The almost hoarse roar of the engine indicates that the engine is running at a fairly high speed at the moment, and the front section of the reddish exhaust pipe that has burned indicates that the engine has been running at a very high speed for a long time, and then look at the number on a tachometer temporarily connected next to it: 4800 rpm, and the maximum rated speed of this engine is only 3300 rpm.

Even though the engine was running at 1.5 times the rated speed, neither Chen Geng nor Jindeler had any intention of stopping the engine until ......

"Bang"

Without warning, there was a loud bang, followed by the sound of clattering metal and a puff of smoke, and the engine shuddering and trembling stopped.

Chen Geng turned his head to look at the clock on the table, and sighed with a disappointed face: "3 hours and 42 minutes, it still doesn't work, it can't meet the requirements." ”

Jindler also looked disappointed: "Let's tear it down." ”

Speaking of which, this is already the fourth Yangtze River 750 engine that has been "broken" by Chen Geng and Jindler, but compared with the previous three, this engine that has just been "broken" has actually made huge "progress": the first three engines maintained 4800 rpm for 58 minutes, 1 hour 39 minutes and 2 hours 07 minutes respectively. The fourth engine can be maintained for nearly 4 hours at a speed of more than 1.45 times the rated speed, which is actually somewhat unexpected by Chen Geng and Jindler, but the two are still not satisfied, the reason is very simple. The first stage of the transformation of the Yangtze River 750 engine is to make the maximum rated speed of the engine reach 5000 rpm, for which the two have done a lot of work, and even in order to simulate that the engine must be in a high-speed driving state when running at this speed, the two also specially made a floor fan to blow on the cylinder of the engine, which is rarely used in the engine bench test, but considering that this engine is an air-cooled engine. Without a circulating liquid cooling system, this is not a violation, but the result still makes Chen Geng a little disappointed.

After the engine cooled down slightly, the two worked together, ready to disassemble the engine and analyze the reason, but when disassembling the left middle cylinder, the two encountered difficulties: the middle cylinder could not be removed.

"The cylinder is deformed," after a careful observation, Chen Geng smacked his lips, a little depressed: "The performance of the cylinder material is still poor in terms of high temperature and high pressure resistance, and now 4800 rpm is like this, if it is 5000 rpm, it can last for 2 hours." ”

"Simple. Germany has the right material ......"

"Don't even think about it! Our country now only has more than 20 billion US dollars in foreign exchange reserves, and it is too late for the country to desperately want to increase its foreign exchange reserves. It is simply impossible to approve it above. Chen Geng directly and unceremoniously broke Jindler's small abacus.

Since there is no way to import suitable cylinder block materials from Germany, the only way is to wait for the engineers and designers of Chengdu Aero Engine Factory to come, and recommend an alloy that is not expensive, resistant to high temperature and high pressure, and relatively easy to process and form among the metal materials they have mastered.

Chen Geng also had this idea, and there was another question: "How to remove this cylinder?" Do you want to use a cutter? ”

The characteristics of metal are thermal expansion and contraction, and the temperature of the cylinder is almost 200 degrees Celsius. Chen Geng and Jindeler also need to wear heat-insulating gloves when they just disassemble this engine, and if the cylinder block is cooler after a while, it is estimated that there is no way to disassemble it.

"Let's deal with the right cylinder first, the right cylinder won't necessarily get stuck. Maybe when we're done dismantling the right one, the left one will be removed? ”

Under normal circumstances, this situation is indeed possible, but unfortunately, this time Chen Geng and the two did not encounter such a good thing, although the middle cylinder on the right was easily removed, but after the right cylinder was dismantled. The left cylinder is still the same "stubborn" as just now.

Faced with this engine that refused to break away from the fuselage, Kindler had no move: "Cut, it seems that you can only get on the cutting machine......"

Actually, Kindler really didn't want to treat it in such a rough way, the problem was that the left cylinder didn't give face.

With the flying sparks of the gas cutting machine, the middle cylinder on the left side was finally removed.

It's just that after Chen Geng and Jindler restored the engine to a parts state, and after carefully inspecting each part, their faces turned black: not only the cylinder had a problem, but also the connecting rod, and there was a problem with both connecting rods: there was a crack in the table!

The occurrence of cracks means that the connecting rod may be broken at any time, which means that not only the cylinder block material is not qualified, but even the connecting rod material is also unqualified, which cannot meet the strength requirements of the engine when running at high speed for a long time.

However, compared with the cylinder block, Chen Geng is quite optimistic about the problem of the connecting rod: "The connecting rod is easy to do, the current connecting rod uses the casting process, and we should have no problem with higher strength forging, but Lao Jin, are you sure that there is no problem with the piston?" There is a problem with the cylinder block and connecting rod, and the piston is unreasonable. ”

Kindler affirmed: "I'm pretty sure there's nothing wrong with the piston, but I don't think this oil will be able to be used in the future." ”

Oil? Chen Geng took a closer look: Hey! It's not that it can't be used, even the color isn't quite right.

In general, motorcycles, especially air-cooled motorcycle engines, have very demanding oil requirements. Because a motorcycle engine is a highly simplified engine, the oil used not only serves as a basic duty for lubrication, but also as a lubrication and cooling oil for the transmission mechanism, but do you think that's the end of it? It's still early. In addition to lubrication and transmission cooling, motorcycle oil also takes care of a part of the engine's cooling...... Motorcycle engine oil is equivalent to engine oil, transmission oil, and heat dissipation medium, which wears three hats. In comparison, car engine oil is much happier.

However, the power system of the Yangtze River 750 is slightly different from the traditional motorcycle engine, although it is also an air-cooled engine, but the engine and gearbox are two separate systems, and the powertrain on the car is almost the same, the engine is the engine, the gearbox is the gearbox, each has its own special oil, Kindler said that the oil that has been denatured at high temperature is the engine oil of the engine.

The engine oil used on the Yangtze River 750 is domestic mineral oil. And the quality is quite inferior, to tell the truth, our domestic oil level is still a lot behind the world level, more terrible because our country's motorcycle industry is underdeveloped, even with the level of motorcycle oil is also very low, the country is now almost impossible to buy more advanced motorcycle semi-synthetic and fully synthetic oil, all of them are mineral oil.

This is going to be a dead end, do you still have to import engine oil from abroad?

"You don't know what to do with such a simple question?" But for Chen Geng's worries, Jindeler replied with full disdain: "In the future, all the Yangtze River 750s equipped with improved engines will be exported, and no one will pull the engine speed above 3,000 rpm during the run-in period." When it comes to the first warranty, it is recommended that users choose semi-synthetic or higher-grade fully synthetic motor oil, isn't it enough? We can also make some money on motor oil. ”

...... "Okay, Chen Geng is convinced, this guy deserves to be from a capitalist country, and his brain is the light." A slight turn is a money-making idea. But also, which dealer and 4S store does not make money by buying engine oil and maintenance, such as a barrel of 4 liters of gray Shell engine oil, in the milk tea sister and his husband's house as long as less than 300, but in the 4S store people dare to ask you for 588!

4S shop does. Dude, why can't I do it?

After some busyness and statistics, the general direction of improvement of this engine in the future came out......

"The cylinder block must be made of materials that are more resistant to high temperature and high pressure, the connecting rod must be made of forged high-strength alloy steel, and the piston seems to be fine now, but for the sake of safety, it is necessary to use an alloy with better performance......

After reading through the future improvement directions one by one, Chen Geng confirmed to Jindler: "That's basically it, right? ”

"That's basically it, oh, yes, and the overall shape of the shell, especially the shape of the cylinder," Kindler couldn't help but shudder when talking about the shape of the cylinder, and quickly drew a cross on his chest: "God, the current structure must be replaced, the design of this heat sink is too ugly!" ”

"That's right! Be sure to replace it! Chen Geng nodded heavily, he also felt that the design of the Yangtze River 750's current cylinder block and cylinder head was simply ugly: we have been producing for so many years, didn't you Xiangjiang Engine Factory think about improving the overall shape of the cylinder block and cylinder head? The shape of the cylinder block and cylinder head of the BMW wg/s is very good-looking: "Now it seems that before the arrival of Chengfa, we can't continue to the next step of Yajiu, why don't we go over and see how our car is modified?" ”

"Okay." Kindler nodded immediately.

……………………

When Chen Geng and Jindeler tossed the engine of the Yangtze River 750, the soldiers of the entire automobile company sent by the military region were not idle, and the work of inspecting and modifying the 15 Yangtze River 750s was handed over to them, in addition to conducting a comprehensive and thorough inspection of the 15 Yangtze River 750 side three-wheeled motorcycles and replacing all the problematic parts to ensure performance, they also had to modify them according to the requirements of the previous 15 customers who had paid the full amount...... This job is actually the simplest, with the Yangtze River 750 that now belongs to the old Comrade Jindler as a model, everyone is compared to the gourd to draw a scoop.

When Chen Geng and Jindeler came over, it was just in time for Chen Shengguo to be on duty today, and after knowing the intention of the two, he said: "I was about to tell you about this, all the cars have been modified, when can we pack them?" ”

"Did you say hello to customs?" Chen Geng asked.

"Say hello," Chen Shengguo nodded: "Just tell them when the time comes, the customs will directly send someone to the scene to assist us in handling the relevant procedures, and ensure that the affairs of the military region will not be delayed," After speaking, he said proudly: "They can't afford to delay!" ”

The army is this good, under an order, even the customs have to cooperate obediently, Chen Geng nodded with satisfaction: "Then I will rest assured, in about 10 days, I will pack and ship before leaving." ”

Chen Shengguo didn't ask Chen Geng why he made such an arrangement, the order he got from the superior leader was that he would do whatever Chen Geng said, and now when he heard Chen Geng say this, he immediately said: "Okay, I'll inform you again when the time comes." ”

"Then I'll trouble you," Chen Geng thought for a while, and then said: "By the way, there is another thing, the comrades who will be sent will arrive in a few days, can you do me a favor Company Commander Chen?" ”

"You say."

"That's right, the housing in our unit is a little tight, and we can still pay attention to it now, and it will not be enough to ask for people to come later, so can you ask the construction office to help us build a few houses?" Chen Geng was a little embarrassed.

"What should I do, it turned out to be such a trivial matter," after listening to Chen Geng, Chen Shengguo immediately smiled: "It's just a few houses, it's a trivial matter, I'll go back to the military region and report to the leaders, it is estimated that people will come over in three days at most, but Manager Chen, since your unit has money, why don't you build two buildings?" ”

"Build a building?" Chen Geng was a little dumbfounded: he had never thought about this problem.

"That's right, build a building." Chen Shengguo was a little surprised by Chen Geng's reaction: "When you have money, isn't the first thing everyone does to build a building?" (To be continued.) For mobile phone users, please visit wènhttp://mnet

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