The time for the inspection of 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, it is exactly half a month.

You don't have to worry about Chen Geng about going abroad, socialism is good, as long as you hand over the corresponding materials to others, someone will naturally help you do everything properly, and you don't need Chen Geng to come forward for everything. 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 export of the Yangtze River 750 after he is busy with MTU, so what is Chen Geng doing now?

Chen Geng was with Jindeler at the moment, staring wide-eyed at an engine dismantled from the Yangtze River 750, this engine was fixed on a 1.5-meter iron frame, roaring heartbreaking, heart-rending like an 8-degree treble, holding back his face and thick 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 table clock on the table, and sighed with a disappointed face: "3 hours and 42 minutes, it still doesn't work." Not up to the mark. ”

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 great "progress": the first three engines maintained 4800 rpm for 58 minutes, 1 hour 39 minutes and 2 hours 07 minutes respectively. The fact that the fourth engine could sustain nearly four hours at a speed of 1.45 times more than the rated speed was somewhat unexpected by Chen Geng and Jindler. It's just that 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 this engine reach 5000 rpm, for which the two have done a lot of work, and even in order to simulate the engine running at this speed state must be in a high-speed state, the two also specially made a floor fan to blow the cylinder of the engine - this 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 of the law - but the result still makes Chen Geng a little disappointed.

Allow the engine to cool 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 disassembled.

"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 $2 billion in foreign exchange reserves, and it is too late for the country to desperately want to increase its foreign exchange reserves. Sell materials from Germany to make a suitable cylinder block? 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 recommend an alloy that is not expensive, resistant to high temperature and high pressure, and relatively easy to process and form.

Chen Geng also has this idea. Another question is: "How do I remove this cylinder?" Do you want to use a cutter? ”

The characteristics of metal are thermal expansion and cold contraction, and now the temperature of the cylinder is almost more than 200 degrees Celsius.

Kindler suggested, "Let's deal with the cylinder on the right first. The right cylinder doesn't have to get stuck, maybe when we finish 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 right cylinder was easily removed, but after the right cylinder was dismantled, the left cylinder was still the same 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 were dark: not only the cylinder was wrong, but also the connecting rod, and both connecting rods were problematic: the performance was cracked!

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. The pistons don't make sense, it's okay. ”

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.

Generally speaking, motorcycles, especially air-cooled motorcycle engines, have very demanding oil requirements, because motorcycle engines are highly simplified engines, and the oil used is not only responsible for lubrication. It also acts as lubricating and cooling oil for the transmission mechanism, but you think that's the end of it? In addition to lubrication and transmission cooling, motorcycle oil also takes on a part of the engine's cooling...... Motorcycle engine oil is equal to both engine oil, transmission oil, and heat dissipation medium.

However, the power system of the Yangtze River 750 is slightly different from that of a traditional motorcycle engine. Although it is also an air-cooled engine, the engine and gearbox are two separate systems, similar to the powertrain on the car, 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, let's be honest. Our domestic engine oil level is still a lot behind the world level, and what is worse is that our country's motorcycle industry is underdeveloped, and even the level of motorcycle special engine oil is very low.

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 contempt: "In the future, the Yangtze River 750 equipped with the improved engine will all be exported, and no one will pull the engine speed to more than 3000 rpm during the run-in period. We can also make some money on motor oil. ”

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

The 4S store does it, why can't I do it, buddy?

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

"The cylinder block had to be made of materials that were more resistant to high temperatures and pressures, the connecting rods had to be made of forged high-strength alloy steel, and the pistons seemed to be fine now, but to be on the safe side, they needed to be made of alloys 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 BMWR80G/S is very good-looking: "Now it seems that before the arrival of the Chengfa people, we can't continue 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.) )