Li Rujin carefully looked at the parts one by one, reached out and touched the cylinder, checked the finish of the cylinder wall, and carefully checked the cylinder wall to see if there was any sand hole, and the result was satisfactory. The pen "Fun" Pavilion www.biquge.info found no problems.

Li Rujin instructed the staff to assemble the engine and actually run it once, during the installation, Li Rujin opened his eyes wide and recorded each step, he knew that the mortise and tenon structure was specially designed to install the order, even if it was a wrong step, the next steps could not be continued.

The installation process takes a bit more time, which is expected by Li Rujin, the surface of the metal parts is smooth, but due to the small gap in the joint of the parts, it must be tightly fitted, the installation must be troublesome, and the time spent must be more.

In addition, metal is not as tough as wood products, and sometimes a small part has to be installed repeatedly how many times to get in place. The lengthening of the installation time also gave Li Rujin the opportunity to steal the teacher, and the whole installation process made Li Rujin write it down without any stretch.

With the last iron bar installed in place, the engine finally returned to its original state, Li Rujin looked at the time, it took more than forty minutes in total, and it was still very fast. The staff also found external facilities, such as fuel tanks, oil tanks, starting power supplies, etc., and connected them one by one.

After all the preparations are completed, the staff gives electricity to the flywheel, the flywheel begins to rotate, the piston begins to reciprocate, the fuel begins to supply the engine along the oil circuit, and the engine starts smoothly with the black smoke coming out of the exhaust port!

Because it is indoors, the noise of the engine is relatively loud, but the engine can run normally, which has given Li Rujin a huge surprise, you must know that this is a subversive engine, and its birth has the significance of mileage.

Although he did not change the working principle of the engine, he changed the mechanism of the engine body, and replaced the fixing screws with a tenon structure, which is stronger and more reliable than the screw fixing and locking.

This puts more pressure on the cylinder, and being able to withstand more pressure means that the turbocharger will work better and have more horsepower.

At this time, the engine has not yet turned on the supercharger, the engine runs briskly and smoothly, and the noise is much less. Li Rujin motioned to the staff to turn on the pressurization device, and the staff said with some embarrassment: "Turn on the pressurization device, this vibration is too strong, we are ..... on the second floor."

Li Rujin instantly understood what the staff meant, an iron guy weighing more than a ton shook on the second floor, and it didn't take long for the floor to collapse, but he ignored it because he was too excited.

"Is there an engine downstairs?"

"Yes, yes, yes is the same as this one, it is also produced after it is finalized, it was produced earlier than this engine, and it has been run-in" Li Rujin nodded, but his heart was turbulent again.

Just now, the engine was a little noisy when it started, but after normal operation, the noise was within the acceptable range, at least it didn't sound so harsh, and then after opening the window, the noise was a little weaker. The regular sound of the engine "suddenly, suddenly, suddenly" has a somewhat pleasant feeling.

What kind of surprise will a run-in engine give him in terms of noise now? There is still a big difference between the run-in engine and the non-run-in engine in terms of noise.

Li Rujin came down with the staff, out of the small building, and came to a bungalow in the backyard, and the staff explained: "Because the noise of the engine is relatively loud when it is working, it is easy to affect others, so the engine test is here."

The staff said as he opened the door of a room and led Li Rujin into the inner room. As soon as he entered the door, Li Rujin smelled a strong smell of oil smoke, and the staff was a little embarrassed to explain to Li Rujin, Li Rujin waved his hand, this is an engine laboratory, if there is no smell of oil smoke, it would be strange.

The whole room was empty, and there were two engines on the ground that had been fixed, and the external facilities were connected and could be started directly. In one corner of the room, there is a rack for parts with various parts and tools.

The staff pointed to an engine and explained to Li Rujin: "This one is a prototype, and it is now damaged. “

When Li Rujin heard that it was a prototype, he immediately became interested, walked forward, and carefully looked at this prototype that brought about engine changes.

The crew walked over to the other engine and began to check it before it started.

Soon, the staff signaled to Li Rujin that the engine could be started, Li Rujin nodded in agreement, the staff pressed the button, and the engine ran briskly, the sound was crisp and neat, without a dull feeling, this voice, Li Rujin sounded extremely pleasant.

And the vibration is also extremely weak, based on these two points alone, Li Rujin can judge that even if there is no supercharging device, this is an extremely excellent engine.

After a period of warm-up, the various parts of the engine have been fully lubricated and the supercharger can be turned on.

The staff motioned to Li Rujin that he was going to turn on the pressurization device. Li Rujin nodded.

The staff rotated the button, the booster device started, after about a second of lag, the speed of the engine rose rapidly, the surging power almost rushed out of the engine, head-on, as the staff continued to increase the oil supply, this feeling became stronger and stronger, almost let Li Rujin have a feeling of suffocation, that feeling, exciting and exciting.

With the increase of oil supply, the speed of the engine is also increasing rapidly, and the vibration of the engine is getting bigger and bigger. The noise also became intense, like tiny steel needles, constantly stimulating Li Rujin's eardrums.

Li Rujin signaled the staff to turn off the supercharger and let the engine enter a non-supercharged working state. The staff lowered the engine speed and turned off the booster when the temperature of the booster had cooled.

It took a while for the engine to run before the crew turned it off completely. Now Li Rujin can already be sure that this engine is an extremely good or even perfect engine, at least now Li Rujin can't find out what its shortcomings are.

High horsepower, small size, and light weight, what are the shortcomings? Moreover, the structure of this engine subverts the body structure of the previous engine, and then continue to study and dig deep on the tenon structure, maybe there are more surprises waiting for Li Rujin.

In addition to the damn noise, now in addition to the way of physical isolation, there is no other way to reduce the noise of the engine, the noise of the diesel engine is mainly generated in the engine operation of the rapid combustion stage, due to the rapid increase in cylinder pressure, the diesel engine related parts are subjected to a certain strength of dynamic load, its nature is equivalent to a kind of percussion, directly affecting the vibration and noise of the diesel engine.

Therefore, the combustion noise of diesel engines is unavoidable, and it is impossible to essentially reduce the noise of the engine, and there is no solution for the time being. Only by means of external forces, such as physical isolation.