"As far as the engine is concerned, at present, the German engine is the most mature, they have used a 1500 horsepower diesel engine on the Leopard-2 tank, which has been running stably for many years, whether it is the accumulated experience or the real test, their tank diesel engine, has withstood it." Qin Zhenhua said: "In our country, in the past few years, we have been aiming at German diesel engines, but unfortunately, our industrial base is not enough, so it is impossible to directly map and imitate." ”

"At the same time, for us, this diesel engine is not the most perfect, and one of its important drawbacks is that it is too large." If someone else says it, the engine experts around will be dismissive, you say that people have shortcomings, you are engaged in one!

Qin Zhenhua is now out of it, so he naturally has this confidence.

"They use a V-shaped 90-degree cylinder layout, which leads to a large volume, plus heat dissipation, the overall power package, almost close to four cubic meters, because the power system is large, so, the power compartment behind the tank is long, so that the tank has to gain a lot of weight, and our volume is only two cubic meters, saving half of the volume, the length of the entire power compartment, can also be shortened by about one meter, the weight of the tank, can save three or four tons."

The Leopard-2 tank is very long, so seven pairs of load-bearing wheels are used, and the length of the back is completely prepared for the engine, if the engine is short, the power compartment can be shortened, so that the tank's own weight can come down.

And it's not just something they came up with, that's what French experts said at that international conference in Israel.

Zhang Lao nodded: "Yes, what you said makes a lot of sense." ”

"At the same time, in order to achieve this power, the Germans used the way of increasing the speed, the speed came up, the heat came up, in order to dissipate heat, it was necessary to use a larger radiator, on the one hand, to make the volume of the engine larger, on the other hand, to consume more power, although the Leopard-2 has 1500 horsepower, however, there are more than 200 horsepower, which are wasted in heat dissipation."

It is the easiest way to increase the power by increasing the speed, but the consequences are also many, take the current situation, heat dissipation is a big problem, originally increased to 1,500 horsepower, as a result, the heat dissipation is consumed so much, in fact, it is still equivalent to a 1,200 horsepower engine.

If you buy BMW, you can find that BMW's engine data is very low, even much lower than the engine of some domestic cars, and some are even called turbo decompression because the power is too low.

But, so what? Really drive, or BMW's speed is fast, why?

Because many car companies, in order to make their engines look tall, they mark the test power on the bench, and even the power of heat dissipation is not counted, and BMW doesn't care about these data, what people mark is the real power transmitted to the wheels. In this way, there is a big gap.

The 1,500-horsepower engine of the Leopard-2 sounds very bullish, but in fact, it still has a lot of shortcomings.

It is estimated that Qin Zhenhua is the only one who dares to evaluate the world's most advanced tank engine like this.

Many of the engine experts present frowned when they listened, and some nodded in agreement.

"This actually also illustrates a problem, to achieve such a high power output, quite difficult, industrial power Germany, relying on the way to increase the speed, which has brought a lot of side effects, and the United States, is also an industrial power, but, bypassing this technical difficulty, directly take down the engine of the aircraft to use."

Americans, with gas turbines.

In this era, gas turbines are very beneficial, small parts, easy to start, not affected by the weather, small size, strong power, used in many aspects, such as warships, Britain began to implement all gas turbines.

Because the United States felt that it was not easy to get around the piston engine, it took the road of gas turbines, and this road was also going very fast, after all, their industrial base was there.

"They avoided the problem and came up with an engine with enough power, but the disadvantage of gas turbines is that they are too expensive." Qin Zhenhua said: "Not only is the purchase price high when equipped, but when it is used, it burns aviation fuel, which is not something that ordinary troops can afford, and the fuel consumption rate is several times that of ordinary tanks." ”

Gas turbines, in fact, can be used a variety of fuels, take marine gas turbines as an example, many times, burn the worst quality heavy oil, but, for tank engines, under normal circumstances, it is actually aviation fuel added.

Aviation fuel, that's all money, many times more expensive than diesel, when oil is refined, it is the best kind of oil.

"These are the two routes that have achieved fifteen hundred horsepower." Qin Zhenhua said as he walked: "There are also those that are being developed, such as the French, who use a hybrid scheme of turbine engine and piston engine. ”

It is not surprising that the French have this whimsy, they have always been wonderful, and now, they are going to learn from the strengths of others, and they have adopted this scheme, thinking that they have combined the advantages and disadvantages of the two.

Small size, strong power, and fuel efficient, but this way, complicated!

A good engine must be a simple engine, complex structure, which means that the failure rate increases, however, the technology of the French is not comparable to Germany and the United States, and if they want to achieve this power output, they can only take this road.

"Also, Japan on the other side." Qin Zhenhua said: "In order to fight the tanks of the Soviets, they are also developing the third generation of tanks, and the technical route they take is the two-stroke diesel engine scheme, which has advantages and disadvantages. ”

Normal vehicle engines are all four-stroke, the intake compression does the work exhaust, the piston goes back and forth twice, and the crankshaft rotates twice, that is, the engine turns twice and injects oil once, while the two-stroke diesel engine is completed in one circle, that is, at the same speed, it does the work twice, so that the power can be increased to twice as much.

In fact, due to various problems, that is, it reaches about 1.6 times, and because of this, the diesel engine of the two-stroke has twice the fuel consumption of the four-stroke.

It's like a motorcycle, 50, 60, fuel consumption is not low, to 70 motorcycles, but it has become a fuel-saving king, because 70 motorcycles are four-stroke. High displacement, high power, but also fuel efficient.

The Japanese are just a shortcut to get their power up as soon as possible, and in fact, it's not the most suitable.

Qin Zhenhua pointed out the country, passionate words, and said all the main technical routes in the world, and at this time, the engine test workshop has also arrived.

"So, what about our technical route?" Zhang Lao entered the gate, looked at the diesel engine from afar, and asked Qin Zhenhua.