The engine is the source of power for the car, but also the core part of a car, the quality of the engine directly determines the power, price, stability and environmental protection of the car.
Man's first internal combustion engine car was invented in 1866 by the German Otto, which was a single-cylinder, horizontal, four-stroke reciprocating piston type internal combustion engine, using gas as fuel, with a power of only 2.21 kW, a speed of 180 R/min, and a thermal efficiency of only a pitiful 12% to 14%. Although the parameters of this engine are pitiful from the current point of view, it was undoubtedly a great progress at the time.
A cylinder is a mechanical device that converts the energy of compressed air into linear motion. In general, under the same cylinder diameter, the greater the number of cylinders, the larger the displacement, and the higher the power.
The common parameters such as "L4", "V6", "V8", "W12" and so on in the engine parameters column refer to the arrangement of engine cylinders and the number of cylinders.
At present, there are five main types of common cylinder arrangements, namely: L-type in-line, V-type arrangement, horizontal opposed engine, and W-type arrangement. Generally speaking, most of the engine cylinders below 5 cylinders are arranged in an in-line manner, that is, each cylinder is arranged side by side in an in-line line, and the piston works back and forth in it. The advantage of the in-line method is that the width is small, the structure is simple, and all cylinders share a cylinder head, which reduces the manufacturing cost and makes the later maintenance more convenient. Therefore, it is the most common arrangement on the daily market.
Engines with two rows of cylinders arranged at a V-angle are called V-engines, and the same is true for horizontal opposing arrangements and W-shaped arrangements, both of which are mostly used in luxury models because of their higher cost. For example, the Lamborghini Aventador uses a V12 engine.
Automobile engines can be divided into two types: natural suction and turbocharging according to different air intake methods.
Common car parameters in 1.5T, 2.0L and so on. The number part of it indicates the displacement of the car, in general, the larger the displacement, the energy released by the engine per unit time is large, the power is good, of course, the large displacement engine naturally means high fuel consumption. The letters at the back represent the intake method, with T for turbocharging and L for natural aspirate.
Compared with turbocharged engines, naturally aspirated engines are more technically mature, relatively stable, long life, low maintenance costs, smooth power output, and linear. The response to the throttle is faster, but it is more fuel-intensive than turbocharging, and the same displacement is less powerful than turbocharging. In low-pressure environments such as plateaus, the performance of naturally aspirated engines will also be greatly affected.
The large-displacement naturally aspirated engine is loved by many sports cars for its handling comfort and sound, such as the Lamborghini, the Porsche 911 with a displacement of 4.0, the Audi R8 with a displacement of 5.2, etc. all use naturally aspirated engines.
Turbocharging technology was introduced in 1905
Turbine engines increase the intake of air by compressing air. Usually, 1.5T turbo cars can be compared with 2.0L self-priming cars, which makes the noise generated by turbo cars with the same horsepower less, while the turbo engine has an advantage in increasing the speed to 3000 rpm, and the smooth acceleration increases the maximum speed limit for the turbo car.
However, the turbocharger device relies on the waste push generated by the engine, rather than synchronously running when the engine is just started, the engine has just started, and at low speed, the exhaust gas generated is not much, which is not enough to promote the operation of the turbine. This delay time from pressing the throttle to increasing the speed of the turbine to start is called turbo lag. Turbo lag causes a sense of delay when the turbocharged engine accelerates, and the power output is inconsistent and frustrated.
The service life of the turbocharger is shorter than that of the naturally aspirated engine, and the turbocharger life is shorter than that of the naturally aspirated engine, and the maintenance cost in the later period is much higher.
Most of the car buyers are used for urban driving, often run the high-speed situation is less, this situation equipped with a 1.5T engine of the family car is enough to meet your needs, if you buy a 2.0T engine model, will definitely obviously feel the increase in the cost of car maintenance, but the usual urban driving experience difference is no different. Personally, I think that for ordinary family cars, it is most suitable to carry a 1.5T engine.
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