Why is a large displacement motorcycle more fuel-efficient than a car?

Start with the difference between the two rounds and the four rounds. As we all know, motorcycles and cars were born almost at the same time. Since its birth, cars have been destined to have more space than motorcycles, better stability and easier maneuverability. The handling of a car depends mainly on the chassis, while the motorcycle, more factors are the driver's technology, involving the constant shift of the driver's center of gravity. For example, the same car, the driver is cornering at a certain speed, changing to an ordinary person, the same speed is completely possible, and the motorcycle is completely impossible. The high speed cornering of the motorcycle requires the driver. Superb bending skills.

Therefore, the impact of weight on handling performance is much more pronounced on motorcycles than cars. The innate characteristics of motorcycles determine the route that motorcycles must take lighter. Compared with cars, the weight of a motorcycle's engine is undoubtedly much larger, so the engine of motorcycles is generally very compact. With lightweight requirements and space constraints, motorcycle engines seldom adopt energy-saving technologies that are widely used in modern internal combustion engines, such as variable timing for intake and exhaust.

As the saying goes, the car is iron-clad meat. The motorcycle is a meat-wrapped iron. The design of the iron-clad meat allows the car to make a regular shape and has a good drag coefficient. The motorcycle rides know that the wind is blowing properly. For high-speed vehicles, the biggest resistance is the power consumption from air resistance w=cv3 (w wind resistance power consumption, c wind resistance coefficient, v vehicle speed). Compared to cars, greater windage results in higher fuel consumption.

In summary, from the congenital gene, the first is that the motorcycle engine is small and compact, and the fuel-saving technology is rarely used; the second is that the drag coefficient is large, and a considerable part of the engine is given to the knight. Note that I am talking about not enough fuel-saving technology, the technical content of the motorcycle engine is still good, look at the high compression ratio. Let's take a look at the impact of the "August 18" engine design concept on fuel consumption.

The car is four-wheeled, the contact area is large, the two wheels of the motorcycle are on the ground, and the contact area with the ground is generally as large as an egg. Therefore, from the design point of view, Hyundai’s popular low-turning and high-twisting is not suitable for motorcycle. Of course, there is also a very strong torque, and the width of the rear wheel is also very strong.

Since the weight and volume of motorcycles have a great influence on the handling, a number of motorcycle manufacturers are pursuing smaller volumetric weight and greater power. The volumetric weight and power of the engine originally have a certain opposite relationship. In the case of constant displacement, there are two ways to increase power substantially: high speed or turbocharged. Because the high-torque motorcycle brought by turbocharging is difficult to hold, the high speed has become the common way of motorcycles nowadays, and it is 10,000 rpm. Therefore, in the design stage of large displacement motorcycle engines, fuel consumption is not a key requirement for product design for better performance. In the automotive industry, there is also a high-speed man, that is Honda's classic red-head machine.

As a generation of classics in the eyes of fans, the high speed and terrible power of the red-headed machine is the killer of killing the enemy. This is very similar to the design concept of the motorcycle engine (Honda motorcycle is also very cattle, it really is a high-speed man ). For high speeds, the red head machine, like the motorcycle engine, is designed with a small stroke. The stroke is the distance from the top dead center to the bottom dead center. The design of the large stroke brings longer burning time, larger longitudinal burning space and longer working stroke. Whether it is fuel-efficient or not, you can refer to the Atkinson cycle engine and the recently hot Mazda Chuangchi blue sky technology.

The short-stroke high-speed machine, the fuel consumption and the speed of the same as the four-seat, eight thousand turn red zone, nine thousand turns off the oil, which became the performance of the eye-catching artifacts, the garbage in the eyes of environmental protection fans, the red head machine has gradually faded out of sight . Let's look back at the motorcycle. The design of the trip is more exaggerated than the red head machine, and the engine speed is higher. Take the engine of BMW S1000rr as an example, the maximum horsepower is 193ps/13000rpm, which makes the car of 6,000-turn oil cuts discouraged. Gentle driving, cars can rarely get up to three thousand turns, and motorcycles, the speed of one thousand five is there? So don't look at it's small amount of food, eat less, eat less and eat more, add up to calculate, the amount of rice is really impressive.

To sum up, the fuel consumption of motorcycles is relatively high. The high wind resistance and compact structure result in the design concept of fuel-saving technology without space for punching and high-speed pressing power. In terms of people, the knight of the large displacement motorcycle is born with the gene of speed, the roar of the engine is even more exciting, do you like to enjoy the sorghum engine roar? Then just make a little more oil.

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