Hello everyone, today we're going to talkWhat is a rear-mounted boxer engine? ？This is a topic of interest to many people, because the rear-mounted boxer engine is a special engine layout, which is not common in the automotive field, but has unique advantages and charm, and is the dream choice of many sports car enthusiasts. So, what is a rear-mounted boxer engine? What are its features, advantages and disadvantages? Today, I will give you a brief introduction.
First of all, let's clarify the definition of a rear-mounted horizontally opposed engine. The rear-mounted horizontally opposed engine refers to the cylinders of the engine are divided into two groups, with a 180-degree angle centered on the crankshaft, which are installed on the left and right sides of the body respectively, which resembles a horizontal placement, and the symmetrical layout of the two adjacent cylinders, hence the name horizontally opposed engine. The rear-mounted boxer engine is also known as the boxer engine because its piston movement is like a boxer's punch. The English abbreviation of rear-mounted boxer engine is H or B, e.g. H4 for four-cylinder boxer engine and B6 for six-cylinder boxer engine. The difference between a rear-mounted boxer engine and a front-mounted boxer engine is that a rear-mounted boxer engine mounts the engine behind the axle, whereas a front-mounted boxer engine mounts the engine in front of the axle. Rear-mounted boxer engines are represented by Porsche and Subaru, and some of their models use rear-mounted boxer engine layouts.
Secondly, let's take a look at the advantages of rear-mounted boxer engines. The rear-mounted boxer engine has the following advantages:
Smoothness: The piston movement of the rear-mounted horizontally opposed engine is opposite to the left and right, which can cancel the vibrations of the first and second orders, making the engine run more smoothly and reducing noise and wear. Low center of gravityThe cylinder of the rear horizontal opposed engine is horizontal, the center of gravity of the engine is extremely low, and the engine is installed behind the axle, which can reduce the center of gravity of the whole vehicle and improve the stability and handling of the vehicle. Heat dissipation: The cylinders of the rear-mounted horizontally opposed engine are arranged on both sides of the body, which is conducive to heat dissipation, can avoid the problem of overheating, and improve the life and efficiency of the engine. Space utilization: The flat engine body of the rear-mounted horizontally opposed engine body shortens the length of the engine, saves space, and provides more possibilities for interior space and trunk space. 
Finally, let's take a look at the disadvantages of rear-mounted boxer engines. Rear-mounted boxer engines have the following disadvantages:
High cost: The structure of the rear-mounted horizontally opposed engine is complex, difficult to manufacture, and requires more parts and processes, so the cost is relatively high, and it is not suitable for large-scale popularization. Difficult to repair: The cylinder heads of the rear-mounted horizontally opposed engine are arranged on both sides of the body, which is inconvenient for maintenance and requires more parts to be disassembled, and the engine is installed behind the axle, which is not conducive to inspection and maintenance. Eccentric grinding problems: The piston of the rear horizontally opposed engine is placed horizontally, which is affected by gravity, which is easy to cause insufficient lubrication of the upper part of the cylinder, resulting in the problem of cylinder eccentricity, affecting the performance and life of the engine. Scope of application: The placement of the rear-mounted horizontally opposed engine is mostly longitudinal, which is more suitable for rear-wheel drive or four-wheel drive models, but not for front-wheel drive models, so the application range is limited. 
The above is my brief introduction to what a rear-mounted horizontally opposed engine is, I hope it will be helpful to you. Of course, there are many other details and knowledge of rear-mounted horizontally opposed engines, if you want to know more, you can search for relevant information 12345 on the Internet, or pay attention to some professional ** and institutions. I am a ten-year car repair master, Lao Zhang repairs the car, we will see you next time! Engine