Here to highlight the Renault code pin role of the

Here to highlight the Renault code pin role of the shape of the top of the piston cylinder flow. The piston in the upper dead point position, the gap between the head surface of the piston and the cylinder head is called the combustion chamber, the volume of the combustion chamber is an important factor to determine engine performance. GDI piston raised portion of the top surface of the piston like the roof, also known as "bending the top surface, it reduces the volume of the combustion chamber, contribute to the formation of a strong eddy. Refine the combustion chamber volume is bound to increase the compression ratio, and therefore the GDI compression ratio of 12:1, about 1/3 higher than the conventional engine. Compression ratio improved cylinder temperature must also increase as contribute to the lean-burn. The compression ratio, Renault code pin the output power increases, so also compensate the power loss of the lean burn.

        Compression ratio means that the cylinder pressure to improve, in the complex is a high pressure fuel pump, and sent to the combustion chamber with high-pressure gasoline. However, the nature of the gasoline to determine the compression ratio can only be limited within certain limits, otherwise there will deflagration, in order to avoid this phenomenon, the GDI two-step injection process, the first step in the intake stroke injection gasoline to reduce the gas temperature, to adapt to the high compression ratio; second step set forth above in the compression stroke Autocom and post-injection gasoline formed layered mixed gas form. This is inter-related technologies, complementary and indispensable....

Automotive engine piston and piston rings BMW GT1 DIS V57

Piston engine is one of the main BMW GT1 DIS V57 components in the engine, piston group, with the cylinder head piston rings, piston pin parts together to form a combustion chamber to withstand the gas force and power to the crankshaft through the piston pin and connecting rodto complete the work of the internal combustion engine process.

As the piston is in a high-speed, high-pressure and high-temperature harsh working environment, but also taking into account the engine runs smooth and durable, thus requiring the piston must have enough strength and stiffness, good thermal conductivity, high heat resistance, expansion coefficient (changes in size and shape to be small), the relatively low density (light weight), the wear-and corrosion resistance, but also low cost.

More high, some BMW GT1 DIS V57 requirements contradict each other, it is difficult to find one able to fully meet the requirements of the piston material. Modern engine piston generally made ​​of aluminum alloy, because the aluminum alloy material has a low density, good thermal conductivity prominent advantages, but also that expansion coefficient is relatively large, relatively poor high temperature strength shortcomings, these shortcomings can only be reasonable structure design in order to meet the requirements. Therefore, the quality of the merits of a car engine, not only depends on the materials used, but also depends on the design of rationality.

General piston is cylindrical Autocom   body, according to the working conditions and requirements of the different engine piston constructor various general p