The second stroke - compression. When the compression piston upward from the bottom dead center dead center, the stroke of the function there are two, one is to increase the air temperature, fuel combustion to prepare themselves: two to create conditions for gas expansion work. When the upstream piston marine engine, after the intake valve is closed, the air is compressed within the cylinder, with a small volume of the continuous, air pressure and temperature will continue to rise, and the degree of compression of the compression pressure and humidity of the air about the end, i.e. the compression ratio, generally pressure and compression end temperature: Pc = 4 ~ 8MPa, Tc = 750 ~ 950K. Diesel auto-ignition temperature of about 543-563K, the compression end temperature of spontaneous combustion higher temperature than diesel marine engine manufacturers a lot, enough to ensure the fuel injected into the cylinder of self-ignition combustion. Injected into the cylinder of a diesel marine engine sales, not immediately angry, and physical and chemical changes after only angry, this time there are about 0.001 to 0.005 seconds, called the ignition delay period. Therefore, to dead center before the start of the atomization of the fuel injected into the cylinder at 10 ~ 35 ° crank angle, and crank TDC after 5 ~ 10 ° when the combustion chamber reaches the maximum combustion pressure in the crank Go, forcing downward movement of the piston. Marine diesel structural advantages 1. Unique frame type main bearing structure, body stiffness, small vibration amplitude, low decibel. 2. A cylinder cover marine engines offer a convenient vehicle repair process, reduce maintenance costs consumption. 3. The main components are global purchased, to achieve a high engine configuration. The accessories are completed, air coolers, sea and fresh water heat exchanger mounted on the engine, easy cabin layout. 5. The diesel engine cooling systems inside and outside the two-cycle water-cooled, diesel engine with fresh water circulating cooling, the outer loop water by sea-fresh water heat exchanger for fresh water cooled diesel engine service life improved. Marine engines Sellers | Weifang Huadong (certified) | marine engines supplied by Weifang Huadong Engine Co. Weifang Huadong Engine Co., Ltd. (www.hdchai.com) is an industry leader in Shandong Weifang, the internal combustion engine, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Weifang Huadong leadership with the staff warmly welcome all inquiries negotiations to create a better future Weifang Huadong.