The second stroke - compression. When the compression piston upward from the bottom dead center dead center, the function of the two-stroke marine engines processors, one is to increase the air temperature, fuel combustion to prepare themselves: two to create conditions for gas expansion work. When the piston up, after the intake valve closes, 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 related to end, i.e. compression ratio, generally compression end pressure and temperature: Pc = 4 ~ 8MPa, Tc = 750 ~ 950K. Diesel auto-ignition temperature of about 543-563K, the compression end temperature than diesel fuel self-ignition temperature is much higher, enough to ensure the fuel injected into the cylinder of self-ignition combustion. Diesel fuel injected into the cylinder is 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 marine engine sales, to dead center before the start of the atomized fuel injected into the cylinder at 10 ~ 35 ° crank angle on the crank Go, and crank TDC after 5 ~ 10 °, the highest in the combustion chamber combustion pressure forces the piston downward. Marine diesel engines generally divided into high, medium and low speed diesel engines, listed in the table Key performance indicators 3 class diesel engine. \ N marine diesel marine host most of the time working at full load, sometimes changing operated under load. Ships often bumpy sailing, so marine diesel engine should be able to trim under 15 ° ~ 25 ° and yaw 15 ° ~ 35 ° of reliable operation. Marine engine manufacturers, Weifang Huadong (certified), marine engines supplied by Weifang Huadong Engine Co., Ltd. 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.