Because of the intake and exhaust valves are open as early as late off; so at the beginning of the end of the exhaust stroke and the intake stroke, the piston is near the top dead center, there is a period of time the intake and exhaust valves simultaneously opened Shandong East China Ship machine cooperation, this time represented by the crank angle, called valve overlap angle. Weifang East China after the end of the exhaust stroke boat engine service, began the intake stroke, so the whole work cycle is repeated in accordance with the above procedure. Because of this diesel engine piston stroke operating cycle consists of four two revolutions of the crankshaft rotation that is done, so that four-stroke diesel engines. In the four-stroke four-stroke diesel engine, only the third stroke of the Working punch has generated strong external work force, while the remaining three strokes are the power consumption of the preparation process. To do this on a single-cylinder diesel engine flywheel must be installed using the rotational inertia of the flywheel, the crankshaft continuous and uniform operation of the four stroke. Marine diesel fuel in the combustion chamber to ignite, generate high pressure gas. In the gas piston driven by the only point on the downward movement of Shandong in East China sales, external work. Piston down until the vent open (when the crank position in the East China ship machines, gas expansion work at this end, a large number of in-cylinder exhaust gas on its own high-pressure free, people from the exhaust port to the exhaust pipe. Weifang Huadong ship machine sales service _ Shandong East China (Online) _ EAST ship machines by Weifang Huadong Engine Co., Ltd. Weifang Huadong Engine (www.hdchai.com) is an industry leader in Shandong Weifang, the internal combustion engine, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs in Weifang, east China leadership with the staff warmly welcome all inquiries negotiations to create a better future Weifang, east China.