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 valve is opened at the same time, this Time is represented by the crank angle, called valve overlap angle. After the end of the exhaust stroke, intake stroke began, so the whole work cycle is repeated in accordance with the above procedure. Because of this diesel engine duty cycle that is four piston stroke crankshaft rotates two revolutions to complete marine engines, 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. The fourth stroke - exhaust. The function of the exhaust stroke the exhaust gas is discharged after expansion, in order to fill the fresh air, to prepare for the next intake cycle. When the working stroke of the piston is moved to the vicinity of the lower dead point, the exhaust valve opened marine engine manufacturer, piston driven by the crankshaft and connecting rod, up from the bottom dead center dead center manufacturer of marine engines, and the exhaust out of the cylinder outside. Due to the existence of the resistance the exhaust system, so when the exhaust stroke starts, the gas pressure inside the cylinder 0.025-0.035MPa higher than the atmospheric pressure applied, the temperature Tb = 1000 ~ 1200K. In order to reduce the resistance of the piston movement of the exhaust, the exhaust valve before your next stop on the open. The exhaust valve is opened, the gas has a pressure cylinder immediately rushed outside marine engine sales, in-cylinder pressure decreased rapidly, so that when the piston moves upward, the exhaust gas inside the cylinder piston upward rely discharged. To take advantage of the inertia of the exhaust gas flow of the exhaust gas discharge time was clean, exhaust valve was closed after top dead center. In the animation, the curve showing the exhaust stroke during the exhaust gas pressure cylinder is almost constant, but slightly higher than the atmospheric pressure few. The end of the exhaust stroke pressure Pr of about 0.105 ~ 0.115MPa, Pr residual gas temperature of about 850 ~ 960K. Prices marine engines, marine engines, marine engines supplied by Weifang East China Weifang Huadong Engine Co., Ltd. Weifang Huadong Engine Co., Ltd. (www.hdchai.com) strong, credible, in Shandong Weifang engine industry has accumulated a large number of loyal customers. The company better work attitude and constantly improve Weifang Huadong innovative ideas will lead into the brilliant and you work for a better future!