Gasoline distributor: distributes gasoline to each fuel injector. The fuel injector is connected below it and is blocked from view.
Crankcase ventilation pipe: The one on the right is the intake pipe, and the one on the left is the exhaust pipe. Their function is to ventilate the crankcase.
Detailed explanation: When the engine is working, there is always a part of the combustible mixture and exhaust gas that escapes into the crankcase through the piston rings. The gasoline vapor that escapes into the crankcase condenses and will thin the engine oil and deteriorate its performance. The exhaust gas contains water vapor and sulfur dioxide. The water vapor condenses in the engine oil to form foam, destroying the engine oil supply. This phenomenon is especially serious in winter; sulfur dioxide reacts with water to form sulfurous acid, and sulfurous acid forms sulfuric acid when it encounters oxygen in the air. These acidic substances The appearance of oil not only deteriorates the engine oil, but also causes corrosion of parts. As the combustible mixture and exhaust gas escape into the crankcase, the pressure in the crankcase will increase, and the engine oil will leak out from the crankshaft oil seal, crankcase liner, etc. and be lost. The oil vapor lost into the atmosphere will increase the pollution of the engine to the atmosphere. The engine is equipped with a crankcase ventilation device to avoid or alleviate the above phenomenon. Therefore, the functions of the engine crankcase ventilation device are: 1. To prevent the deterioration of the engine oil; 2. To prevent the leakage of the crankshaft oil seal and crankcase liner; 3. To prevent various Oil vapor pollutes the atmosphere. Crankcase ventilation includes natural ventilation and forced ventilation. Modern gasoline engines often use forced crankcase ventilation, also known as PCV system. When the engine is running, the vacuum in the intake pipe draws fresh air into the cylinder head cover through the air filter and air hose, and then enters the crankcase through the holes in the cylinder head and body. After the fresh air and crankcase gas in the crankcase are mixed, they enter the intake pipe through the cylinder head cover and crankcase gas hose, and finally enter the combustion chamber through the intake valve and are burned.