Вентиляция картера Беларус ( Belarus ) МТЗ Д240 MTZ D240 A crankcase ventilation system is a one way passage for gases to escape in a controlled manner from the crankcase of an internal combustion engine. This is necessary because internal combustion inevitably involves a small but continual amount of blow-by, which occurs when some of the gases from the combustion leak past the piston rings (that is, blow by them) to end up inside the crankcase, causing pressure to build up in the crank case. For control of the pressure inside it, a PCV (Positive crankshaft ventilation) is used to vent the crank case. Not all petrol engines have PCV valves. Engines not subject to emission controls, such as certain off-road engines, retain road draft tubes. Dragsters use a scavenger system and venturi tube in the exhaust to draw out combustion gases and maintain a small amount of vacuum in the crankcase to prevent oil leaks on to the race track. Small gasoline two stroke engines use the crankcase to partially compress incoming air. All blow by in these engines is burned in the regular flow of air and fuel through the engine. Many small four-stroke engines such as lawn mower engines and small gasoline generators, simply use a draft tube connected to the intake, between the air filter and carburetor, to route all blow by back into the intake mixture. The higher operating temperature of these small engines prevents large amounts of water vapor and light hydrocarbons from condensing in the engine oil. Video & sound quality low? promote channel and donate https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=VPTKH5UYL59PC Thanks Check out also my other channel,if you edit videos and need music with no copyrights https://www.youtube.com/c/NoCopyrightMusicForYoutube Thanks