Positive crankcase ventilation

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Positive crankcase ventilation

  1. 1. CRANKCASE VENTILATION SYSTEM POSITIVE CRANKCASE VENTILATION (PCV)
  2. 2. CRANKCASE VENTILATION SYSTEM A way for gases to escape in a controlled manner fromcrankcase of an internal combustion engine. Internal combustion inevitably involves a small but continualamount of blow-by. Occurs when some of the gases from the combustion leak pastthe piston rings to end up inside the crankcase.
  3. 3. POSITIVE CRANKCASE VENTILATION ( PCV) During World War II, different type of crankcase ventilation be inventedto allow tank engines operate. Normal draft tube ventilator allow water to enter the crankcase anddestroy the engine. PCV reduces blow-by emissions from the engine. 20% of HC emissions produced by a vehicle. The higher the mileage on engine and the greater the wear on the pistonand cylinders, the greater the blow-by into the crankcase.
  4. 4. MAJOR COMPONENT The major component in PCV are PCV valve, a simple spring-loaded valve with a sliding pintle inside. The pintle is tapered like a bullet so it will increase or decreaseairflow depending on its position. The movement of the pintle changes the orifice opening. The PCV valve is located in a valve cover or the intake valley,and fits into a rubber grommet.
  5. 5. HOW PCV WORKS A hose connects the top of PCV valve to a vacuum port onthrottle body, carburetor or intake manifold. This allows the vapors to be siphoned directly into engine w/ogumming up throttle body or carburetor. PCV has the same effect on the air/fuel mixture as a vacuumleak.

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