About PCV System
When you wonder what a PCV system is? Okay, PartsAvatar has just listed everything about the PCV systems you need. Internal combustion engines are fitted with Crankcase Ventilation System (CVS), which is a one-way, pressurised passage. It allows the natural buildup of gases to pass directly through the crankcase. The word ' Blow-by ' is named because of the combustion material in the combustion chamber that blows through the piston rings and into the housing of the rotating assembly. On the other hand, turbocharged engines are complicated by turbocharger shaft exhaust leakages and, in a number of cases, stem seals from the valve. The gases released during the ' blow-by ' condense and combine with the oil vapour present in the crankcase unless oxygenated. This further leads to sludge formation or to dilution of the oil with unburnt fuel. Owing to excessive crankcase pressure, there are equal chances of engine oil leakage through the crankshaft seals and other valve seals and gaskets. It is therefore essential to use the crankcase ventilation system, as this enables the blow-by gases to be vented out of the crankcase via a PCV (positive crankcase ventilation). The ventilation mechanism often leads to the intake manifold allowing recirculation of the gases before exiting the tailpipe. This mechanism completely reduces emissions and is also called a closed-loop CVS, while an open-loop CVS directly emits through a philtre into the atmosphere.
How It Works?
Do you know how PCV works? Okay, the primary component of the PCV system is the PCV valve, which is a simple spring-loaded valve with inside a sliding pintle. The pintle is tapered inside the valve housing like a bullet helping to increase and decrease the airflow depending on its location. The pintle up and down movements adjust the opening of the orifice to control the volume of air that passes through the PCV valve. The PCV valve is usually placed on a valve cover or valley of intake and slips into a rubber grommet. The PCV valve position allows it to extract vapours from the inside of the engine without drawing oil out of the crankcase. The top of the PCV valve is attached through the hose to a vacuum port on the throttle side. It helps pump the vapours directly into the engine without damaging the body of the throttle or the carburetor. When the PCV system pulls air and blowby gases into the intake manifold, it has an effect similar to that of a vacuum leak on the air / fuel mixture. This is completely compensated for by the carburetor or fuel injection system calibration. So, the PCV system can be said to have no net effect on fuel economy, emissions, or engine performance. IMPORTANT: Removing the PCV system will be futile to boost engine performance. Tampering is prohibited without any emission control system, in compliance with EPA regulations. Disconnecting PCV system can also cause accumulation of moisture in the crankcase, resulting in engine-damaging sludge formation.
Where does it fit?
The position of the PCV usually depends on the type of engine that is present in the vehicle. If the car has an older turbo-free engine, the PCV valve can be placed at the top or at the side of the valve cover. The valve is mounted on these cars directly on the valve cover. So, basically, the PCV valve is mounted somewhere between the intake and the valve cover so if you face any difficulty finding it out on the valve cover then we advise you to check any hoses that are connected to the intake from the valve cover. You will find the PCV valve somewhere between these hoses. In the latest turbo cars, the PCV valve is located inside the hose several times. For example, it could be located under the intake inside the hose in Audi / Volkswagen / Skoda / Seat 1.8 t.