The working of Positive crankcase ventilation(PCV) is explained in this video in brief. The Positive crackcase ventilation is utilized to collect the blowby gases from the crankcase and to combine them with a fresh mixture at the intake manifold. A positive crankcase ventilation technique is used to reduce the emission of unburnt HC. The two distinguished methods of Positive crankcase ventilation have been discussed in this video.
fixed orifice type Positive crankcase ventilation and
Positive crankcase ventilation using variable flow PCV valve
Positive crankcase ventilation prevents the sludge creation in the crankcase and ultimately pumping losses.

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