Engine Coolant Heated Crankcase Ventilation

Engine coolant heated crankcase ventilation





Engine coolant heated crankcase ventilation (turbocharged engines)
To counteract the risk of freezing in the crankcase ventilation pipe, it has been equipped with engine coolant heating. The heating is achieved by the coolant pipe being laid parallel to the crankcase ventilation pipe. The pipes have a common insulated sleeve.
The heated coolant comes from the rear of the engine. The pipe inlet is connected to the engine using a banjo coupling. The coupling hole diameter is calibrated so that the removal of the coolant should not affect the engine's normal coolant flow. The outlet is connected to the thermostat housing.
To ensure that there is always negative pressure in the crankcase ventilation, the hose between the PTC resistor and the flame trap has been equipped with an extra suction pipe. At the other end this extra suction pipe is connected to the engine intake manifold with a banjo coupling. The clutch hole diameter is calibrated so that the vacuum of the flame trap is held by the vacuum in the engine intake manifold up to 90 km/h (110 mph). After that the vacuum is taken from the turbo charger intake manifold.
The pipes for heating the crankcase ventilation pipe are aluminum and the rubber hoses used are extra tolerant of heat.