Crankcase Ventilation
In an internal combustion engine, crankcase ventilation is important to clean engine oil and separate it from the residual gases that pass piston rings and valve seals, so called blow-by.
In a supercharged engine where the extra boost pressure in the engine affects the amount of blow-by, it is very important to have correctly sized crankcase ventilation that can take care of the extra supply of waste gases that boosting causes. The crankcase ventilation on the engines in the VEA family is pressure controlled and completely closed. The system comprises, in addition to the internal channels in the engine block, of an oil separator in plastic placed on the cam cover and a hose between the separator and the fresh air pipe.