systems have been used to combine exhaust gas and blow - by for internal combustion engines . the mixing of the oily blow - by and the exhaust , however , has caused carbon particles to cake within the walls of intake passages and near intake valves . the subject exhaust gas and blow - by recirculation system overcomes this deficiency by inducing the oily blow - by within a passage of a cylinder head . the passage is located in close proximity to one of the plurality of combustion chambers such that the high velocity or flow rate of the intake air reduces the time and effect of the reaction between the hot exhaust gas and the oily blow - by . the subject exhaust gas and blow - by system utilizes a director tube extending through a bore of the cylinder head . the director tube is orientated to enable the flow of blow - by to enter the intake air in line with the flow path .