Blow-by gas heating system for internal combustion engines

A blow-by gas heating system for a water-cooled internal combustion engine having an engine block, an intake manifold, a crankcase, and an overhead valve cover, and an air inlet port on the valve cover and a crankcase blow-by gas outlet port on the crankcase, with those ports at spaced locations, comprising, conduit means separate from the engine block connecting the blow-by gas outlet port to the intake manifold and including valve means for controlling the blow-by gas flow therethrough, conduit means separate from the engine block connecting the air inlet port to a source of fresh air, coolant conducting means separate from the engine block connected to the engine water-cooling system for circulating engine heated coolant through said coolant conducting means, and said coolant conducting means being positioned in heat exchange relationship with a portion of only said conduit means connecting the blow-by gas outlet to the intake manifold for heating the blow-by gas flowing therethrough.

A blow-by gas heating system for a water-cooled internal combustion engine having an engine block, an intake manifold, a crankcase, and an overhead valve cover, and an air inlet port on the valve cover and a crankcase blow-by gas outlet port on the crankcase, with those ports at spaced locations, comprising, conduit means separate from the engine block connecting the blow-by gas outlet port to the intake manifold and including valve means for controlling the blow-by gas flow therethrough, conduit means separate from the engine block connecting the air inlet port to a source of fresh air, coolant conducting means separate from the engine block connected to the engine water-cooling system for circulating engine heated coolant through said coolant conducting means, and said coolant conducting means positioned in heat exchange relationship with a portion of only said conduit means connected to the air inlet port for heating the fresh air flowing therethrough.

A blow-by gas heating system for a water-cooled internal combustion engine having an engine block, an intake manifold, a crankcase, and an overhead valve cover, and an air inlet port of the valve cover and a crankcase blow-by gas outlet port on the crankcase, with those ports at spaced locations, comprising, conduit means separate from the engine block connecting the blow-by gas outlet port to the intake manifold and including valve means for controlling the blow-by gas flow therethrough, conduit means separate from the engine block connecting the air inlet port to a source of fresh air, coolant conducting means separate from the engine block connected to the engine water-cooling system for circulating engine heated coolant through said coolant conducting means, and said cooling conducting means positioned in heat exchange relationship with at least a portion of both said conduit means for separately heating both the blow-by gas and the fresh air.