Abstract: A cylinder head for a motorcycle engine includes a lower surface adapted to be coupled to a cylinder, an upper surface adapted to be coupled to a rocker box and defining a plane, and a side connected between the upper surface and the lower surface. The head also includes a breather inlet extending into the upper surface, an intermediate passage extending into the upper surface, and a breather channel connecting the inlet and the intermediate passage, the breather channel lying in a plane that is generally parallel to the plane of the upper surface. The head also includes a breather passage extending into the side of the head and connected to the intermediate passage, the breather passage having a longitudinal axis that is generally parallel to the plane of the upper surface.

Abstract: A separator for a closed crank case ventilation system has an upstream located inlet and downstream gas and oil outlets. A plurality of flat plate baffles alternately extend from opposing side walls to form a tortuous path for blow by gasses to separate the oil from the gasses. The separator is located upstream from the crankcase depression regulator such that the pressure differential between the separator and the crankcase is minimal to allow the oil to easily open the check valve and return to the crankcase.

Abstract: A blow-by gas separator comprises a separator unit mounted on a front end surface of a cylinder block and having accommodation space for accommodating a drive mechanism that transmits the driving force of the crank shaft of an engine to a driven shaft. The separator unit is provided with a blow-by gas passage chamber formed along the outer peripheral edge of an upper part of the accommodation space, and has, formed therein, a blow-by gas flow-in port and a blow-by gas flow-out port, which are opened in the blow-by gas passage chamber.

Abstract: In a gas-liquid separation device for an internal combustion engine used in an outboard motor, comprising: a gas-liquid separation chamber defined in a part of the engine, the chamber being provided with first and second ports communicating with a crankcase, and a third port communicating with an intake passage, the first port is provided with a first one-way valve for allowing blow-by gas from the crankcase to flow into the chamber, and the second port is provided with a second one-way valve for allowing oil separated from the blow-by gas to be discharged from the chamber, wherein the second one-way valve includes a reed valve member adapted to selectively close the second port, and a valve seat defined by an annular surface which is elevated from a surface of a wall surrounding the second port and defines a larger opening area than the second port.

Abstract: The invention relates to an oil separator (1) for de-oiling crankcase ventilation gases of an internal combustion engine with the oil separator (1) comprising a cyclone encompassing a gas inlet connected to the crankcase of the internal combustion engine, a gas outlet connected to the suction passage of the internal combustion engine, and an oil outlet connected to a crankcase sump of the internal combustion engine. The novel oil separator is characterized in that instead of a single cyclone several smaller cyclones (11, 12, 13, 14) are provided arranged in parallel with each other.

Abstract: A rocker support assembly for a motorcycle internal combustion engine. The assembly comprises a pair of rockers positioned in spaced relation from each other, a breather housing, and a pressure-responsive member. The housing at least partially defines an inlet aperture, an outlet aperture, and a passage in fluid communication between the inlet aperture and the outlet aperture. The passage is positioned substantially between the rockers. The pressure-responsive member is disposed in the passage and is operable in response to pressure differences in the passage to permit or inhibit fluid flow through the passage from the inlet to the outlet. A filter element is disposed within the housing such that substantially all fluid flowing from the inlet aperture to the outlet aperture passes through the filter element.

Abstract: The invention relates to an air filter having a primary air region and a secondary air region separated by a barrier. The primary air region contains a filter element for filtering out particles in the primary air. The secondary air region is designed to receive crankcase emissions sent from an engine's crankcase. Crankcase emissions are a result of gas escaping past the piston rings and into the crankcase due to high pressures in the cylinder during compression and combustion. To aid in removing these gasses from the crankcase, a venturi is enclosed within the housing to increase the negative pressure within the housing and in the secondary air region. This increase in negative pressure draws crankcase emissions out of the crankcase and thus reduces oil and crankcase gas bleeding from the crankcase.

Abstract: A baffle for fitment over breather gas inlet of an internal combustion engine breather system to limit the ingress of oil droplets has a baffle plate at a first end, a second end connectable to a breather gas inlet, and a gas conduit extending between the ends, open at the second end and closed at the first end by the baffle plate, and having a perforated wall.

Abstract: An internal combustion engine breather system in which a lower engine volume is defined by an engine crankcase, an upper engine volume is defined by a top cover, and an upper forward part of the crankcase includes a housing defining a volume to accept a fuel injection pump. Breather gas inlet means are provided to receive breather gas from one or more locations within the volume defined by the fuel injector pump housing, a breather gas conduit fluidly connects the inlet to a separator capable of separating oil from suspension within the breather gas, and a breather balancing conduit fluidly connects the separator to the upper volume defined by the top cover.

Abstract: A closed crankcase ventilation system for a turbocharger internal combustion engine which uses differential pressure between the turbo compressor inlet and the crankcase to force blow-by gases through a separation device. The zone of low pressure of the turbo compressor inlet is located at the innermost diameter of the compressor inlet shroud. The difference between the pressure in the compressor inlet and the crankcase creates a vacuum which pulls gas from the crankcase into the ventilation system. The ventilation system includes a high restriction separator for removing oil from the blow-by gases. A control valve bypasses the separation device when insufficient pressure differential exists to drive the separator.

Abstract: A PCV heater including a fitting having a plug and a heat sink coupled to the fitting. The fitting and the heat sink define a gas flow path having a first end and a second end. The second end of the gas flow path defines a discharge port and the heat sink is proximate to the discharge port. The heater also includes a heating element coupled to the plug and electrically connectable to a power source. The heating element thermally engages the heat sink to communicate heat from the heating element to the heat sink when the heating element is electrically connected to the power source.

Abstract: There is described an improved method for treating crankcase emissions from an internal combustion engine, comprising the steps of directing the emissions from the crankcase to an emissions separator, subjecting the emissions in the separator to a series of cleansing operations for removal of contaminants, directing the flow of cleansed emissions through a one way check valve back to the engine for combustion and collecting the separated contaminants for disposal.

Abstract: A heating arrangement, particularly for preventing freezing of pipes for delivering crankcase gas from the crankcase of an internal combustion engine to the air intake, in which a valve (12, 18) is provided which includes at least one metal plate, and a PTC thermistor (20) or a resistance heater is disposed on the metal plate.

Abstract: A breather device for an engine comprises a gas-liquid separation chamber communicating with the crankcase chamber through the one-way valve, a breather passage opening the gas-liquid separation chamber into an air cleaner, first and second oil suction holes arranged below and above an inner end of the breather passage opening to the gas-liquid separation chamber, and an oil passage communicating the first and second oil suction holes to an oil reservoir chamber having a pressure lower than that of the gas-liquid separation chamber. This construction enables the oil separated from the blow-by gas and liquefied in the gas-liquid separation chamber to be returned quickly to the oil reservoir chamber through the first or second oil suction holes, irrespective of whether the engine is in an normal upright position or an inverted position.

Abstract: An apparatus for the treatment of gases in a positive crankcase ventilation (PCV) system, in an internal combustion engine, is provided with a housing defining a gas treatment chamber. At least one gas filtering medium is disposed in the chamber, and the gases from the engine crankcase are passed through the gas filtering medium in the chamber, before the gases are routed into the air intake portion of the engine. In addition, the gases, after passage through the gas filtering medium, are passed through an ionization device.

Abstract: A gas apparatus for internal combustion engine is disclosed in which recovered hydrocarbon gas vapors from the fuel tank and the hydrocarbon with radical hydrocarbon gas vapors from the crankcase, are mixed together with air and alcohol with water solution in an impeller mixing chamber causing modified hydrocarbon gas vapors and oxygen gas vapors to pass through an electronic ionizer producing negatively charged pre-oxidized hydrocarbon gas vapors, then fed through the air induction system to improve mass of air to mass of fuel ratio in an internal combustion engine. A method for production of negatively charged pre-oxidized hydrocarbon gas vapors is also disclosed.

Abstract: In a venting arrangement for an internal combustion engine including a crankcase with a cylinder block, a cylinder head mounted on the cylinder block, a cylinder head cover mounted onto the cylinder head, and an oil separator integrally formed with the cylinder head cover, the oil droplets contained in the vent gases are separated from the vent gases as the vent gases are drawn through the oil separator and the oil-free vent gases are then supplied to the engine air intake duct. The oil is collected and drained by way of a siphon consisting of a cavity formed in the cylinder head and a drain pipe extending from the oil separator in the cylinder head cover into the cavity which, at its bottom, includes a bore through which a cylinder head bolt extends for mounting the cylinder head onto the cylinder block.

Abstract: A PCV heater including a plug and a heat sink coupled to the plug. The plug and the heat sink define a gas flow path having a first end and a second end. The second end of the gas flow path defines a discharge port and the heat sink is proximate to the discharge port. The heater also includes a heating element coupled to the plug and electrically connectable to a power source. The heating element thermally engages the heat sink to communicate heat from the heating element to the heat sink when the heating element is electrically connected to the power source. A method for manufacturing the PCV heater includes the steps of placing a heat sink into a mold cavity, coupling a heating element to the heat sink, electrically connecting a first lead wire and a second lead wire to the heating element, and providing a high temperature plastic to the mold cavity to overmold the heat sink and the heating element.

Abstract: In a crankcase venting system for an internal combustion engine having an engine intake duct including a throttle valve, a partial load venting line extending from the engine to the intake duct downstream of the throttle valve and including a vent line throttle and a full load venting line connected to the engine and leading to the intake duct upstream of the throttle valve, an aspiration line extends between the intake duct upstream of the throttle valve and the partial load venting line for controlling the vacuum generated in the partial load venting line.

Abstract: An oil separating apparatus of an engine mounted on a shaking machine such as a rammer, for separating oil mist from blow-by gas and for feeding liquefied oil back to a crank chamber comprises a rocker chamber having an enlarged volume and mounted on a cylinder head, a breather chamber mounted on the rocker chamber, a blow-by gas port provided on the locker chamber for communicating the rocker chamber with the breather chamber, and an oil passage having an enlarged passage area for communicating the crank chamber with the rocker chamber. The constituted oil separating apparatus separates oil mist from blow-by gas almost completely and returns liquefied oil to the crank chamber swiftly, even when the engine produces a large amount of oil mist due to violent vibrations of the shaking machine.

Abstract: In a venting arrangement for a crankcase of an internal combustion engine including a centrifugal separator having a rotatable housing with an inlet channel for the admission of an oil-air mixture and an exit channel for the discharge of air from which the oil has been removed, the inlet channel extends essentially in a direction parallel to the axis of rotation of the housing, but in spaced relationship from the axis so that oil which has been separated from the oil-air mixture moves, subjected to centrifugal forces, radially outwardly at a 90.degree. angle to the generally axial oil-air mixture flow through the separator.

Abstract: A method for cleaning exhaust gas for internal combustion engines or combustion equipment is provided, which comprises the steps of: irradiating air, which is introduced through the air inlet of the engine or equipment, with .alpha.-rays by alpha-decay thereof, to thereby transform diatomic oxygen in the air into a powerful oxidizing active oxygen while transforming, by fission, a part of nitrogen in the air into a monatomic oxygen and monatomic hydrogen, and supplying the combustion equipment or internal combustion engine with the air containing the active oxygen, monatomic oxygen and hydrogen to reduce toxic components from the exhaust gas. An exhaust gas cleaning apparatus for internal combustion engines or other combustion equipment is also provided, which comprises a natural radioactive element which emits 0.001 to 0.6 becquerels of .alpha.-rays by alpha-decay thereof.

Abstract: A crankcase blowby disposal system for a reciprocating engine comprising a heat exchanger in fluid communication with an oil filter and the crankcase in which blowby comprising oil droplets, oil mist, oil vapor, water vapor and other gases, the blowby is vented from the crankcase, passes through the heat exchanger which cools the blowby to a temperature below the dew point of the oil vapor and above the dew point of the water vapor, whereby the oil vapor condenses and the water vapor does not condense, then the cooled blowby passes through an oil filter which removes essentially all the oil from the blowby, the oil free blowby is then returned to the engine intake or exhaust or vented to the atmosphere, the oil collected in the oil filter may be returned to the crankcase.

Abstract: In an oil separator designed as an electrostatic filter with a one-piece discharge electrode and a collecting electrode, said separator being located in the vent line of a crankcase ventilation system for an internal combustion engine, the invention proposes that the spray electrode be made in two stages, with a first stage having a small cross-sectional area and a second stage having a cross-sectional area that is larger than that of the first, and with the spray electrode tapering from the cross-sectional area of its second stage to the smallest cross-sectional area of its first stage, and with the first stage being made in the shape of a cone and having a base that adjoins the second stage and a freely terminating tip.

Abstract: In a venting arrangement with integrated oil separator for venting gases from the crankcase of an internal combustion engine having a cylinder head with a cylinder head cover, the cylinder head cover includes integrally formed therewith a housing divided into a raw gas space receiving vent gases from the engine crankcase and having an exit opening directed toward the cylinder head and a purified gas space having an inlet opening disposed adjacent the exit opening of the raw gas space and both openings are disposed above a collection space which is formed in the cylinder head and in which the raw gas flow from the raw gas space is reversed and redirected into the purified gas space whereby the oil droplets are separated from the vent gas and collected in the collection space to be returned to the engine crankcase.

Abstract: A crankcase ventilation system withdraws vapors from the crankcase of an internal combustion engine by using intake manifold vacuum to transfer crankcase vapors from a position in the engine crankcase, away from any lubricant pool, into the air/fuel intake manifold system, thereby moving the crankcase vapors along with a controlled amount of bleed (ambient) air to the intake manifold of the engine. The engine crankcase is kept under negative pressure by careful sizing of the parts, and the intake tube for bleed air is the only air admission to the crankcase so as to maintain this negative pressure condition within the engine crankcase. The bleed air intake tube is located adjacent the outlet tube for combining crankcase vapors and bleed air, without particulate or contaminates from the crankcase, and directed to the engine fuel/air intake manifold through a thermal cooling chamber.

Abstract: An internal combustion engine in which the oil content of blow-by gas is reduced by conveying the blow-by gas (34) away from the engine to be cooled in a heat exchanger (30). Oil (40) condensing from the cooled blow-by gas (34) is returned to the engine and the cooled blow-by gas is exhausted to atmosphere or conveyed to the engine air intake system.

Abstract: A breather structure for a blow-by gas which is capable of reducing the oil content in a blow-by gas as much as possible. A breather structure for the blow-by gas in an internal combustion engine, in which an auxiliary machinery is provided in a crank chamber of the internal combustion engine for centrifugally separating the oil content from a blow-by gas by rotation of a rotor portion, integrated with a crank shaft, of the auxiliary machinery. A breather passage for introducing the blow-by gas from which the oil content is separated to the outside of a crank chamber is formed in an auxiliary machinery cover for covering side portions of the auxiliary machinery. In this structure, a cylindrical wall having a center axis identical to the rotational center axis of the rotor portion of the auxiliary machinery is formed in such a manner so as to project from the auxiliary machinery cover to the rotor portion.

Abstract: In a ventilating arrangement for an internal combustion engine, a venting line for supplying venting gases from the engine crankcase to the air intake pipe includes an oil separator from which an oil return line extends downwardly on the outside of the engine crankcase front wall into an upwardly open oil pocket also arranged on the outside of the crankcase front wall so as to form a siphon therewith through which the oil can return from the oil separator to the oil sump in the oil pan under the crankcase against the excess pressure normally developing therein during engine operation.

Abstract: In a device for separating oil from the blow-by exhaust vapors of a combustion engine, a filter stack is mounted in a canister having an inlet port for the intake of vapors from the engine, a gas outlet port for connection to a source of suction for causing the vapors to flow through the canister, and a discharge port communicating with a flow passage for removal of condensed oil. The filter stack is operatively arranged so that the vapors pass in contact with and through the filter stack. A plate partially surrounds the filter so that the oil in the vapors condense, and flow outwardly through the passage between the plate and the interior wall surface of the canister.

Abstract: A crankcase ventilating system for an internal combustion engine includes a vent line issuing from the crankcase and connected to a liquid separator. The liquid separator has a collecting chamber for separated liquid and at least two drain lines returning to the crankcase. The liquid separator also has a connection leading to the vacuum line of the internal combustion engine.

Abstract: A closed crankcase emission control assembly for an internal combustion engine incorporates into a single compact unit a pressure control assembly, a filter and an oil drain check valve. The pressure control assembly has a gate whereon oily contaminated crankcase emission impinge and oil is separated. The separated oil is collected in a reservoir and returned to the crankcase. The pressure control assembly also has a variable orifice agglomerator which agglomerates particles in the contaminated crankcase emission to form larger particles. Thus, the pressure control assembly simultaneously regulates pressure, separates oil and agglomerates particles. The agglomerated particles are filtered by a filter which may be coarse and clogs less often.

Abstract: A centrifugal oil separator assembly (36) mounts to the front cover (26) of an internal combustion engine (20) adjacent to the engine crankcase (34). The oil separator assembly (36) includes a first rotational member (42) that has turbo fan blades (52) and a second rotational member (56) that has centrifugal fan blades (60) and air seal grooves (66). A driven pulley (44) causes the oil separator assembly ( 36 ) to rotate. As it rotates, blowby gas is drawn through the centrifugal fan blades (60) where oil is separated from the gas and then through the turbo fan blades (52) which pushes the filtered gas into an air flow passage (28, 30) leading to the air intake system (31).

Abstract: In a supercharged engine, a supercharger and a throttle body disposed midway in an intake passage are located away from an engine block. A blow-by gas passage constituting a PCV apparatus is connected between a portion of the intake passage located on the upstream side of a throttle valve and a crankcase. The blow-by gas passage returns the blow-by gas collected in the crankcase to the intake passage. A cooling water passage extending from the engine block is connected to a radiator. A water passage extending from the radiator is connected to the engine block via the throttle body, which water passage encloses the blow-by gas passage in an intermediate portion thereof.

Abstract: The combination apparatus, preseparator, vacuum regulator and check valve silences and filters air flow and separates air-contaminant mixtures. The combination apparatus comprises an annular housing having an outer wall and a channel defining a central axis. The channel has a primary gas inlet coupled to an air filter, a primary gas outlet coupled to an engine induction system, and a channel wall therebetween. A secondary inlet port passes through the outer wall and a secondary inlet port defines an opening in the channel. A baffle is axially disposed within the housing defining a first and second flow passageway. Second baffles are disposed within the first and second passageways to effect serpentine flow through each flow passageway and filter material is disposed within each flow passageway. A preseparator is coupled between the secondary inlet and an engine breather and has an annular housing with preseperator baffles disposed therein for effecting serpentine flow therethrough.

Abstract: An oil separator for reducing oil carryover from the vent port of the crankcase of an internal combustion engine, such as a diesel engine is provided. The separator includes a cylindrical housing filled with a filtration material and having both an inlet and an outlet in its upper portion and a downwardly disposed, frustro-conical wall that defines an annular chamber between its outer surface and the inner walls of the housing. The annular chamber defines a helical flow path through the filtration material in the housing for a stream of oil-laden air admitted through the inlet of the housing. Oil droplets are removed from the stream of air as it moves through the helical path both by impingement against the filtration material, and the by centrifugal impingement against the inner walls of the housing.

Abstract: An oil separator for the gases of the crankcase ventilating system of an internal-combustion engine has a filter element through which the breathing gases flow and from which the separated oil is returned via an oil return into the oil tank 4. The blow-by gases, from which the oil was removed, are supplied to the air intake system of the internal-combustion engine. A vacuum generator is provided which generates a specified constant vacuum for the sucking-off of the blow-by gases. In addition, an air oil removal element that separates the oil has microfibers which are made of fiber glass material.

Abstract: A fuel engine combustion aid having a first guide hole connected to the positive crankcase ventilation pipe of a fuel engine, a second guide hole connected to the intake manifold of the fuel engine and having a middle part communicated with the first guide hole, an air chamber at one side mounted with an air filter box, a valve chamber communicated between the air chamber and the second guide hole, a valve installed in the valve chamber and controlled by the fuel engine to let fresh air be drawn through the air chamber and the valve chamber into the second guide hole then into the positive crankcase ventilation pipe via the first guide hole upon each intake stroke of the fuel engine.

Abstract: A number of embodiments of crankcase ventilating systems for gas powered internal combustion engines employed in heat pumps. The crankcase ventilating system includes an oil vapor separator for separating and condensing oil from the crankcase ventilating gases and returning water vapor and the crankcase ventilating gases to the engine induction system for further combustion and purification. A number of various arrangements for controlling the temperature of the oil vapor separator are disclosed and an embodiment is disclosed that employs a pair of oil vapor separators acting in series.

Abstract: A one-piece valve cover product for use on an internal combustion engine having an engine cylinder head, said cover product including dome-like upper portion which acts as a cover over the cylinder head area of the engine, a peripheral flange portion adapted for sealing engagement to the cylinder head, a plurality of apertures through said flange portion through which a plurality of fasteners can be inserted to secure said cover product in sealing engagement to the cylinder head, said valve cover including in an upper portion thereof a molded or cast conduit passageway member formed as part of the valve cover itself, said passageway member extending inside the cover and being adapted to receive an air/oil vapor mixture associated with operation of the engine and to condense oil out of said air/oil mixture, at least one or more apertures located in a lower part of that passageway member to permit the oil droplets which are condensed, to drain back into the engine, and wherein said valve cover is formed from a

Abstract: An oil/air separator (10) condenses and collects oil vapors carried by blow-by gases from the crankcase of an internal combustion engine. The oil/air separator comprises an inlet vent (17), an outlet vent (56), a first filter means (32), a second filter means (34), a third filter means (44), an oil collection chamber (28), an excess oil return line (64), and a drain plug (61). The integrity of the combustion chamber in preventing air/fuel vapors and exhaust gases from passing into the crankcase can be determined by the amount of accumulated oil (62) in the collection chamber.

Abstract: A ventilation system for an automotive engine having a crankcase, 12, an induction system, 14, 16, crankshaft, 18, and at least one camshaft, 20. A processor, 22, pumps gases from the crankcase and separates entrained lubricating oil from the pumped gas flow. A recovery apparatus, 24, 30 introduces the separated gas to the induction system while returning the separated oil to the crankcase.

Abstract: An apparatus for the treatment of gases in a positive crankcase ventilation (PCV) system, in an internal combustion engine, is provided with a housing defining a gas treatment chamber. Gas filtering media is passed through the chamber and the gases from the engine crankcase are passed throughout the gas filtering media in the chamber, before the gases are routed into the air intake portion of the engine.

Abstract: A gas/liquid separator device includes a separator, such as a cyclone type separator, provided in a blowby gas passage for introducing a blowby gas from a blowby gas chamber of an internal combustion engine, an oil accumulator in the form of a container for accumulating separated and condensed oil mist, another passage provided separately from the blowby gas passage for returning the oil from the oil accumulator to an oil collection chamber, and a communication blocking element for blocking a communication between the oil accumulator and the oil collection chamber while the engine is running.

Abstract: An ambient air system and pollution control device for an internal combustion engine includes a valve housing having an inlet port for receiving blow by gases from the engine crank case. The housing also includes an ambient air inlet with a flow passageway in the housing in communication with the gas inlet port and with the ambient air inlet. The passageway has a tubular filter at its downstream discharge end so that gases and ambient air may mix in the passageway and be filtered before being discharged from the housing through an outlet port.

Abstract: The present invention comprises a method and apparatus for trapping and separating contaminated elements found in crankcase emissions that are released through a positive crankcase ventilation system of a combustible engine, the apparatus being defined as a canister having a reservoir chamber in which is mounted a ceramic permanent magnet and a separator screen, whereby hydrocarbons, crankcase oil and unburned combustible fuel enter the canister passing through the north and south magnetic fields of the magnet and are then separated through the separator screen, after which the hydrocarbons, crankcase oil and other associated metals are trapped in the reservoir and the intermixed unburned volatile vaporized fuel mixture is returned to the combustion chambers of the engine to be reburned.

Abstract: An oil mist separator for a gas flow having oil particles suspended therein, comprising a separator element including a duct having an open end, a closed end and a the wall extending between said open and closed ends. The separator element further comprises a longitudinal axis extending between the open and closed ends with the longitudinal axis being parallel to the side wall. The separator element includes an inlet orifice formed in the side wall and a drain orifice formed in the side wall between the inlet orifice and closed end. The separator element also includes an impingement plate mounted within the side wall, with the impingement plate extending upward from the closed end a sufficient distance so that the impingement plate faces the inlet orifice.

Abstract: A closed loop engine crankcase breather system is provided with a breather tube engaged between a rocker arm housing of the engine and an intake air tube of the engine downstream of the air cleaner therefor. The end of the breather tube within the intake air tube is curved so that the opening thereof faces directly into the stream of air flowing through the intake air tube to thereby reduce the vacuum within the crankcase by the velocity head of the intake air stream and thus maintain a smaller pressure differential between the interior cavity of the engine and the atmosphere.

Abstract: The invention concerns a crankcase or cylinder block for an internal combustion engine of any type, for example, of the V or in-line cylinder type. The upper half of the crankcase comprises internal conduits which connect the upper part of the crankcase with the lower compartments separating the crankshaft bearings, these conduits making possible the exhaust of crankcase gases and the recycling of the engine oil and opening into a chamber of a flat shape, with said chamber and said internal conduits forming an integral as-cast system. The invention applies in particular to the automotive industry.

Abstract: Apparatus for receiving crankcase emissions from an internal combustion engine and for separating the liquid portions of the emissions from the gaseous portion thereof. The apparatus includes a mounting flange, an opening for the return of the liquids to the engine, and at least one layer of filtering material. In one embodiment, the filtering material may be soaked with oil. Another embodiment has a screw mounted in the housing, and positioned to retard the flow of emissions exiting from the housing. The apparatus includes an outlet for return of the gaseous portion of the emissions to return to the combustion chamber via the PCV line or the induction manifold.