A blow-by gas device of a supercharger-equipped engine includes a blow-by gas passage that introduces blow-by gas into an intake passage via a positive crankcase ventilation (PCV) valve. A supercharger has a supercharger rotor provided integrally with a rotation shaft rotatably supported on a bearing part. A space communicating with the bearing part is connected to a communication passage. The communication passage guides the blow-by gas into the space.

An oil separator for trapping oil mist contained in blow-by gas includes a separation plate, an upstream oil-mist trapping chamber, and a downstream oil-mist trapping chamber. The upstream and downstream oil-mist trapping chambers are divided by the separation plate. The upstream oil-mist trapping chamber communicates with a flow inlet for blow-by gas. The downstream oil-mist trapping chamber communicates with the upstream oil-mist trapping chamber and communicates with a flow outlet for blow-by gas. A return port formed through the separation plate returns oil mist trapped in the downstream oil-mist trapping chamber into the upstream oil-mist trapping chamber. The return port is positioned vertically above the bottom surface of the upstream oil-mist trapping chamber and is positioned at substantially the same vertical level as the lowermost portion of the bottom surface of the downstream oil-mist trapping chamber.

An oil separating device for separating an oil mist from a blow-by gas is arranged on a flow passage of the blow-by gas. The oil separating device includes an oil separator having an inlet formed at one end thereof and an outlet formed at another end thereof opposite to the one end; a collision wall arranged at a downstream side of the oil separator, and including an uneven portion formed on a surface thereof to face the outlet of the oil separator; and a filter arranged between the oil separator and collision wall. The oil separator is formed such that the oil mist in the blow-by gas coalesces together to form a coalesced oil mist, the filter removes the coalesced oil mist from the blow-by gas, and the collision wall separates a remained oil mist remained in the blow-by gas through the filter.

An oil separating module for an internal combustion engine, including: an oil separator, an oil return arranged such that separated oil can flow through the oil return to an oil sump, a mounting, and a non-return valve having: a valve housing having a throughbore with a first end opening and a second end opening, and a valve body movably mounted in the valve housing such that the valve body transitions between an open position and a closed position. When the first end opening is above the second end opening, the valve body automatically transitions to, or remains in, the closed position when a second end opening pressure is greater than a first end opening pressure by at least a threshold pressure difference, and the valve body automatically transitions to, or remains in, the open position when the second pressure is not greater than the first pressure by at least the threshold pressure difference.

A clean-side oil and air separator includes (i) a first housing including a filter material; (ii) a second housing including a threaded portion adapted to be a direct replacement for an engine oil fill cap removably closing an oil engine fill port; and (iii) a coupler disposed between and removably coupling the first housing and the second housing; wherein the first housing, second housing, and coupler include a continuous fluid pathway therethrough that extends between (a) an air intake from a PCV valve and (b) the engine oil fill port; and wherein the filter material is disposed in said fluid pathway within said first housing.

A vehicle incorporates a turbocharged internal combustion engine and a crankcase ventilation system. That crankcase ventilation system includes a first vent line connecting a cam cover at a first spigot to an air inlet duct at a second spigot. In addition the system includes a second vent line connected between the crankcase and the intake manifold of the engine. A one-way valve is provided in the second vent line. A restriction is integrated into either the first spigot, the second spigot or a quick connect that connects the first vent line to the first or second spigot.

An explosion relief valve for a crankcase of an engine includes a carrier plate, a cap, and an annular flame arrestor. The carrier plate includes a valve plate that has a sinuous shape for redirecting flame back into the engine. The flame arrestor includes a plurality of layers of smooth metal sheets, with each layer having a pattern of apertures that is different in size and spacing than the pattern of apertures of its adjacent layer. The apertures of each layer are partially, and only partially, aligned with the perforations of its adjacent layers. The layers are laid flush against each other to minimize or eliminate air space between the layers, leaving only the air channels existing between the apertures of the metal sheet layers as passageways for exhaust gases to be released from the valve.

An internal combustion engine includes an engine block defining a plurality of cylinders each receiving a piston. A crankcase extends from the engine block and supports a crankshaft drivingly connected to the pistons and including a chamber enclosed by a wall portion that defines a first blow-by flow passage and first and second drain passages therethrough. An oil sump mounted to the crankcase. A first oil separator is mounted to the wall of the crankcase in communication with the first blow-by flow passage and the first drain passage and defining a second blow-by flow passage therethrough and a third drain passage extending therethrough in communication with the second drain passage. A second oil separator mounted to the first oil separator in communication with the third drain passage and defining a third blow-by flow passage in communication with the second blow-by flow passage.

A clean-side oil and air separator includes (i) a first housing including a filter material; (ii) a second housing including a threaded portion adapted to be a direct replacement for an engine oil fill cap removably closing an oil engine fill port; and (iii) a coupler disposed between and removably coupling the first housing and the second housing; wherein the first housing, second housing, and coupler include a continuous fluid pathway therethrough that extends between (a) an air intake from a PCV valve and (b) the engine oil fill port; and wherein the filter material is disposed in said fluid pathway within said first housing.

An engine housing component is provided, the housing component defining two or more drain channels configured to receive oil separated from a crankcase ventilation system and to drain said oil through the housing component, wherein the engine housing component comprises two or more drain features, each of the drain features corresponding to one of the drain channels, wherein each of the drain features is configured to allow an oil drain pipe to be coupled to the drain feature such that the oil drain pipe is in fluid communication with the corresponding drain channel, wherein a first drain feature differs from the or each of the other drain features, such that a particular oil drain pipe configured to couple to the first drain feature is not couplable to the other drain features. An engine housing assembly and kit of oil drain pipes is also provided.