A ventilation apparatus of an internal combustion engine of the invention ventilates a chain chamber by recirculating blow-by gas to an intake passage through a blow-by gas recirculation pipe and introducing air into the chain chamber through an air introduction pipe. The air introduction pipe is secured to a head cover wall portion which corresponds to a portion of a head cover wall which defines the chain chamber.

A ventilation apparatus of an internal combustion engine of the invention ventilates a chain chamber by recirculating blow-by gas to an intake passage through a blow-by gas recirculation pipe and introducing air into the chain chamber through an air introduction pipe. The air introduction pipe is secured to a head cover wall portion which corresponds to a portion of a head cover wall which defines the chain chamber.

A valve cover module includes a unitary cover and carrier made of a carbon fiber composite. The unitary cover and carrier has a lower side with a peripheral edge for attaching to a cylinder head. The lower side of the unitary cover and carrier also has a series of cavities interconnected with aligned apertures defining bearing surfaces. A plurality of cam lobes is disposed in the series of cavities. Also, the valve cover module includes a camshaft rotatable on the bearing surfaces and extending through the aligned apertures to couple with the cam lobes.

Methods and systems are provided for diagnosis of oil dilution in an engine. In one example, a method may include sealing a crankcase and spinning an engine unfueled to heat and vaporize the oil in response to detection of rich engine operation. Pressure measurements at the sealed crankcase may be collected and compared to a baseline to diagnose a presence of fuel in the oil.

Positive crankcase ventilation (PCV) systems have been employed on naturally-aspirated engines for over half a century. The gases in the crankcase exit the engine into the engine intake due to the slightly elevated pressure in the crankcase. Flow is controlled via a PCV valve in a PCV duct. In pressure-charged engines, PCV flow stops when pressure in the intake exceeds that of the crankcase. Such stagnation leads to sludging and deposit formation. According to an embodiment of the disclosure, reverse flow through the system is allowed by installing a second PCV valve in parallel with the normally-provided PCV valve, with the second PCV valve allowing an opposite direction of flow. Oil separators are provided on both PCV ducts to and from the engine to remove oil from blowby gases for flow in either direction.

An engine system comprises an intake manifold including a manifold body downstream of an intake port and having a first through-aperture and a second through-apertures spaced apart from the first through-aperture on the manifold body; a positive crankcase ventilation (PCV) system including a first PCV branch and a second PCV branch communicated fluidly with the first through-aperture and the second through-aperture of the manifold body, respectively, and configured to route a blow-by gas in a crankcase to the intake manifold; and a variable valve assembly to regulate a flow passing through the first or second PCV branches.

An engine system comprises an intake manifold including a manifold body downstream of an intake port and having a first through-aperture and a second through-apertures spaced apart from the first through-aperture on the manifold body; a positive crankcase ventilation (PCV) system including a first PCV branch and a second PCV branch communicated fluidly with the first through-aperture and the second through-aperture of the manifold body, respectively, and configured to route a blow-by gas in a crankcase to the intake manifold; and a variable valve assembly to regulate a flow passing through the first or second PCV branches.

A control device is provided for uniformly distributing gases and/or liquids between at least two containers with a different internal pressure, such as, fuel containers, crank casings and the like, in particular in internal combustion engines with more than one cylinder bank and a separate intake air feed per bank. The gas feed line assemblies (1) leading to the cylinder banks are connected to a chamber of a double-acting pressure box (4) and the gas flow in the gas feed line assembly (1) with the greater underpressure is reduced using a diaphragm (7) that is deflected as a result of a pressure difference in the gas feed line assemblies (1) by means of at least one throttle valve (10, 11) that can be activated via at least one sliding element (8, 9).

A control device is provided for uniformly distributing gases and/or liquids between at least two containers with a different internal pressure, such as, fuel containers, crank casings and the like, in particular in internal combustion engines with more than one cylinder bank and a separate intake air feed per bank. The gas feed line assemblies (1) leading to the cylinder banks are connected to a chamber of a double-acting pressure box (4) and the gas flow in the gas feed line assembly (1) with the greater underpressure is reduced using a diaphragm (7) that is deflected as a result of a pressure difference in the gas feed line assemblies (1) by means of at least one throttle valve (10, 11) that can be activated via at least one sliding element (8, 9).

An engine bed plate includes a plurality of partition walls provided in a casing and dividing an interior of the casing to define a plurality of crank chambers. A first ventilation hole is provided in a front wall and each of the plurality of partition walls. The first ventilation hole is formed in a horizontal direction to ventilate the plurality of crank chambers.