An engine device with high reliability and high safety even in use in cold regions, especially in arctic regions at 20 C. or less, the engine device including: a heating portion (21, 22, 23, 24, 25, 26) configured to increase a temperature in a mixed region where an intake air flowing in a blow-by gas mixed joint (20, 20A, 20B, 20C, 20D) and a blow-by gas introduced from a returning hose (12) are mixed; and/or a pressure regulation portion (121, 125) having a blow-by gas passage in which the blow-by gas from a combustion chamber flows.

A blow-off valve for controlling the pressure in an intake tract of an internal combustion engine, comprising a housing and a flow path formed in the housing, wherein the flow path is opened and/or closed by means of piston, which may be placed onto valve seat, wherein the piston is connected to a pin, which is moved by means of an electromagnetically producible force, wherein motion of the pin is transferred to the piston, wherein the support of the pin within the blow-off valve is realized by means of exactly one sliding sleeve, wherein the pin is moved in relation to the sliding sleeve.

A heat exchanger assembly may include an intercooler and a housing which encloses said intercooler. The housing may be part of a charge air line. The housing may include a charge air inlet, a charge air outlet and an opening through which the intercooler can be inserted into the housing from one side. The housing may also include a recess on the side opposite the opening, into which recess the intercooler engages. The heat exchanger assembly may include an elastic seal arranged in the region of the recess between the intercooler and the housing. The seal may be configured to at least one of bridge the deformation of the housing occurring during pressure pulsations, bridge relative movements between the intercooler and the housing, and tightly connect the intercooler to the housing in all operating states preventing an undesirable bypass flow.

An intake manifold made of synthetic resin includes first, second and third members stacked in sequence and welded to form the intake manifold; a collector extending inside the intake manifold in a direction of a line of cylinders, a part of wall of the collector being formed by the third member; a plurality of branch passages formed substantially by the first and second members and wound around an outer periphery of the collector; and a connector passage leading from the collector to an outer peripheral side of the branch passage. The first, second and third members are respectively provided with first, second and third cylinder portions that are coaxially arranged with each other in a position between adjacent two branch passages. The connector passage is formed by the first, second and third cylinder portions with the connector passage communicating with an inside space of the collector.

An air intake duct (50) for a motorcycle supplies air taken in through an air inlet (24) in a front portion of a vehicle body to an engine (E) located at a center portion, in a longitudinal direction of the motorcycle, of the vehicle body. The air intake duct (50) includes a duct front (69) having the air inlet (24) formed at a front end thereof, and a duct body (70) removably coupled to a rear end portion of the duct front (69). The duct body (70) extends in the longitudinal direction so as to pass through an outer lateral side of the engine (E) and is removably connected at a rear end portion thereof to an air cleaner (40). In a state in which the duct body (70) is removed from the air cleaner (40), a cleaner element (87) can be attached and removed.

An air intake system having a turbocharger and an intercooler provides combustion air for an internal combustion engine of an all-terrain vehicle. The all-terrain vehicle includes a straddle seat, and the he intercooler is mounted above the internal combustion engine. The intercooler has a plurality of pressurized air crosspipes defining an intercooler plane. An intercooler attack angle of the intercooler plane relative to horizontal is greater than or equal to 80 and less than 90. The air intake system includes an intake pressure relief system with a pressure sensor and a pressure relief valve. When the pressure sensor senses an onset of an overpressure event, the pressure relief valve is opened. The turbocharger housing is integrally formed with the exhaust manifold, and the exhaust manifold has flange gaps between exhaust intake ports, which allow thermal expansion difference between the cylinder head and the exhaust manifold.