A drive unit is situated between a first wheel axle and a second wheel axle and has an internal-combustion engine with a crankshaft system including a horizontally oriented crankshaft, which crankshaft acts upon a continuously variable transmission system which drives wheels of the first wheel axle and of the second wheel axle. The crankshaft is caused to rotate by at least one piston of the engine. The crankshaft interacts with a first set of V-pulleys of the transmission system, which first set of V-pulleys, by way of a first drive shaft, is connected with a first differential of the first wheel axle. The first set of V-pulleys, by way of an endless member, is in an operative connection with a set of V-pulleys which, with the interposition of a second drive shaft, influences a second differential of the second wheel axle.

An exemplary engine includes an engine body including at least one cylinder row in which a plurality of cylinders are arranged in a front-rear direction, an intake pipe disposed on one side surface of the engine body and extending in the front-rear direction, and a first electric wire disposed below the intake pipe and along the one side surface.

An engine system may include an engine including first and second cylinder banks; a throttle valve; a first exhaust manifold gathering exhaust gas exhausted from the first cylinder bank to be supplied to the first exhaust line; a second exhaust manifold gathering exhaust gas exhausted from the second cylinder bank to be supplied to the second exhaust line; a turbocharger including a turbine rotated by the exhaust gas exhausted through the first exhaust manifold and a compressor rotated in connection with the turbine; a cylinder deactivation (CDA) device selectively deactivating the cylinders of the first cylinder bank; and a supercharger including a motor and an electric compressor operated by the motor.

A drive unit is situated between a first wheel axle and a second wheel axle and has an internal-combustion engine with a crankshaft system including a horizontally oriented crankshaft, which crankshaft acts upon a continuously variable transmission system which drives wheels of the first wheel axle and of the second wheel axle. The crankshaft is caused to rotate by at least one piston of the engine. The crankshaft interacts with a first set of V-pulleys of the transmission system, which first set of V-pulleys, by way of a first drive shaft, is connected with a first differential of the first wheel axle. The first set of V-pulleys, by way of an endless member, is in an operative connection with a set of V-pulleys which, with the interposition of a second drive shaft, influences a second differential of the second wheel axle.

An internal combustion engine includes a throttle valve assembly having a main passage and an idle air passage. The main passage is in fluid communication with the intake valve, air being intermittently input into a combustion space through the main passage based on position of an intake valve. The idle air passage is integrally formed in the throttle valve body, and is controlled by a motor to selectively introduce air into the main passage downstream of the throttle plate. For a cylinder hole diameter in the range from 70 mm to 74 mm, both the intake valve angle defined between the intake valve axis and the cylinder axis and the exhaust valve angle defined between the exhaust valve axis and the cylinder axis are in the range from 11 degrees to 15 degrees.

An internal combustion engine for an outboard motor comprises a cylinder block having first and second banks of cylinders that extend transversely with respect to each other in a V-shape so as to define a valley there between. An exhaust manifold conveys exhaust gas from the internal combustion engine and is at least partially disposed in the valley. A supporting mechanism supports the exhaust conduit with respect to the internal combustion engine. The supporting mechanism is configured to allow the exhaust conduit to move with respect to the internal combustion engine in 360 degrees in a plane defined by the lateral and transverse axes, and laterally towards and away from the internal combustion engine, thereby facilitating assembly of the exhaust manifold and the internal combustion engine despite positional tolerance differences there between.

An engine system may include an engine including first and second cylinder banks; a throttle valve; a first exhaust manifold gathering exhaust gas exhausted from the first cylinder bank to be supplied to the first exhaust line; a second exhaust manifold gathering exhaust gas exhausted from the second cylinder bank to be supplied to the second exhaust line; a turbocharger including a turbine rotated by the exhaust gas exhausted through the first exhaust manifold and a compressor rotated in connection with the turbine; a cylinder deactivation (CDA) device selectively deactivating the cylinders of the first cylinder bank; and a supercharger including a motor and an electric compressor operated by the motor.

An engine includes an engine main body including a first cylinder and a second cylinder, a first exhaust pipe that is connected to the engine main body, a second exhaust pipe that is connected to the engine main body, and an exhaust manifold including a first inlet portion connected to a first lead-out portion that is a downstream end of the first exhaust pipe, a second inlet portion connected to a second lead-out portion that is a downstream end of the second exhaust pipe, and a common outlet portion that leads out exhaust gas flowing in from the first inlet portion and the second inlet portion, in which the first lead-out portion and the second lead-out portion face each other with central axes of the first lead-out portion and the second lead-out portion aligning on a same line.

An internal combustion engine includes a throttle valve assembly having a main passage and an idle air passage. The main passage is in fluid communication with the intake valve, air being intermittently input into a combustion space through the main passage based on position of an intake valve. The idle air passage is integrally formed in the throttle valve body, and is controlled by a motor to selectively introduce air into the main passage downstream of the throttle plate. For a cylinder hole diameter in the range from 70 mm to 74 mm, both the intake valve angle defined between the intake valve axis and the cylinder axis and the exhaust valve angle defined between the exhaust valve axis and the cylinder axis are in the range from 11 degrees to 15 degrees.