A vehicle engine 2 comprises an exhaust system having an exhaust manifold 12 and an exhaust purification device 18. The exhaust manifold 12 is disposed at a predetermined distance from a dash panel 106 constituting a body of the vehicle 100, the exhaust purification device 18 is disposed in a position overlapping a floor tunnel region 114, formed by a floor tunnel of the body, and is disposed below the exhaust manifold 12 and to one side of the center of the engine 2 in the cylinder-array direction, as viewed from the longitudinal direction of the vehicle 100. An exhaust purification device introduction passage 17 connecting the exhaust manifold 12 and the exhaust purification device 18 is disposed on the other side of the center of the exhaust manifold 12 in the cylinder-array direction, and extends below the exhaust manifold 12 to be connected to the exhaust purification device 18.

Operating a drive train of a vehicle with a clutch unit for distributing torque on a primary axis and a secondary axis of the vehicle comprises: a) determining an available drive torque; b) determining excess torque on the primary axis; c) determining an actual maximum torque on the secondary axis; d) determining the excess torque on the secondary axis insofar as the maximum torque is not exceeded.

Operating a drive train of a vehicle with a clutch unit for distributing torque on a primary axis and a secondary axis of the vehicle comprises: a) determining an available drive torque; b) determining excess torque on the primary axis; c) determining an actual maximum torque on the secondary axis; d) determining the excess torque on the secondary axis insofar as the maximum torque is not exceeded.

A zero turning radius mower has an internal combustion engine mounted transversely on a pair of longitudinal frame members behind an operator seat and a pair of rear drive wheels. The engine rotates a flywheel on a horizontal axis perpendicular to the longitudinal frame members. A gearbox is mounted to one of the longitudinal frame members, with a horizontal input shaft driven by the engine and a vertical output shaft engaging one or more rubber belts. The same rubber belts drive a pair hydrostatic transmissions for the pair of rear drive wheels and a plurality of rotary mower blades under a mower deck.

A zero turning radius mower has an internal combustion engine mounted transversely on a pair of longitudinal frame members behind an operator seat and a pair of rear drive wheels. The engine rotates a flywheel on a horizontal axis perpendicular to the longitudinal frame members. A gearbox is mounted to one of the longitudinal frame members, with a horizontal input shaft driven by the engine and a vertical output shaft engaging one or more rubber belts. The same rubber belts drive a pair hydrostatic transmissions for the pair of rear drive wheels and a plurality of rotary mower blades under a mower deck.

A zero turning radius mower has an internal combustion engine mounted transversely on a pair of longitudinal frame members behind an operator seat and a pair of rear drive wheels. The engine rotates a flywheel on a horizontal axis perpendicular to the longitudinal frame members. A gearbox is mounted to one of the longitudinal frame members, with a horizontal input shaft driven by the engine and a vertical output shaft engaging one or more rubber belts. The same rubber belts drive a pair hydrostatic transmissions for the pair of rear drive wheels and a plurality of rotary mower blades under a mower deck.

A zero turning radius mower has an internal combustion engine mounted transversely on a pair of longitudinal frame members behind an operator seat and a pair of rear drive wheels. The engine rotates a flywheel on a horizontal axis perpendicular to the longitudinal frame members. A gearbox is mounted to one of the longitudinal frame members, with a horizontal input shaft driven by the engine and a vertical output shaft engaging one or more rubber belts. The same rubber belts drive a pair hydrostatic transmissions for the pair of rear drive wheels and a plurality of rotary mower blades under a mower deck.