Four-wheel drive

Four-wheel drive, 4×4 ("four by four"), 4WD, and AWD is a form of drivetrain capable of providing power to all wheel ends of a two-axled vehicle simultaneously. It may be full-time, or on-demand, and may be linked via a transfer case to provide multiple gear ranges.

A four-wheeled vehicle with power supplied to both axles may be described as "all-wheel drive". However, not all "four-wheel drive" vehicles are "all-wheel drive", as vehicles with more than two axles may also be described as "four-wheel drive" regardless of how many axles, so long as two axles (of two wheel ends apiece) are powered.

Definitions

4WD/AWD systems were developed in many different markets and used in many different vehicle platforms. There is no universally accepted set of terminology to describe the various architectures and functions. The terms used by various manufactures often reflect marketing rather than engineering considerations or significant technical differences between systems.

4×4

Four-by-four (4×4) refers to the general class of vehicles. The first figure represents the total wheels (more precisely, axle ends, which may have multiple wheels), and the second, the number that are powered. Syntactically, 4×2 means a four-wheel vehicle that transmits engine power to only two axle-ends: the front two in front-wheel drive or the rear two in rear-wheel drive. Alternatively, a 6x4 vehicle has three axles, any two of which provide power to two wheel ends each. The number of wheels may be greater than six, as on ubiquitous ten-wheel tractor units, but the designation stays the same.

CSI: Crime Scene Investigation (season 5)

The fifth season of CSI: Crime Scene Investigation premiered on CBS on September 23, 2004 and ended May 19, 2005. The series stars William Petersen and Marg Helgenberger.

Plot

Greg begins his journey from a lab rat to a field mouse, as the Las Vegas Crime Lab faces a personnel overhaul ("Ch-Ch-Changes"), during the fifth season of CSI. The teams final days together are plagued with more investigations into the insane and the unusual, including the discovery of an alien corpse in Area 51 ("Viva Las Vegas"), a body washed up in a thunderstorm ("Down the Drain"), the kidnapping of a thirteen-year-old girl ("Harvest"), a death at a fumigation ("Crows Feet"), a swingers party ("Swap Meet"), the return of the Blue Paint Killer ("What's Eating Gilbert Grissom?"), and a kidnapping at a hotel ("Formalities"). It's the appearance of evidence mid-trail, however, that causes Ecklie to separate Grissom and Willows' team ("Mea Culpa"), with Catherine, Nick, and Warrick delving into cases such as brain death ("No Humans Involved"), a body in a car ("Who Shot Sherlock?"), a severed head containing a snake ("Snakes"), the death of a bear ("Unbearable"), and a murder involving sports betting ("Big Middle"). The loss of one of their own, however, offers to unite the team once again ("Grave Danger").

4x4 (film)

4x4 (Danish: Nordisk kvadrille) is a 1965 Nordic co-production drama film directed by Palle Kjærulff-Schmidt, Klaus Rifbjerg, Rolf Clemens, Maunu Kurkvaara and Jan Troell. It was entered into the 4th Moscow International Film Festival winning a Special Diploma.

Cast

References

External links

X4

X4, X-4 or x4 may refer to:

See also