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UAIB: Acronym for "Union of Automobile Importers in Bulgaria" (Bulgaria).

u-bolt: U-shaped bolt for attaching leaf springs to the axle.

u brake: Heavy-duty centerpull mountain bike brakes that affix to frame posts.

u-brake: Heavy-duty centerpull mountain bike brakes that affix to frame posts.

u brakes: Heavy-duty centerpull mountain bike brakes that affix to frame posts.

u-brakes: Heavy-duty centerpull mountain bike brakes that affix to frame posts.

u joint: See universal joint.

U-joint: Abbreviation for "universal joint."

Ukravtoprom: Acronym for "Association of Ukrainian Motor Vehicle Manufacturers."

ULC: Acronym for "Underwriter's Laboratories."

ULEV: Acronym for "Ultra Low Emission Vehicle Standards."

ULP: Acronym for "Ultra-Low Profile." A tire with a low aspect ratio

ultimate cornering force: The maximum steady-state cornering or side force generated by the tires when a vehicle is driven around a skidpad with the speed increased gradually until if it were increased further the vehicle would slide off course.

ultra Low Emission Vehicle Standards: (ULEV).

ultra 6: A freewheel designed to allow six cogs to fit into the space normally taken up by five.

ultra 7: A freewheel designed to allow seven cogs to fit into the space normally taken up by six.

ultraviolet rays: Energy waves that emanate from the electrodes and the welding flames of such a frequency that these rays are in the ultraviolet ray light spectrum.

umbrella: See valve umbrella.

unbalance: A condition of wheels which are not balanced.

undercoating: The material sprayed on the underside of the automobile, under the hood, trunk lid, etc. which is designed to deaden sound and prevent the formation of rust.

undercoat: All of the products used to prepare the surface to receive color coats (primers, surfaces, putties, sealers, etc.).

undercoats: See undercoat.

undercure: A condition in which the vulcaninzation or curing has not been adequate.

undercut: A depression at the toe of the weld which is below the surface of the base metal.

underinflation: Insufficient air pressure in a tire for the amount of load carried.

undersize tire: The use of a tire having insufficient carrying capacity for the load. Also replacing original-equipment tire size with a smaller size of sufficient capacity, thus reducing unladen weight.

under square engine: An engine in which the bore diameter is smaller than the length of the stroke.

under-square engine: An engine in which the bore diameter is smaller than the length of the stroke.

understeer: The tendency for a vehicle, when negotiating a corner, to turn less sharply than the driver intends. The front end wants to run wide in a turn. To correct this problem, the suspension needs to be stiffer in the front or softer in the rear. A front-engine vehicle has a natural tendency to plow straight ahead on turns (i.e., understeer) unless its suspension is adjusted to counteract it.

unibody construction: See unitized construction.

unicycle: A one-wheel cycle having pedals attached to the axle and a saddle attached to the upper end of the fork tubes.

united States Council for Automotive Research: (USCAR) an organization founded by Chrysler, Ford, and General Motors to strengthen the technology base of the domestic automotive industry through research and co-operation.

unitized construction: A type of body construction that doesn't require a separate frame to provide structural strength or support for the car's mechanical components. A unitized body can employ monocoque construction, or it can utilize strong structural elements as an integral part of its construction.

unit body: Unit body: Type of body/frame construction in which the body of the vehicle, its floor plan and chassis form a single structure. Such a design is generally lighter and more rigid than a vehicle having a separate body and frame.

universal joint: A flexible double-pivoted joint that allows driving power to be carried through two shafts that are at an angle to each other. It consists of two Y-shaped yokes and a cross-shaped member called the spider. The four arms of the spider are assembled into bearings in the ends of the two yokes. With the normal cross-and-two-yoke universal joint there is some change in speed when the driveshaft and the driven shaft are at an angle to each other. The change in speed occurs because the driven yoke and driven shaft speed up and then slow down twice with every revolution of the drive line. The greater the angle between the drive and driven shafts, the greater the speed variation. To eliminate this speed variation, which results in increased wear of the affected parts, constant velocity joints are used on many cars. In front drive vehicles, it is called the constant velocity joint. Also called "Hooke joint" or "cardan joint."

unladen weight: The actual weight of a vehicle or combination with no payload. See tare weight.

unleaded gas: Gasoline which has no tetraethyl lead. See lead free.

unleaded gasoline: See unleaded gas.

unloaded radius: See free radius.

unsprung weight: This refers to all parts of the vehicle that are not supported by the suspension system, wheels, tires, etc. Also see sprung weight.

updraft carburetor: A carburetor in which the air passes upward through the carburetor into the intake manifold.

uph: Abbreviation for "upholstery."

upholstery: (Uph) The fabric used to cover the seats and other panels.

upset: [1] A widening of the diameter through pounding. [2] Turning a vehicle over because of an accident.

upshift: Shifting to a higher gear. In Britain it is called "upward change."

upthrust: The upward force produced when an object is immersed in a liquid or gas.

upward change: A British term for shifting to a higher gear. In North America it is called "upshift"

USAC: Acronym for "United States Auto-Sound Challenge."

USB: Acronym for "Universal Serial Bus."

USCAR: Acronym for "United States Council for Automotive Research"

used vehicle: vehicle that has been previously owned or driven. Also called preowned.

 

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