- VI
- Acronym for Viscosity index
- Vibration arrester
- Soft or flexible substance or device which will reduce the transmission of a vibration.
- Vibration damper
- A round weighted device attached to the front of the Crankshaft to minimize the Torsional vibration.
- Vicat softening temperature
- The temperature at which a flat-ended needle of 1 mm2 circular cross section will penetrate a thermoplastic specimen to a depth of 1 mm under a specified load, using a selected uniform rate of temperature rise
- Vice
- A British spelling for a clamping device with adjustable jaws (usually mounted on a workbench) used to grip an object to be worked on. The American spelling is vise.
Also see
- Vigor
-
A model of automobile from Acura
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Vigor
- VIN
- Acronym for Vehicle Identification Number -- a unique combination of numbers and letters assigned by the manufacturer to each vehicle and appears on the vehicle's registration and title.
- Vintage car
-
- A vehicle built between 1916 and 1924 (inclusive)
- A car constructed in the period 1919-1930
- VIR
- Acronym for Valves-in-receiver unit which is found in some air conditioning systems
- Vis-a-vis
- A four-seater in which the two passengers faced the driver. Used around the turn of the century.
- Vis-Breaking
- A light thermal cracking process carried out on a fuel oil during the refining process to reduce product viscosity without blending.
- Viscoelastic materials
- The most characteristic features of viscoelastic materials are that they exhibit a time-dependent strain response to a constant stress (creep) and a time-dependant stress response to a constant strain (relaxation). In addition, when the applied stress is removed the materials have the ability to recover slowly over a period of time
- Viscosimeter
- A device used to determine the Viscosity of a given sample of oil. The
oil is heated to a specific temperature and then allowed to flow through a set orifice. The length of
time required for a certain amount to flow determine the oil's viscosity.
Also see
- Viscosity
-
- A measure of an oil's ability to pour or be thick. Every container of oil is marked with the viscosity of the oil. Straight weight (also called single viscosity or single weight) oil has a single number like 30 weight. A lower number means the oil is thinner and is particularly good for lower temperatures. A higher number is better for hotter temperatures. Multigrade (also called multiviscosity or multiweight) oil has two numbers like 10W40. When the temperature is low, a multigrade oil like 10W40 will act like a 10 weight oil; but when the temperature increases, it will act like a 40 weight. In this way, a multigrade oil is excellent for all-around driving.
- Comparative fluidity or stiffness of liquid adhesives, coatings, and sealers.
- Measurement of thickness of oil or its resistance to flow. Viscosity usually varies with temperature.
- Viscosity cup
- A special cup of conical shape with a calibrated bore at the bottom. When filled with paint, the paint will flow out at the bottom of the cup in a determined time. To adjust the viscosity, thinners are added to the paint until the cup contents flow out in the number of seconds indicated in the paint manufacturer's instructions
- Viscosity index
- (VI)
- A measure of how the viscosity of a liquid (especially oil) changes with temperature the higher the VI, the smaller the change of viscosity with temperature
- A measure of an oil's ability to resist changes in Viscosity when heated.
- Viscosity index improver
- An oil additive which reduces thinning at high temperature, thus improving the VI
- Viscous coupling
- A particular kind of fluid coupling in which the input and Output shafts mate with thin, alternately spaced discs in a cylindrical chamber. The chamber is filled with a viscous fluid that tends to cling to the discs, thereby resisting speed differences between the two shafts. Viscous couplings are used to limit the speed difference between the two outputs of a differential, or between the two axles of a car.
- Viscous coupling differential
- A limited-slip differential using viscous couplings as slip-inhibiting devices
- Viscous coupling unit
- (VCU). A unit fitted as standard to all Range Rovers across the center differential (not instead of it) automatically to effect locking of the differential when a significant speed difference between front and rear propeller shafts is sensed. Conceptually it comprises a cylinder attached to the rear prop shaft into which an extension of the front prop shaft is introduced. Discs are attached alternately to the front prop shaft and the inside of the cylinder so that they interleave very closely within the cylinder. The cylinder is sealed at both ends and is filled with a special silicone fluid which has the characteristic of markedly increasing its viscosity when stirred. Thus when one prop shaft rotates relative to the other one - the situation of front (or rear) axle wheel-spin - the fluid increases its viscosity enough to lock the shafts together. When relative rotation ceases the viscosity changes back to its original value and the shafts are unlocked. The viscous coupling unit (VCU) has the advantage of being automatic on both engagement and disengagement and its action is gradual and without shock-loading to the transmission.
- Viscous mode
- An operating condition in a viscous coupling with inner and outer parts rotating at different speeds, in which a torque is transmitted through the coupling, which corresponds to the value of the resultant shearing velocity
- Vise
- An American spelling for a clamping device with adjustable jaws (usually mounted on a workbench) used to grip an object to be worked on. The British spelling is vice.
Also see
- Visibility
- Good visibility means that there are no blind spots for the driver in being able to see the traffic around him and that he is able to see the road in dark or adverse conditions.
- Visor
-
- A movable, perforated part of a helmet, covering the face but permitting sight and speech through the perforations.
- The peak of a cap or helmet to shade the eyes from direct sunlight. Visors were also used above the Windshield for the same purpose.
- Viton-tipped needle
- Special inlet valve carburetor needle with a hardened-rubber tip. Viton-tipped needles are resistant to dirt and conform to the seat even at low sealing pressures
- Vitreous enamel
- A British term for Porcelain enamel. A glassy material obtained by melting a mixture of inorganic materials; this can then be applied in one or more layers on a metal surface to which it is firmly bonded after firing; typical automotive applications are for badges and trim.
- Vitreous enameling
- An application of a glass coating to a metal by covering the surface with powdered glass frit and heating it until fusion occurs