- Wear
- The progressive loss of substance from the operating surface of a body occurring as a result
of relative motion at the surface; rubbing away.
Also see
- Wear bars
- Raised portions of rubber that make up me tread of the tire, separated by grooves that are arranged laterally, providing traction in the forward or rearward direction.
- Wear-in
- As the piston slides up and down the cylinder of a new engine, the rings rub against the rough cylinder walls. The roughness smooths out in time so that a near perfect fit is achieved. Also called broken-in.
- Wear indicator
- A projection on the inner brake pad that contacts the disc and creates a squealing noise when pad replacement is necessary. Gradually being replaced by an electrical sensor that illuminates a warning lamp.
- Wear ring
- A ring on a pump used to prevent costly wear of the casing and impeller at the running joint. It is secured to both the casing and the impeller
- Weather caulking
- Any of several kinds of crack-filling material around any windows or doors to the outside used to reduce the passage of air and moisture around moveable parts of a door or window. Weather stripping is available in strips or rolls of metal, vinyl, or foam rubber and can be applied on the inside or outside of a building.
- Weathering
- The change in appearance of paint caused by exposure to the elements. The physical
disintegration and chemical decomposition of materials on exposure to atmospheric agents.
Also see
- Weather resistant
- The ability to withstand natural climatic conditions which cause surface deterioration
- Weatherstrip
- A rubber seal fitted to the body, e.g., along a door aperture or trunklid, to prevent water, air,
and moisture from getting into the interior of the body.
Also see
- Weather stripping
- Any of several kinds of crack-filling material around any windows or doors to the outside used to reduce the passage of air and moisture around moveable parts of a door or window. Weather stripping is available in strips or rolls of metal, vinyl, or foam rubber and can be applied on the inside or outside of a building.
- Web
-
- An internal reinforcement between panels.
- A Crank web.
- A supporting structure across a cavity.
Also see
- Webbing grabber
- A device in an inertia reel seat belt that grips the belt webbing tightly in the event of sudden braking or impact
- Weber carburetor
- A well-known Italian brand, used on many high-performance Italian, German, and other vehicles during its heyday. Weber carburetors were famous for their adjustability
- Wedge
-
- Engine using wedge-shaped Combustion chamber. The Combustion chambers are flatter on one end than the other.
- A simple machine consisting of a triangular shaped block, that can be forced into a gap, giving a greatly increased force.
Also see
- Wedge block
- Combustion chamber design in which the top of the piston and the surface of the block form an angle
- Wedge combustion chamber
-
A Combustion chamber using a Wedge shape. It is quite efficient and lends itself to mass production and as a result is widely used. The valve is in the longer sloping surface and the spark plug in the shorter; the tapered part of the wedge forms a squish zone. The squish produces swirling turbulence as the piston forces the mixture away from the narrow area of the wedge. Turbulence keeps the fuel and air mixed thoroughly for even burning. Squish also cools the mixture in the corners to reduce hot spots. It has a short Flame path which reduces the tendency of the burning fuel to knock or pre-ignite.
Click image to supersize
Wedge combustion chamberAlso see
- Wedge expander
- A part of a mechanical drum brake system which forces the shoes apart into contact with the drum
- Weep
- Fluid leakage which stains the outside of the container, but does not actually drip. Generally oil weeping is not a serious problem.
- Weighbridge
- A device for measuring the weight of vehicles (especially trucks), consisting of a metal plate set into the road surface
- Weight
-
- The force of gravity acting upon a body. It is measured in Newtons.
- The mass of an object under the influence of gravity. Unlike mass, the weight changes with the location of the object. As the force of gravity is relatively constant on earth, we use the terms weight and mass interchangeably.
Also see- Absolute Weight
- Adhesive Weight
- Advance weight
- Axle weight
- Balance weight
- Basic Weight
- Cargo weight
- Centrifugal weight
- Chassis Weight
- Clip-on weight
- Counterweight
- Curb weight
- Distributor weight
- Dry weight
- Flyweights
- Governor weight
- Gross axle weight rating
- Gross combination weight
- Gross Combined Weight Rating
- Gross train weight
- Gross vehicle weight
- Gross Vehicle Weight Rating
- Horsepower-weight factor
- Kerb Weight
- Lead weight
- Licensed Weight
- Mass
- Maximum trailer weight
- Molecular weight
- Power-to-weight ratio
- Shipping Weight
- Sliding weight
- Sprung weight
- Straight weight
- Tare weight
- Tongue weight
- Troy weight
- Unladen weight
- Unsprung weight
- Weightlessness
- Wheel weight
- Weight bias
- An element of vehicle design that results in either the front or rear suspension having to support more than half of the vehicle's weight. Most cars have a forward weight bias.
- Weigh-In-Motion
- (WIM) Technology for determining a vehicle's weight without requiring it to come to a complete stop.
- Weightlessness
- A condition when an object is in free fall. It does not mean that the object is completely out of the Earth's gravitational Field.
- Weight per unit area
- An indication of the thickness of metallic paint coatings in grams per square meter of surface area
- Weight transfer
- The transfer of load from one end or side of the vehicle to the other when accelerating, braking, or cornering
- Weight transfer effect
- Because the center of gravity of a vehicle is located above the centers of wheel rotation, a sudden stoppage of the vehicle tends to cause the center of gravity to move forward, thus throwing more weight onto the front wheels and less on the rear wheels
- Weissach axle
- A special double wishbone rear suspension developed by Porsche for the 928S to minimize the problems of oversteering
- Welch plug
-
- A concave disk generally about 10 mm (3/8 inch) diameter used to plug a hole in a Carburetor.
- A Core plug
- Weld
- To join two pieces of metal together by raising the area to be joined to a point hot enough for the two sections to melt and flow together. Additional metal is usually added by melting small drops from the end of a metal rod while the welding is in progress.
- Welder
-
A device used to Weld (usually) two pieces of metal
Welder
- Welding
- Art of fastening metals (or plastic) together by means of interfusing them. They are heated to a
suitable temperature. In some cases pressure is used to bond them together. In other cases a filler
material (solder) is used to join them. Among the approximately 40 different welding methods, the
resistance welding processes, and especially spot welding, are most relevant for automobile production,
whereas arc welding methods are most relevant for servicing and repair.
Also see
- Arc welding
- Automatic Arc Welding
- Automatic welding
- Back-step welding
- Backhand welding
- Braze welding
- Carbon-arc Welding
- Carbon-dioxide Welding
- Electric Welding
- Flat position welding
- Forward welding
- Friction welding
- Gas metal-arc welding
- Gas tungsten-arc welding
- Gas welding
- Hammer welding
- Heated tool welding
- Hot gas welding
- Inert arc welding
- Inert gas-arc welding
- Leftward welding
- Metal Inert Gas Welding
- MIG welding
- Oxygen-acetylene welding
- Percussion welding
- Plastics welding
- Plug welding
- Projection welding
- Pulse arc welding
- Resistance welding
- Spot welding
- Tack welding
- TIG welding
- Ultrasonic welding
- Welding clamp
- A locking clamp with U-shaped jaws (which allow more visibility and working space), used to hold panels, bars, tubes, etc. for welding
- Welding hammer
-
A special type of tool with high tensile strength head and a spring handle (to reduce shock/vibration) used to chip excess slag and splatter during welding process. It has a blade at one end and a point at the other. Also called straight head chipping hammer
Welding hammer
- Welding jig
- A special type of frame gauge used to establish the correct position of structural parts on the body prior to welding them in
- Weld Screw
- Projection welding applied to screws offer a means of providing attached treated members in sheet metal construction. Welding lugs on the head of the screw reduce the amount of current required for surface welding and provide fusion of metal at predetermined points.
- Weld-through primer
- A special paint used along spot welds or seams; it does not burn off during welding and thus offers good protection on the back of welded panels that would normally be inaccessible once welding is completed
- Well-base rim
- A wheel rim with a central channel or recess into which one side of the tire bead can drop; the other side can then be forced over the rim for fitting or removal. Wheels with well-base rims are commonly used on passenger cars because they enable easy installation and removal of the tire; the seats of the rim on which the tire sits (rim flanges) have a 5° taper so that, as the tire is inflated, the beads are forced up the taper to give a wedge fit and a good seal for tubeless tires; safety bead seats must also be incorporated, however
- Welting
- Piping -- a rubber or plastic strip inserted between two removable panels, i.e., between a bolt-on fender and the body, to cover up the joint and to prevent water getting in; with the piping inserted, only the round bead along the upper edge of the piping is visible
- W-engine
- A rare engine design, basically similar to a V-engine, but using three instead of two cylinder rows. The W-engine is less perfectly balanced than a V-engine, but this is compensated by balancer shafts; the main advantage of the W-engine is its short crankshaft which results in a very short block; the compact construction permits a 12-cylinder W-engine to be installed transversely in a mid-engine sports car
- Wet boiling point
- The Boiling point of
Brake fluid when it has absorbed some water.
Also see
- Wet bulb
- Device used in measurement of relative humidity. Evaporation of moisture lowers temperature of wet bulb compared to dry bulb temperature of same air sample.
- Wet bulb hygrometer
- Instrument for measuring the relative humidity of atmospheric air. Also called psychrometer.
- Wet bulb temperature
- Measure of the degree of moisture. It is the temperature of evaporation for an air sample.
- Wet cell battery
- Cell or connected group of cells that converts chemical energy into electrical energy by reversible chemical reactions.
- Wet friction
- Wet friction exists when the rubbing parts have some other substance between them such as oil or grease. Opposite to Dry friction.
- Wet galvanizing
- A galvanizing method in which the flux is deposited in molten form on the zinc bath, and the metal to be galvanized is introduced into the bath by passing it through this layer of flux
- Wet liner
- A Cylinder sleeve application in which the
water in the Cooling system contacts a major
portion of the sleeve itself.
Also see
- Wet motor
- A pump whose motor compartment is filled with liquid; submersible pumps are generally classified as wet motor types
- Wet natural gas
- A mixture of hydrocarbon compounds and small quantities of various nonhydrocarbons existing in the gaseous phase or in solution with crude oil in porous rock formations at reservoir conditions. The principal hydrocarbons normally contained in the mixture are Methane, ethane, Propane, Butane, and Pentane. Typical nonhydrocarbon gases that may be present in reservoir natural gas are water vapor, carbon dioxide, hydrogen sulfide, nitrogen and trace amounts of helium. Under reservoir conditions, natural gas and its associated liquefiable portions occur either in a single gaseous phase in the reservoir or in solution with crude oil and are not distinguishable at the time as separate substances. Note: The Securities and Exchange Commission and the Financial Accounting Standards Board refer to this product as natural gas.
- Wet-on-wet application
- A paint application by which a second coat of paint is applied over a first coat before it is dried or stoved; in the case of metallic paint systems, the clear coat is applied over the wet base coat
- Wet sanding
- Sanding with wet-and-dry sandpaper that has been wetted with water to prevent the paper from clogging; commonly used for final sanding
- Wet setting
- The addition of the float with the carburetor mounted on engine and the float bowl full of fuel
- Wet sleeve
- A Cylinder sleeve application in which the
water in the Cooling system contacts a major
portion of the sleeve itself. The sleeve is supported by the block only at the top and bottom of the
sleeve. The sleeve must be thicker than a Dry sleeve.
Also see
- Wet sump lubrication
- The usual engine lubrication system in which the oil is carried in a pan below the crankshaft. Such a system relies on gravity draining the circulated oil and needs no return pump
- Wetting
- The ability of an adhesive, coating or sealer compound to wet or adhere to a surface immediately on contact even when the film is extremely thin.