Cars - http://maxpages.com/carsinhistory/H

Hubcap: The cap that fits over the end of the wheel spindle to keep dust and water away from the wheel bearings and brakes. It is often a styling feature, but it also acts as a good container for keeping the lug nuts from being lost when changing tires. When a vehicle becomes stuck in the snow, it can also be used as a temporary shovel. Also called wheel cover. Also see moon.

Hublock: !!!.

Hubodometer: A register mounted on the axle hub which shows the distance the vehicle travelled. It is popular to record mileage for leasing of vehicles or tires particularly on trailers, since there is no other odometer present.

HUD: An acronym for "heads up display" which is a system of mounting gauges so that the read-out is shown on the windshield. In this way the driver does not have to take his eyes off the road to see how his vehicle is performing.

Hudson: The 1929 Series L is a classic car. All 1948-49 models are milestone cars. The 1951-54 Hornet models are milestone cars.

Humber: The 1925-1948 models with required application are classic cars.

Hurst six-speed shifter: !!!.

HVAN: Acronym for "Heavy Van" (e.g., Mitsubishi Canter).

Hwy: Abbreviation for "highway."

Hydraulic: 1. When a quantity of water, oil, or other fluid is forced along one end of a line, it also forces against the other end of the line. Because these fluids (unlike a gas) cannot be compressed, when they are forced into a smaller cylinder they multiply the amount of force. Thus a driver can apply a small amount of force on the pedal or lever and a great amount of force is applied to the brake. Used in power steering, clutches, and brake systems. 2. When used as a verb, it means that oil or excessive gasoline has entered the combustion chamber so that when compression takes place, the fluid cannot be compressed. Something has to give and it is usually the connecting rod that bends. It is found in the expression, "the engine hydrauliced."

Hydraulically-assisted Brakes: !!!.

Hydraulic assisted brakes: See brake booster.

Hydraulically-assisted clutch: !!!.

Hydraulic brakes: See brake booster.

Hydraulic assisted brakes: See brake booster.

Hydraulic jack: A device used to lift a vehicle by using hydraulic pressure.

Hydraulic lift: !!!.

Hydraulic lifter: See hydraulic valve lifter.

Hydraulic valve lifter: A lifter that uses hydraulic oil pressure to maintain no clearance between metal parts so that valve noise is reduced. Also it reduces wear on the valves and eliminates periodic valve adjustments.

Hydraulics: The study of pressure and flow in liquids. A hydraulic jack uses oil under high pressure to lift large objects more easily.

Hydrocarbon: (HC) A compound made up of hydrogen and carbon (e.g., gasoline, petroleum products, etc.). Hydrocarbons are also found when gasoline is burned in an engine and thus produce visible smog even though hydrocarbons make up only 0.1% of emissions.

Hydrocarbon engine: An engine using petroleum products, such as gas, liquefied gas, gasoline, kerosene, or fuel oil as a fuel.

Hydroelectric power: See hydro-electric power.

Hydro-electric power: Electricity produced by using the kinetic energy of water.

Hydrofoil: A vessel which skims the surface of the water and the shaped pieces on the bottom of the vessel which act like "water wings" to give it lift.

Hydrometer: A device to determine the weight of a liquid. It is used to test battery electrolyte and the percentage of coolant in the cooling system.

Hydroplaning: A phenomenon of driving when water builds up under the tire tread, causing it to lose contact with the road. Caused by speed, water depth, tread depth, and inflation pressure. Slowing down will usually restore normal tire contact with the road. Also called aquaplaning.

Hydropneumatic suspension: A suspension system which uses a gas and a liquid which are separated by a flexible bladder. The setup causes the suspension to maintain a preset height. Used in Citroën cars.

Hydrostatically inflate: To inflate with water instead of air. Also see liquid ballast.
Hypoid gear: A type of spiral bevel gear in which the drive pinion shaft is located below the center of the ring gear. This setup is used to lower the height of the driveshaft and thus lower the floor of the vehicle.

Hysteresis: The energy lost and not returned, when tire materials are subjected to stress in any direction. Lost energy is converted to heat through molecular interaction, and since rubber has poor thermal conductivity, internal temperatures of a tire can build up rapidly under repeated flexing.

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Page Updated Sun May 20, 2001 8:08pm EDT