DICTIONARY OF AUTOMOTIVE TERMS - "Ho"

Hog:

1. A colloquial term for a Harley Davidson motorcycle.
2. A driver who persists in straddling both lanes at a slow speed so that it is impossible to pass him. See road hog

Hogging:

Straining of the ship that tends to make the bow and stern lower than the middle portion
Also See:
Sagging

Hog ring:

A C-shaped wire used to secure a vehicle's seat upholstery to the metal frame of the seat. Also called "cushion clip"

Hoist:

See:
chain hoist
engine hoist

Hoisting rope:

Flexible wire rope for lifting purposes, generally being of six strands with 19 wires in each strand and in most cases having a hemp rope at the center. Also called wire rope

Hold:

The large spaces below deck for the stowage of cargo.
Also See:
intermediate hold

Holdback:

A mark-up of a certain percentage that the dealer pays the manufacturer on each new car that is added to his stock; this amount is rebated to the dealer after the car is sold

Hold ceiling:

A covering usually of wood, placed over the tank top for its protection

Hold cycle:

Maintaining steady hydraulic pressure during an ABS stop

Hold-down:

A spring tension mechaism that holds a brake shoe against a backing plate

Hold down clamp:

See:
battery hold down clamp
distributor hold-down clamp

Hold-down clamp:

See:
battery hold down clamp
distributor hold-down clamp

Hold-down pin, spring and retainer:

The most common method of retaining a brake shoe to the backing plate. The pin passes through the backing plate and brake shoe. The spring and retainer are fastened to the pin, which holds the shoe against the backing plate

Holder:

See:
beverage holder
bit holder
brush holder
bulb holder
coin holder
cup holder
glass holder
tap holder

Hold fitting:

See:
air hold fitting

Hold-in coil:

A separate relay coil, such as the hold-in winding in a starter solenoid, which is energized by contacts that close when the relay pulls in, to hold the relay in its energized position after the original operating circuit has been broken. Also called "holding coil."

Holding:

See:
road holding

Holding coil:

A separate relay coil, such as the hold-in winding in a starter solenoid, which is energized by contacts that close when the relay pulls in, to hold the relay in its energized position after the original operating circuit has been broken. Also called "hold-in coil."

Holding winding:

A part of a relay designed to hold it in the on-position. Compare pull-in winding. Also called "hold-in winding."

Hold-in winding:

A part of a relay designed to hold it in the on-position. Compare pull-in winding. Also called "holding winding."

Hold-off valve:

A unit which permits free fluid flow in either direction when the brakes are not applied, but prevents pressure buildup in one part of the brake system until pressure in the other part reaches a predetermined value.
Also See:
metering valve

Hold-open:

See:
door hold-open spring

Hold-open spring:

See:
door hold-open spring

Hold out:

The ability of a surface to keep the top layer of paint from sinking in or being absorbed

Hole:

See:
access hole
bolt hole
countersunk hole
cubby hole
drain hole
limber hole
oil filter hole
pilot hole
radiator fill hole
spurt hole
squirt hole
stud hole
valve hole
wheel bolt hole

Hole circle:

See:
wheel bolt hole circle.

Hole cutter:

See:
variable hole cutter

Hole cutting snips:

Snips with pointed cutting blades for cutting holes in sheet metal material

Hole plug:

See:
core hole plug

Hole punch:

1. A tool like pliers used in autobody repair to form holes along the edge of a repair panel; the panel can then be plug-welded to the substructure at these holes
2. A tool for poking holes in leather and fabric

Holesaw:

A cylindrical-shaped saw for use with power tools, for cutting holes in sheet metal material, e.g., in car bodies for installation of aerials

Hole theory:

Assumption that movement of a free electron from atom to atom leaves a hole in the atom it left, which is filled by another free electron

Hollowing:

The action of forming a deeply crowned panel from a piece of sheet steel on a hollowing block or a shot bag, using special mallets and hammers

Hollowing block:

A shaped wooden block on which a desired shape is produced by hammering

Holographic combiner:

A semi-reflecting layer embedded in laminated windshield glass; used for head-up displays

Home:

See:
limp home
mobile home

Holiday:

A void or hole in an adhesive or coating film, whether microscopic or normally visible

Hollow-tube gasket:

Sealing device made of rubber or plastic with tubular cross-section.

Homofocal headlight:

A type of headlight with two reflectors, the inner one has a shorter focal length than the main one

Homogeneous:

Being of a similar nature. Homogeneous liquids blend together completely; no part of either liquid remains separate.

Homokinetic joint:

See:
constant velocity joint

Homologation:

An official recognition of a special version of a standard car as a production model, to make it eligible for racing

Honda:

An automobile and motorcycle manufacturer in Japan
Click image for books on Honda

Honda Accord:

A model of automobile manufactured by Honda
Click image for books on Honda Accord

Honda Civic:

A model of automobile manufactured by Honda
Click image for books on Honda Civic

Honda CRX:

A model of automobile manufactured by Honda
Click image for books on Honda CRX

Honda Del Sol:

A model of automobile manufactured by Honda
Click image for books on Honda Del Sol

Honda Passport:

A model of automobile manufactured by Honda
Click image for books on Honda Passport

Honda Prelude:

A model of automobile manufactured by Honda
Click image for books on Honda Prelude

Honda S2000:

A model of automobile manufactured by Honda
Click image for books on Honda S2000

Hone:

1. To remove metal with a fine grit abrasive stone in order to meet precise tolerances.
2. The device or tool which is rotated in a cylinder to remove slight imperfections in the cylinder wall.

Also See:
cylinder hone

Honeybear:

Trucker slang for female county or state police officer as in "Just passed a honeybear in a tiajuana taxi takin' pictures."

Honeycomb:

A pattern of hexagonal shapes, like bees' cells.
Also See:
ceramic honeycomb

Honing:

The precision machining process used to resurface bores and shafts

Honing stone:

A tool used for the final smoothing operation, e.g., when repairing a cylinder wall

Hood:

1. The part of the vehicle body which covers the top of the engine in front engine vehicles. In mid-engine cars the panel which conceals the engine is called the "engine cover" or access panel. In rear-engine cars the panel which conceals the engine is called a "deck lid."
2. A British term for the roof of a convertible.

Also See:
fabric hood
hydraulic hood
power hood

Hood badge:

An emblem reflecting the name or logo of the car manufacturer and is secured to the front end of the hood. Some are bolted or pasted flat to the front, others stand upright on fixed or pivoting rods.

Hood bar:

A British term for one of at least four struts that support a roof. Usually made of tubular or sheet steel

Hood bow:

A British term for one of at least four struts that support a roof. Usually made of tubular or sheet steel

Hood bump rubber:

A thick rubber strip which is secured to the vertical panel on which the hood is lowered

Hood bumper:

See:
hood bump rubber

Hood landing panel:

The panel on which the hood is lowered. It also houses the hood locking mechanism

Hood liner:

A material secured to the underside of the hood to provide sound insulation. It is usually made of polyethylene, polypropylene, polyurethane, or a fabric of polyester

Hood lock:

A mechanism which is made of a peg on the front end of the underside of the hood and a sliding latch on the panel above the radiator. The sliding latch is released by a lever under the hood or by a lever under the dash in the passenger compartment.
Also See:
hood release

Hood pin:

A pin designed to hold a hood closed.

Hood pin kit:

A pair of hood pins and brackets which secure the hood of competition cars and "would-be" competition cars

Hood pins:

Pins designed to hold a hood closed.

Hood release:

A device which releases the hood lock. The trigger, located under the dash in the passenger compartment, is attached to a cable which controls the hood lock.

Hood rod:

A bar or rod which keeps the hood in an open position. The rod is located under the hood. Once the hood is raised, the rod is swung upright and the free end is placed in a notch or hole in the hood to keep it in place

Hood stick:

An old British term for hood bar

Hood tape:

A fabric covered beading which keeps the hood on older cars from rubbing on the paint below them.

Hooke joint:

See:
cardan joint.

Hooke universal:

See:
cardan joint.

Hook:

The curved, dropped section of a set of turned-down handlebars of a bicycle.

Hooks:

The curved, dropped sections of a set of turned-down handlebars of a bicycle.

Hook up:

1. To connect.
2. To meet with someone.

Hooligan bike:

See:
street fighter

Hooped:

A colloquial expression meaning damaged, out of order, or unrepairable as in Your engine is hooped.

Hop:

See:
wheel hop.

Hopping:

See:
code hopping

Hopping up:

Increasing engine performance through various modifications.

Horch:

On 14 November 1899, August Horch (1868-1951) established the company A. Horch & Cie. in the Ehrenfeld district of Cologne, Germany. Here he developed his first car, which was completed at the beginning of 1901. The company moved to Reichenbach in Saxony in March 1902 and converted to a share-issuing company two years later. On May 10, 1904, A. Horch & Cie. Motorwagen-Werke AG was established in Zwickau. The 1925-1948 models are classic cars.

Horizontal:

Lying flat, not upright

Horizontal adjuster:

A screw for adjusting the lateral aim of the headlight beam

Horizontal draft carburetor:

See:
side draft carburetor

Horizontal draught carburetor:

See:
side draft carburetor

Horizontal keiretsu:

A keiretsu system where the keiretsu member companies have shareholdings in each other. The opposite is vertical keiretsu. The member companies own relatively small chunks of shares in one another and are each centered on a core bank; the keiretsu system helps insulate company managements from stock market fluctuations and take-over attempts, allowing long-term planning and engagement in innovative projects; it is a key element of the automotive industry in Japan

Horizontally opposed engine:

An engine possessing two banks of cylinders that are placed flat or 180 degrees apart. This configuration gives a lower center of gravity which improves handling. As well it has a lower hood height to improve aerodynamics. Also called a "boxer" engine.
Also See:
flat engine

Horizontal position:

A weld performed on a horizontal seam at least partially on a vertical surface.

Horn:

1. Any opening chamber to intake air such as the entrance to a carburetor.
2. A device for sounding an alarm. On some entry level vehicles, a single horn makes a high pitch beep. On more expensive vehicles, the sound is made with two or more horns. The sound is made by an electrical charge which activates and deactivates a coil. The sound is then magnified by the shape of the horn. Large truck horns make a very loud noise because the sound is made by passing compressed air through the sounding device. A Claxton horn makes a sound that resembles the word "A-hoo-gah."

Also See:
air cleaner horn
air horn
blast horn
bull horn
bumper horn
claxton horn
dual-tone horn
ocean liner blast horn
overrider
two-tone horn

Horn boss:

A relatively large pad in the centre of the steering wheel which sounds the horn when you press on it

Horn button:

A relatively small button on the steering wheel or the end of the signal light lever which sounds the horn when you push on it

Horn rim steering wheel:

A steering wheel which had a thin metal strip on the inside of the rim. When the steering wheel was squeezed, the horn sounded.

Horn ring:

A thin chrome ring which was smaller than the steering wheel which sounded the horn when pressed. This style was found on older vehicles.

Horn switch:

An electrical device which engages the horn.

Horsepower:

(HP) A measurement of the engine's ability to perform work. One horsepower is defined as the ability to lift 33,000 pounds one foot in one minute. To find horsepower, the total rate of work in foot pounds accomplished is divided by 33,000. If a machine was lifting 100 pounds 660 feet per minute, its total rate of work would be 66,000 foot pounds per minute. Divide this by 33,000 foot pounds per minute to arrive at 2 horsepower. In metric terms, it is the ability to raise 250 kilograms a distance of 30 centimeters in one second. It is also equal to 745.7 watts.
Also See:
brake horsepower
friction horsepower
gross laboratory horsepower
indicated horsepower
net horsepower
rated horsepower
road load horsepower
SAE gross horsepower
SAE horsepower
SAE net horsepower

Horsepower screw:

A screw in the cover of adjustable wastegates to vary the spring height, which adjusts boost pressure; screwing down adds HP but may destroy the engine

Horsepower weight factor:

See:
horsepower-weight factor.

Horsepower-weight factor:

The relationship between the total weight of the vehicle and the horsepower available. By dividing the weight by the horsepower, the number of pounds to be moved by one horsepower is determined. This factor has a great effect on acceleration, fuel consumption, and all around performance.

Horseshoe clip:

Horseshoe clip

A wire spring retainer used to secure an inside door handle in place.

Hose:

A flexible tube used to convey liquid. In most automobiles, hoses connected independent components like the radiator, water pump, and heater.
Also See:
acetylene hose
braided hose
brake hose
overflow hose
radiator hose shark tooth pliers
radiator hose
vacuum hose

Hose clamp:

An adjustable metal ring, wire, or band placed around a hose where it connects to a metal pipe, to prevent leaks and to keep the hose in place. Hose clamps are tightened in one of three ways. In single wire clamps, it is tightened by spring tension of the clamp. In worm-gear clamps, by a worm screw. In strap-and-bolt clamps, by a screw. The British term is "hose clip."

Hose clamp installer:

A special tool for the installation of ear-type clamps, used e.g., on some types of CV joint boots, filters, cooling systems, and vacuum lines

Hose clamp pliers:

A special tool used to remove and install hose clamps

Hose clamps:

See:
hose clamp

Hose clip:

A British term for hose clamp

Hose clip installer:

British term for hose clamp installer

Hose clip pliers:

British term for hose clamp pliers

Hose pinch-off pliers:

A special tool to pinch off hoses when servicing the cooling system; pivoting jaws squeeze hoses shut so there is no need to drain the system

Hot:

Connected to the battery positive terminal, energized

Hot cap:

The conventional method of retreading in which uncured rubber is added to a buffed casing and cured in the mold at temperatures of approximately 290°-300°F. This temperature allows uncured rubber to flow in the matrix forming the tread design during vulcanization.
Also See:
cold cap

Hotchkiss:

A brand of vehicle of which the 1925-1948 models, with required application, are classic cars.

Hotchkiss drive:

The method of connecting the transmission output shaft to the differential pinion by using open driveshafts. The driving force of the rear wheels is transmitted to the frame through the rear springs or through link arms connecting the rear axle housing to of the vehicle. Combines both steering axis and camber angles.

Hotchkiss suspension:

A live-axle rear suspension in which leaf springs handle both the axle's springing and its location.
Also See:
hotchkiss drive.

Hot dip:

To coat metal parts by immersion in molten metal, such as tin or zinc

Hot-dip aluminizing:

The deposition of aluminium coatings by hot dipping

Hot-dip galvanize:

To apply a zinc coating by hot dipping

Hot gas:

The state of the refrigerant between the compressor and the condenser

Hot gas bypass:

Piping system in refrigerating unit which moves hot refrigerant gas from condenser into low-pressure side.

Hot gas defrost:

Defrosting system in which hot refrigerant gas from the high side is directed through evaporator for short period of time and at predetermined intervals, in order to remove frost from evaporator.

Hot gas welding:

A welding process involving the joining of thermoplastic materials by softening with a jet of hot air, then joining them at the softened points

Hot grip:

Electrically heated handlebar grips used on snowmobiles

Hot hatch:

High-performance hatchback

Hot idle compensator:

A small air valve that allows fresh air to enter the manifold and lean the mixture when the engine is hot

Hot junction:

That part of thermoelectric circuit which releases heat.

Hot lash:

The valve adjustment on a engine equipped with solid lifters

Hot plug:

A spark plug which has a long insulator nose which absorbs more heat and dissipates heat slowly. A colder plug is used in a hot engine while a hot plug is used in a cold engine. Thus if the plugs are fouling too much, try a hotter plug. If the plugs are coming out white, try a colder plug. The ideal color of the center insulator nose should be a light chocolate brown.

Hot rod:

A production car that has been modified by the owner in the attempt to increase acceleration and top end speed. Although the term can be applied to any modified car, it is usually reserved for vehicles produced from 1930 to 1940's. Typically the engine is modified, and some body panels removed. Many were painted with a design of flames behind the front wheels to give the appearance that this vehicle was "hot" -- thus the name.

Hot soak:

Occurs when the engine is topped during hot weather or after it has been run long enough to be fully warmed up; also the period during which the phenomenon known as percolation occurs

Hot spark plug:

See:
hot plug

Hot spot:

1. Refers to a comparatively thin section or area of the wall between the intake and exhaust manifold of an engine, the purpose being to allow the hot exhaust gases to heat the comparatively cool incoming mixture.
2. Also used to designate local areas of the cooling system which have above average temperature.

Hot spraying:

A spray process in which paint is preheated in a paint container so that its viscosity is reduced and it can be atomized without being diluted with a solvent

Hot start:

The starting of a hot engine may be difficult if it has been stopped for a few minutes; the accumulation of gasoline vapor in the air filter and inlet manifold, caused by the rise in engine temperature when left standing when hot, can be dissipated by slowly pressing the accelerator right down and turning the engine over until it fires

Hot start enrichment:

A fuel mixture enrichment when starting a hot engine

Hot starting:

See:
hot start

Hot-start pulse relay:

A fuel injection component which operates the cold-start valve intermittently to improve starting when the engine is hot; installed in the cold-start valve circuit in some CIS-equipped engines

Hot water and low-pressure steam boiler:

A boiler furnishing hot water at pressures not more than 30 psi gauge (308 kPa) or steam at pressures not more than 15 psi gauge (205 kPa)

Hot water heating system:

System in which water is circulated through heating coils.

Hot water vacuum valve:

A vacuum actuated valve which controls the flow of coolant through the heater core

Hot wax:

Wax-based material used for hot-wax flooding

Hot-wax flooding:

A special cavity-sealing process developed by Volkswagen, which uses a solvent-free wax injected into the cavities of bodies preheated to 60°C

Hot-wax flooding unit:

A device for hot-wax flooding consisting of a preheating zone, a flooding zone and a drip-off zone

Hot wire:

1. The positive wire coming from the battery or generating system.
2. Resistance wire in an electrical relay which expands when heated and contracts when cooled.
3. Electrical lead which has a voltage difference between it and the ground.
4. As a verb, it indicates the starting procedure when by-passing the ignition key and normal starting procedure.

Hot-wire airflow meter:

A constant-temperature hot-wire sensing device, used in electronic fuel injection systems, which measures the rate of a mass airflow into the engine by measuring the current needed to keep the hot wire at the same temperature

Hot-wire element:

An element in a hot-wire air-flow meter

Hot-wire sensor:

See:
air mass sensor

Hour capacity:

See:
ampere hour capacity

Hours-Of-Service:

A U.S. Department of Transportation safety regulations which govern the time of operation of commercial vehicle drivers engaged in interstate trucking operations.

House:

See:
deck house
full house
pilot house
wheel house

House bridge:

An erection fitted on the upper or superstructure deck of a ship. The officers' quarters, lounge are usually located in the bridge house

House panel:

See:
wheel house panel

Housing:

1. The outer sleeve through which a brake or gear cable is pulled. The housing transmits an equal push to counter the pull on the inner cable. Traditional housing consists of a tight spiral of steel wire, usually coated with plastic. Newer versions have synthetic liners to reduce friction.
2. A container or casing for mechanical components such as bearings, gears, etc.

Also See:
axle casing
axle housing
bearing housing
bell housing
brake drum
camshaft housing
clutch housing
converter housing
differential housing
oil filter housing
rear axle housing
rear axle housing, banjo type
rear axle housing, split type
torque converter housing
transmission extension housing
transmission housing
turbine housing
valve body housing
wheel housing

Housing banjo:

See:
axle housing banjo
rear axle housing, banjo type

Housing split:

See:
axle housing split
rear axle housing, split type

Hovercraft:

A ground vehicle that is supported by a cushion of air to reduce friction. As well as travelling on the land, hovercraft can travel on the sea or swampy terrain.

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