- HO2S
- Acronym for Heated Oxygen Sensor -- Detects exhaust rich
or lean of oxygen of the following types:
- HO2S-1-1: Acronym for Bank One Sensor One Signal
- HO2S-1-2: Acronym for Bank One Sensor Two Signal
- HO2S-1-3: Acronym for Bank One Sensor Three Signal
- HO2S-2-1: Acronym for Bank Two Sensor One Signal
- HO2S-2-2: Acronym for Bank Two Sensor Two Signal
- Hog
-
- A colloquial term for a Harley Davidson motorcycle.
- A driver who persists in straddling both lanes at a slow speed so that it is
impossible to pass him.
Also see
- Hogging
- Straining of the ship that tends to make the bow and stern lower than the middle
portion
Also see
- 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
Hog ring
- Hoist
-
- A mechanism for lifting a whole vehicle or part of it.
- A lifting mechanism under cargo bodies that dump.
- 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
- 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-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
- 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 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
- Hole punch
-
- 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
- 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
- Holographic combiner
- A semi-reflecting layer embedded in laminated windshield glass; used for head-up displays
- 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.
- Homogenizer
- A mechanical device which is used to create a stable, uniform dispersion of an insoluble phase (asphaltenes) within a liquid phase (fuel oil).
- Homologation
- An official recognition of a special version of a standard car as a production model, to make it eligible for racing
- Honda
-
Click image for books on
Honda automobilesAn automobile and motorcycle manufacturer, Honda Motor Company, Limited in Japan which included the following automobiles:
Click image for books on
Honda motorcycles- Accord (1976-current)
- Acty (1977-current)
- Civic (1972-2008)
- CR-V (1997-2007)
- del Sol (1993-97)
- Element (2003-07)
- Fit (2007-08)
- HR-V (1995-2005)
- Insight (2000-06)
- Legend (1985-current)
- MDX (2003-06)
- NSX (1990-2005)
- Odyssey (1995-current)
- Passport (1994-2002)
- Pilot (2003-07)
- Prelude (1978-2001)
- Ridgeline (2006-08)
- S2000 (2000-07)
- Stepwgn (1996-current)
- Stream (2000-current)
- Hone
-
- To remove metal with a fine grit abrasive stone in order to meet precise Tolerances.
- The device or tool which is rotated in a Cylinder to remove slight imperfections in the Cylinder wall.
- Honeybear
- Trucker slang for female county or state police officer as in "Just passed a honeybear in a tiajuana taxi takin' pictures".
- Hood
-
- 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.
- A British term for the roof of a convertible.
- 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 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 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 support stay
- A rod that is manually moved into place to keep the engine cover in an open position to facilitate engine compartment repairs
- Hood tape
- A fabric covered beading which keeps the hood on older cars from rubbing on the paint below them.
- Hook
- The curved, dropped section of a set of turned-down
Handlebars of a Bicycle.
See
- Hook Bolt
- A "bent bolt" having the unthreaded end bent to form a hook, such as a round bend, square bend, right-angle bend, or acute-angle bend hook bolt.
- Hooks
- The curved, dropped sections of a set of turned-down Handlebars of a Bicycle.
- Hooped
- A colloquial expression meaning damaged, out of order, or unrepairable as in Your engine is hooped.
- Hopper Bottom
- An open top cargo body capable of discharging its load through a bottom opening without tilting. Also called bottom dumps
- Horch
- On 14 November 1899, August Horch (1868-1951) established the A. Horch & Cie. company in the Ehrenfeld district of Cologne, Germany where 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. In 1932 Horch joined Audi. Models built between 1925 and 1932 models are classic cars.
- Horizontal axis wind turbine
- The most common type of wind turbine where the axis of rotation is
oriented horizontally.
Also see
- 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
- Horn
-
- Any opening chamber to intake air such as the entrance to a carburetor.
-
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.
Horn
Also see
- Horn boss
- A relatively large pad in the center 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.
- 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.
Horsepower Watts ||| KiloWatts Horsepower 1 745.7 ||| 1 1.3 2 1491.4 ||| 2 2.7 3 2237.1 ||| 3 4.0 4 2982.8 ||| 4 5.4 5 3728.5 ||| 5 6.7 6 4474.2 ||| 6 8.0 7 5219.9 ||| 7 9.4 8 5965.6 ||| 8 10.7 9 6711.3 ||| 9 12.1 10 7457 ||| 10 13.4 20 14914 ||| 20 26.8 30 22371 ||| 30 40.2 40 29828 ||| 40 53.6 50 37285 ||| 50 67.1 60 44742 ||| 60 80.5 70 52199 ||| 70 93.9 80 59656 ||| 80 107.3 90 67113 ||| 90 120.7 100 74570 ||| 100 134.1 200 149140 ||| 200 268.2 300 223710 ||| 300 402.3 400 298280 ||| 400 536.4 500 372850 ||| 500 670.5 600 447420 ||| 600 804.6 700 521990 ||| 700 938.7 800 596560 ||| 800 1072.8 900 671130 ||| 900 1206.9 1000 745700 ||| 1000 1341.0
- 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
- 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.
- Hose
- A flexible tube used to convey liquid. In most automobiles, hoses connected independent Components like the Radiator, Water pump, and Heater.
- 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 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 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 143°-149°C. This temperature allows uncured rubber to flow
in the matrix forming the tread design during vulcanization.
Also see
- 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 drive
- Hotchkiss suspension
- A live-axle Rear suspension in which
Leaf springs handle both the axle's springing and
its location.
Also see
- Hot dry rock
- Heat energy residing in impermeable, crystalline rock. Hydraulic fracturing may be used to create permeability to enable circulation of water and removal of the heat.
- Hot forging
- Heating metal to red-hot temperatures or temperatures above the recrystallization point to soften it before shaping a fastener. Hot forging is primarily used when the diameter of the metal is too large for cold forming or the quantity required is too small to economically set up a cold-forming machine.
- Hot Forming
- Working operation such as bending and drawing sheet and plate, forging, pressing, and heading, performed on metal heated to temperatures above room temperature.
- Hot Fuel
- Expanded diesel fuel or gasoline that is sold at retail pumps at temperatures higher than the century-old government standard of 15.5°C. At the 15.5°C standard, a gallon of fuel delivers a certain amount of measurable energy, or BTU. But when expanded by higher temperatures, that same amount of fuel actually delivers less energy. The warmer the fuel, the less BTU and fewer miles to the gallons a vehicle will receive.
- 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 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 in-place recycling
- Crews heat up and grind off the top few inches of pavement, which is thoroughly mixed with new material and put back down. This process, chiefly used on high-volume roads, creates a road bed that closely resembles a new road in consistency and strength.
- 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 Shot
-
- Colloquial term for a local freight hauler
- Colloquial term for a one ton truck equipped with a fifth wheel for pulling light weight trailers.
- 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 spot
-
- 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.
- 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 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 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
-
- The positive wire coming from the Battery or generating system.
- Resistance wire in an electrical relay which expands when heated and contracts when cooled.
- Electrical lead which has a voltage difference between it and the ground.
- 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 relay
- Heat-operated electrical control used to open or close a refrigeration system electrical circuit. This system uses a resistance wire to convent electrical energy into heat energy.
- Hours-Of-Service
- (HOS) A U.S. Department of Transportation safety regulations which govern the time of operation of commercial vehicle drivers engaged in interstate trucking operations.
- 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
- Household Goods cargo
- Truck cargo consisting of uncrated household or office furniture, band equipment, theatrical equipment, and trade show displays.
- Housing
-
- 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.
- A container or casing for mechanical components such as bearings, gears, etc.
Also see- Axle casing
- Axle housing
- Bearing housing
- Bell housing
- Brake Cable Housing
- Brake drum
- Camshaft housing
- Clutch housing
- Cylinder Housing
- Derailleur Cable Housing
- Differential housing
- Oil filter housing
- Rear axle housing
- Torque converter housing
- Transmission extension housing
- Transmission housing
- Turbine housing
- Valve body housing
- Wheel housing
- HOV
-
Acronym for high-occupancy vehicle -- A vehicle carrying two or more passengers used on marked commuter lanes. Examples include car pools, vanpools, buses, and mini-buses. Transportation systems may encourage HOV use by having designated HOV lanes.
HOV Sign
- Hovercraft
- A ground vehicle that is supported by a cushion of air to reduce Friction. As well as traveling on the land, hovercraft can travel on the sea or swampy terrain.
- HOV Lane
- High Occupancy Vehicle Lane -- Exclusive road or traffic lane limited to buses, vanpools, carpools, emergency vehicles, and in some cases, single occupant motorcycles. HOV lanes typically have higher operating speeds and lower traffic volumes than adjacent general purpose lanes. HOV lanes have proven to be successful in major metropolitan areas across the US; however, their full effectiveness is usually not realized until about one to two years after implementation.