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Haldex Clutch - Limited slip coupling used in vehicles with automatic all-wheel drive systems to engage and disengage a secondary axle when needed.
Hard Top - A removable top made from fiberglass or steel and usually painted the same color as the body of the car.
Head Room - The distance from the hip of a vehicles occupant to the vehicles interior rooftop.
Head Unit - The central control unit for a vehicles entertainment system.
Headlight Washers - A set of washer nozzles and/or wipers that clean a vehicles headlights.
Headlights - A pair of bright lamps that provide visibility during darkness.
Headsets - A pair of small speakers that, when placed close to a passengers ears, enables the passenger to listen to a vehicles sound system without disturbing other passengers.
Heads-Up Display - A digital display projected from a vehicles dashboard onto its windshield to provide information within the drivers direct line of sight.
Heated Air Temperature Sensor - A device that provides information needed by a vehicles computer to determine the temperature of the air coming into the engine.
Heated Mirrors - Sideview mirrors with internal electronic heating coils designed to prevent fog and ice from obstructing visibility.
Heater - A heat exchanger placed in the ventilation system that diffuses heat from the engines cooling system into an airstream generated by an inline fan.
Heater Hoses - Tubing that carries engine coolant between a vehicles cooling system and heater core.
Height - The distance between the tallest part of a vehicle and level ground.
Hemi - An engine with hemispherically shaped combustion chambers (the area of the engine where a mixture of fuel and air is burned to start the process of producing power). The shape allows for unobstructed movement of the air. The term is now a Chrysler trademark, although other companies have used similar designs.
Highway Fuel Economy - The average number of miles a vehicle is able to travel using one gallon of fuel according to EPA simulated laboratory tests of highway driving conditions.
Hill Holder - A device that applies brake pressure when a vehicles clutch is disengaged.
Hinge Pillar - The second and third pillars that the door hinges are attached to.
Hinge Type - The type of door hinge: standard, scissor, gullwing or suicide-style.
Hip Room - The distance from the drivers side lower door panel to the front passengers lower side door panel.
Homogeneous Charge Compression Ignition (HCCI) - An internal combustion engine in which gasoline and air are compressed to the point of auto-ignition.
Hood - The American term for engine cover. In England the hood is called a bonnet and a convertible top is called a hood.
Horseless Carriage - According to the Horseless Carriage Club of America, this term applies to vehicles built before 1915.
Horsepower - A measure of power. A unit of power equal to 550 foot-pounds per second (745.7 watts)
Hot Rod - A wide range of home made and backyard maintained vehicles from the 1930's through the 1970's.
Huffer - A supercharger
Hybrid Degree - The level of hybrid technology used for a vehicle: full, mild, power-assist or plug-in.
Hybrid Drivetrain Layout - The drivetrain layout in a hybrid vehicle: parallel, series or combined.
Hybrid Engine - A powertrain that combines an electric motor and an alternative means of propulsion and/or power generation (for example, hydrogen). A gas/electric hybrid engine is the most common example of a hybrid engine.
Hybrid Gas Engine Performance - A hybrid vehicles gasoline engines ability to do work, expressed in terms of horsepower or torque.
Hybrid Performance - A hybrid engine and electric motors combined ability to do work in terms of horsepower, torque or efficiency.
Hybrid Power Source - The source of power in a hybrid vehicle: gas/electric, plug-in, fuel cell or pneumatic.
Hybrid Vehicle - A vehicle that combines the use of internal combustion and electricity as power sources.
Hydraulics - A suspension system that uses oil-filled cylinders to raise or lower the vehicle's ride height. Its popularity with many custom car fans has been usurped by newer airbag suspensions. See also airbags.
Hydrocarbons - Organic compounds commonly used as a fuel source consisting of only hydrogen and carbon atoms.
Hydrogen Fuel Cell - An energy conversion device that produces electricity by means of electrochemical reactions between hydrogen and an oxidant.
Here is a list of various Automotive Definitions. These are not specific to just Classic Cars, but covers all Automotive Definitions in general. This is not an all inclusive list and as we come across more, we will add them here. Drop us a note if you see something we missed.
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