Automotive Glossary

Automotive Glossary

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Uneven running of an engine, usually when the mixture is over rich.


Heating, ventilation and air conditioning.

HVLP (High Volume, Low Pressure)

Describes a paint gun that uses a high volume and low pressure of atomising air to apply material to a surface. This provides high transfer efficiency and lower overspray.


A hybrid vehicle is a vehicle that uses two or more power sources to move the vehicle. The term most commonly refers to hybrid electric vehicles (HEVs), which combine an internal combustion engine and one or more electric motors.

Hybrid vehicle

Vehicles that use both a traditional engine (combustion) and a rechargeable system (typically operated by a battery) to improve mileage, cause less pollution, and decrease need for fossil fuel.


A system for transmitting and modifying force by the use of a liquid. Consists of a pump, control devices, hydraulic lines and slave cylinders.

Hydraulic Brake

Brake actuated only by hydraulic pressure.

Hydraulic Clutch

A clutch, operated by fluid pressure.

Hydraulic Hoses

Hoses that carry fluid under high pressure.

Hydraulic Lifters

Hydraulic cam followers in the valve opening mechanism.

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