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Glossary of Automotive Terminology

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Glossary of automotive, recreational vehicle and motorcycle terminology.

Direct Drive Powertrain

In 5th gear, the drive shaft is directly engaged to the engine. In all other gears, the power is transmitted from the engine to the gears and then to the drive shaft. With a direct drive powertrain there is no loss of power between the engine and 5th gear thus providing more efficiency. Read More »

Drum Brakes

Contain two brake shoes inside a drum. As the cable is pulled (by squeezing a lever or stepping on the brake pedal), the shoes are forced to the outside of the drum causing friction that stops the bike. The clutch lever, located on the left handlebar, is squeezed whenever the clutch needs to be disengaged. Easing the clutch lever out ... Read More »

Fuel Injection

Fuel injection is an electronic system that increases performance and fuel economy because it monitors engine conditions and provides the correct air/fuel mixture based on the engine’s demand. Unlike a carburetor, which mixes fuel and air together before loading it into the cylinder intake port, fuel injection injects the fuel directly into the cylinder head enabling more precise control over ... Read More »

Gasoline

A viscous fluid refined from crude oil which is made up of fossilized plant and animal remains and burned in internal combustion engines. Read More »

Handling

A reference to a racecar’s performance with relation to the driver’s ability to control the car. Suspension, tires and air flow all contribute. Read More »

X Liter Engine

The total displacement of an engine expressed in liters. This is the total volume within an engine devoted to the combustion which produces power. Read More »

Off Boost

The condition that exists when a turbocharger is not producing power. If exhaust pressure is not sufficient to spin the turbine, the turbocharger goes off boost. Read More »