Capri Definitions

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A car that has an unbroken curved line from the top of the roof to the rear bumper as opposed to a drop in the line for a near-vertical rear window. In a fastback design the rear window slope follows the unbroken roof line and is often at less than a 45 degree angle.

    Feedback Fuel-Air-Ratio Control

A feature of a computer-controlled fuel system. By using a sensor to measure the oxygen content of the engine's exhaust, the system keeps the fuel-air ratio very close to the proportion for chemically perfect combustion. Such tight control of the fuel-air ratio is mandatory for the proper operation of three-way catalysts.


A composite material that relies on small glass fibers for its strength. Fiberglass is commonly found on aftermarket body panels. The factory body panels on third and forth generation Chevrolet Corvettes are made of fiberglass because of its light weight.

    Final Drive Ratio

The reduction ratio, found in the gearset of a drivetrain, that is furthest removed from the engine. Typically, the differential ratio.

    Fixed or One Price Selling

Published fixed price displayed on a new vehicle eliminating need for negotiation. Fixture device for holding goods in process while working tools are in operation that does not contain any special arrangements for guiding the working tools.

    Fleed Sales

The purchase of vehicles by a business that meet a minimum requirement of units sold.


The largest and most important stamped metal part in a car's body. Usually assembled from several smaller stampings, the floorpan forms the floor and fixes the dimensions for most of the car's external and structural panels. It is also the foundation for many of the car's mechanical parts.

    Fluid Coupling

Any device that transfers power through a fluid between its inputs and outputs. A fluid coupling basically consists of two fans in a sealed, oil-filled housing. The input fan churns the oil, and the churning oil in turn twirls the output fan. Such a coupling allows some speed difference between its input and output shafts.


A heavy disc attached to an engine's crankshaft to increase its rotary inertia, thereby smoothing its power flow.


Prediction of future production or sales in the automotive industry.


A process that transforms solid metal into shapes of varying cross-sectional material thickness, often involving heating.

    Four Valves Per Cylinder (4V)

A valvetrain with a total of four valves in the combustion chamber, typically two intakes and two exhausts. Compared to the more common two-valve-per-cylinder designs, a four-valve layout offers improved breathing and allows the spark plug to be located closer to center of the combustion chamber.

    Four-by-Four (4X4)

Used to describe a vehicle with four-wheel drive. The first figure is the number of wheels, and the second is the number of powered wheels.

    Four-by-Two (4X2)

Used to describe a vehicle with two-wheel drive. The first figure is the number of wheels, and the second is the number of powered wheels. Another term for two-wheel drive.


An internal-combustion engine that requires two revolutions per cylinder or four piston strokes to achieve a power stroke internal stroke, compression stroke, power stroke, exhaust stroke. More efficient than the two-stroke-cycle engine. Also called Otto cycle.

    Four-Wheel Drift

Somewhat imprecise term that describes a cornering situation in which all four tires are operating at large slip angles.

    Four-Wheel Steering

Steering system that actively steers the rear wheels as well as the fronts to improve handling and maneuverability.


A bridge-like, structural base of a car that supports and positions the body and major mechanical items.

    Fuel Injection

On internal-combustion engines, a system that injects a precisely measured amount of fuel into the cylinder at exactly the right moment. Dispenses with the carburetor and increases engine efficiency. Fuel injection provides better metering of fuel and air than carburetors. This results in more power, improved fuel economy, and lower emissions. The simplest systems use single or dual injectors in a central chamber to supply all cylinders. More sophisticated systems use an injector at each cylinder to precisely meter fuel. Any system that meters fuel to an engine by measuring its needs and then regulating the fuel flow, by electronic or mechanical means, through a pump and injectors. Throttle-body injection locates the injector(s) centrally in the throttle-body housing, while port injection allocates at least one injector for each cylinder near its intake port.

    Full-Time Four Wheel Drive

This drive system offers both a two-wheel drive and four-wheel drive mode. Four-wheel drive can be engaged on dry pavement for normal on-road driving because this system uses some type of center differential. A typical full-time four-wheel drive system offers two-wheel drive, four-wheel drive auto and four-wheel drive Low. Virtually all full-time four-wheel drive systems also have a two-speed transfer gearbox.

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