Automotive Technical Terms |
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Throughout this site we use
many technical terms, and given the breadth of readership
our site enjoys, sometimes we are remiss and incorrectly
assume everyone knows what we are referring to. For those
that do not, here are some explanations of the technical
terms use. |
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Energy Absorbing:
Refers to a construction
technique for body panels, chassis or steering columns
that allows them to collapse progressively upon impact.
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Final Drive Ratio:
Gear reduction in
a differential or other last transmission unit in a
drive train. A reduction of 3:1 refers to the input
shaft turning three times faster than the output shaft.
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Horizontally opposed
four cylinder or six cylinder engines, most commonly
found in the Volkswagen Beetle, Porsche and Subaru
iterations.
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Flat Spot:
Refers to an engine’s
performance being poor in one particular part of the
rev range.
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Abbreviated to FWD,
refers to a car in which the front wheels rather than
the rear are driving the wheels.
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Frontal Area:
The front surface of a
vehicle that presents an obstruction to the airflow
past the vehicle at speed. Used in conjunction with
the coefficient of drag to determine the aerodynamic
efficiency of a vehicle.
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Electrical or mechanical
device that delivers fuel from the fuel tank to the
carburetor.
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A system where petrol
is metered in accurately measured quantities directly
into the cylinders, rather than being mixed with air
and drawn into the cylinders by the manifold vacuum
as it is with a conventional carburetor set-up.
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Gear Ratio:
Used to define the number
of times that an input shaft turns in relation to the
output shaft.
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Greenhouse:
The upper portion of the
automobile comprising the windscreen, side windows,
rear window and roof. More applicable to modern cars
with large glass areas.
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Ground Clearance:
Minimum distance between
the lower side of the automobile and the ground.
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Gudgeon Pin:
Also called the “piston
pin” or “wrist
pin”, it connects the piston to the top of the
con-rod by the little end bearing.
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