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Gap
The distance the spark must travel in jumping from the centre
electrode to the side electrode in a spark plug. Also refers to the
spacing between the points in a contact breaker assembly in a
conventional points-type ignition, or to the distance between the
reluctor or rotor and the pickup coil in an electronic ignition.
Gasket
Any thin, soft material - usually cork, cardboard, asbestos or soft
metal - installed between two metal surfaces to ensure a good seal.
For instance, the cylinder head gasket seals the joint between the
block and the cylinder head.
Gas Turbine
An
internal-combustion rotating engine with one main moving part: the
rotor with pinwheel-like blades attached. Air is compressed by the
first rows of blades and delivered to the combustion chambers, from
which the exhaust is directed to pass the remaining blades and to
generate the power. Power is extremely smooth due to the absence of
explosions and reciprocating parts.
Gauge
An instrument panel display used to monitor engine conditions. A
gauge with a movable pointer on a dial or a fixed scale is an
analogue gauge. A gauge with a numerical readout is called a digital gauge.
Gear
Oil A thick lubricant, generally with an SAE number of 80 or
above, used in standard transmissions or differentials. These often
contain additives, such as an EP additive, to guard against being
squeezed out from between gear teeth.
Gear
Shift
1.
A floor- or steering-wheel-mounted lever used to manually change
gears in the transmission.
2.
A linkage-type mechanism by which the gears in a transmission are engaged.
Gears
Wheels
with meshing teeth to transmit power between rotating shafts. When
the gear wheels are of different sizes, a change in speed ratio
occurs. Gears are made of hard steel.
Glasspack
Muffler An absorption muffler that uses fiberglass as a
sound-deadening material.
GPH
Abbreviation for gallons per hour. A measurement commonly used to
indicate the flow rate of a fuel pump. See also LPH.
Engines that have been modified to produce more horsepower may
require a higher-flow fuel pump, as well as an adjustable fuel
pressure regulator.
Governor
[1]
A device designed to automatically control the speed or position of
some part (i.e., engine speed or transmission speed). Governors are
used to prevent an engine from exceeding its maximum rpms. They are
also used on rental vehicles to prevent operators from speeding.
[2]
A governor on the output shaft of a hydraulically controlled
transmission converts line pressure into governor pressure. In
electro-hydraulically controlled transmissions, the governor is
replaced by a sensor.
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