Ignition
Circuit
An ignition circuit
is made up of two sub-circuits: the primary, which carries low voltage;
and the secondary, which carries high voltage. The primary circuit is
controlled by the ignition key. It releases 12 volts of electricity from
the battery or alternator through the coil to a set of breaker points in
the lower part of the distributor, or to the relay in electronic
ignition applications. When the points or relay are closed, current
flows through the chassis back to the battery, completing the circuit.
When the points or relay are open, the flow stops, causing a
high-voltage surge to pass from the coil through a rotor in the top of
the distributor to the spark plugs. Once the car has started, the
voltage regulator protects the battery from being overcharged by the
alternator. part of the low -voltage current is absorbed by the
condenser when the points are open.
Idler
Gears
These are small gears which are
not directly linked to anything. Idle gears are used to reduce or
increase rotation speeds, and reverse directions of rotation. The center
gear would be considered an idle gear, if three gears are connected in a
string.
Indicator
Needle
This is the pointer on your gauge
that shows you the gauge's current reading. Its examples are those found
in your speedometer, temperature gauge, tachometer and oil pressure
gauge.
Intake
Stroke
The first stroke is called the
intake stroke. The piston moves down the cylinder, creating a partial
vacuum in the cylinder. A mixture of air and fuel is then forced through
the inlet valve into the cylinder by atmospheric pressure, now greater
than the pressure in the cylinder. The exhaust valve stays closed during
the stroke.
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