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Multiple-Cylinder Engines | Up
Construction Mechanic Basic Volume 01 - Construction methods and practices | Next
Arrangement of Valves |
During the other three strokes, it is absorbing power to
push out the exhaust gas, to pull in a fresh charge, and to
compress the charge. The flywheel makes the engine
run without varying much of the speed during each
revolution. It is a heavy steel wheel, attached to the end
of the crankshaft. When it is rotating, considerable
effort is required to slow it down or stop it. Although the
wheel does slow down somewhat as it delivers power to
the engine during the exhaust, intake, and compression
strokes, the wheel speed increases during the power
stroke. In effect, the flywheel absorbs some of the
engine power during the power stroke and then provides
it back to the engine during the other three strokes.
In a multi-cylinder engine, the flywheel functions
in a similar manner. It absorbs power when the engine
tends to speed up during the power stroke, and it
provides power to the engine when the engine tends to
slow down during intervals when little power is being
delivered by the engine.
In addition to the engine itself, which is the power
producer, there must be accessory systems to provide
the engine with other requirements necessary to operate
it. These systems are the fuel system, the lubrication
system, the electrical system, the cooling system, and
the exhaust system
ARRANGEMENT OF CYLINDERS
Engines are also classified according to the
arrangement of the cylinders (fig. 2-10): IN-LINE with
all cylinders cast in a straight line above the crankshaft;
V-TYPE with two banks of cylinders mounted in a V-
shape above the crankshaft; HORIZONTAL
OPPOSED with cylinders arranged 180 degrees from
other with opposing cylinders sharing a common
crankshaft journal; and RADIAL with the cylinders
placed in a circle around the crankshaft
IN-LINE—In-line is a common arrangement
for both automotive and truck applications. It is
commonly built in four- and six-cylinder
configurations.
V-TYPE—V-type is also a common
arrangement for both automotive and truck
applications. The V-type engine in a six-cylinder
configuration is suitable for front-wheel drive
cars where the engine is mounted transversely.
Figure 2-10.—Typical cylinder arrangements
2-10
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