Single
cylinder 4 – stroke I. C. Engine using Turning moment Diagram.
A turning moment diagram
for a four stroke cycle internal combustion engine, we know that in a four
stroke cycle internal combustion engine, there is one working stroke after a
crank has turned through two revolution i.e.7200 .
Since the pressure inside
the engine cylinder is less than the atmospheric pressure during suction stroke
therefore a negative loop is formed. During the compression stroke, the work is
done on gases, therefore a higher negative loop is obtained.
During the expansion or
working stroke, the fuel burns and the gases expand, therefore a positive loop
is obtained. In this stroke the work done is by the gases. During exhaust
stroke, the work is done on the gases, therefore negative loop is formed. It
may be noted that effect of inertia forces on the piston is taken is account.
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