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B a s i c t e r m i n o l o g y - E n g i n e
A.
..
. Dead center
Either of the two limits in the cylinder at which the
piston changes its moving direction.
TDC ------- top dead center(the upper limit of the piston
movement)
BDC------- bottom dead center(the lower limit of the
piston movement)
B. Bore
Bore is the internal diameter of the cylinder block
C. Stroke
The length of the piston travel is called the stroke.
When piston moves from TDC to BDC, it is one stroke.
D.
D. D.
D. Displacement
The volume swept by piston when traveling from TDC to BDC is
called displacement. Normally displacement is measured in
CC( cubic centi-meter) e.g. 75cc, 125cc etc. and it varies
according to engine type.
E. Torque
Torque is a kind of twisting or turning force. When we loosen
or tighten the screws or bolts, we impart the torque to them.
The engine imparts torque to the wheels to drive them, and
imparts more torque when it climbs. The produce of strength and
the arm of force equal to the torque, and its unit is kilogram-meter.
F. The timing of ignition.
The ignition is timed in order to control the combustion
in the firebox. The timing ignition of ATV250 engine
changes as follows: 15
0
。
When it is 5000RPM.
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