Service manual

02-3
Fuel
Air
Power
CUBIC CAPACITY / DISPLACEMENT :
It is a volume generated by piston when it travels from TDC to BDC. It is measured as Cubic
Centimeter (CC). It can be mathematically arrived at with the radious of the piston and the
stroke of the engine. (pr²× l, when ‘r’ is the radius of the piston and ‘l’ is the length of the
stroke, & p is a constant equal to 3.14). It is also
known as Swept Volume or Displacement volume
of the engine.
CLEARANCE VOLUME :
It is the nominal volume or the space available
above the piston when the piston is at the topmost
position (TDC).
ENGINE :
The Engine converts Chemical energy
availbale in petrol into heat energy then
to mechanical energy for motion. It is the
powerplant of the vehicle where the
power is generated for moving the
vehicle.
BORE :
Bore is the inside diameter of the
cyclinder block in which Piston moves up
and down.
TDC :
TDC stands for Top Dead Center. It is
the top most position to which the piston
can travel in the cylinder barrel.
BDC :
BDC stands for Bottom Dead Center. It is
the bottom most position to which the
piston can travel in the cylinder barrel.
STROKE :
It is a distance travelled by piston from
TDC to BDC or Vice Versa.
Basic Terminology of IC Engines