BASIC ENGINE TERMINOLOGY  

1. TDC 

       This refers to the position of the crankshaft when the piston is in its topmost position. ie, the position closest to the cylinder head


2. BDC
        This refers to the position of the crankshaft when the piston is in its lowest position ie, the position farthest  to the cylinder head
3. BORE 
     Diameter of the engine Cylinder

4. STROKE
    Distance travelled by the piston From TDC to BDC 
5. Clearance Volume 
        The volume of cylinder (including the combustion chamber) above the piston when it is in the TDC position is reffered to as the  Clearance Volume 
6. Piston  Displacememt 
     This is the volume by the piston in moving from TDC to BDC. This is also called swept volume. If 'd' is the cylinder bore and 's' the stroke, the piston displacement, Vs is given by 
                                                            Vs = 3.14*d*d*s
7. Engine Capacity 
      This is the total swept volume of all cylinder. 'n' is the total no of cylinder , Vs is the piston displacement . Then engine CC 
                                                     Vd =  Vs*n 
8. Compression Ratio 
9. Mean Effective Pressure 
10. Power
11. Indicated power 
12. Brake Power 
13.Engine Torque