The inner diameter of the engine cylinder.
bore
Topmost position of piston inside the cylinder of an engine.
top dead center
Bottommost position of piston inside the cylinder.
bottom dead center
The distance through which the piston moves from TDC to BDC or BDCto TDC
stroke(L)
Space of volume between the top dead centre and cylinder head.
clearance volume
The volume that piston displaces or sweeps as it moves from TDC to BDC or vice versa
swept volume/ volume displacement(Vd)
It is equal to sweep volume of each cylinder times the number of cylinders. It is also known as cubic capacity an engine.
Cylinder Capacity(Ve)
It is the ratio of maximum cylinder volume( when piston is at BDC) to minimum cylinder volume (when piston is at TDC) i.e ratio of swept volume and clearance volume.
compression ratio(rk)
It is of use as appropriate parameters than crankshaft rotation speed for god leading engine behaviour as function of speed..
Mean Piston Speed
