Technical Terms Used In Engine

!_l6l8l; TDC=6k 8]8\ ;]G6/(Top Dead Center)

   lk:6f]g(Piston) dfyL cfO{k'Ug] l;lnG8/(Cylinder)sf] efunfO{ l6l8l; (Top Dead Center Or TDC) elgG5 .

@_lal8l; BDC=a6d 8]8\ ;]G6/ - Botom Dead Center)

   lk:6g(Piston) ;a}eGbf tn k'Ug] l;lnG8/(Cylinder)sf] efunfO{ lal8l; (Botom Dead Center) elgG5 .

#_:6žf]s (Stroke)  

   l6l8l; (Top Dead Center) / lal8l; (Botom Dead Center) larsf] b'l/nfO{ :6žf]s(Stroke)  elgG5 .

$_af]/

   l;lnG8/(Cylinder)sf] Aof;nfO{ af]/ (Bore)  elgG5 .

%_sdAo";g RofDa/ (Combustion Chamber)

   lk:6f]g(Piston) 4f/f sDk|];(Compress) ul/Psf] xfjf / O{Gwgsf] ld>0f aNg] 7fp`nfO{ sdAo";g RofDa/(Combustion Chamber) elgG5 .

^_lSnc/]G; ef]lnod (Clearance Volume) 

   lk:6f]g(Piston) l;lnG8/(Cylinder)sf] dfly l6l8l; (Top Dead Center)df x'bf` af`sL /x]sf] 7f`psf] cfotgnfO{ lSnc/]G; ef]lnod(Clearance Volume)  elgG5 .

&_lk:6f]g l8;Kn];d]G6 (Piston Displacement)

   lk:6f]g(Piston) lal8l; (Botom Dead Center Or BDC)df x'bf` l;lnG8/(Cylinder)sf] ef]lnod(Volume)nfO{ lk:6f]g l8;Kn];d]G6(Piston Displacement) elgG5 . o;nfO{ So"ljs ;]lG6dL6/(Cubik Centimeter Or CC) O{sfO{df dfkg ul/G5 . Bore=D   Stroke=S eP Piston Displacecment      

Engine Displacement Calculation

One of the most important things to remember when calculating piston displacement is that, you are measuring VOLUME.

To calculate your engines displacement use this formula:

Piston Displacement     =   π  x  (radius)²  x  stroke  x  number of cylinders

                π = 3.14

                radius = bore/2

                stroke = the distance from TDC to BDC

                number of cylinders = the number of cylinders in the engine

 Here is an Example:

This engine has:    Bore= 80mm                             

                            Stroke = 90mm

                            Number of Cylinders = 1

            Radius = Bore/2

                        = 80 ÷ 2

                        = 40mm

 Piston Displacement = π  x  (radius)²  x  stroke  x  number of cylinders

                                 =    3.14   x   (40)²  x  90   x    1

                                 =    3.14   x    1600mm   x   90    x   1

                                 =    452 160 mm³

You will notice that you answer is in mm³ .  Engines are usually give a size of displacement in cm³  or commonly referred to as CC's.  To convert your answer to CC's, divide your answer by 1000.  In this example, you would have 452 160mm³ ÷ 1000 giving you an answer of 452.16 cm³  or 452.16 cc.  This engine has a displacement of 452.16 cm³  or 452.16 cc.

 Often larger engines have their displacements measured in litres.  To get this measurement, divide you answer that is in cm³ or cc's by 1000.  In this example, you would have 452.16cm³ ÷ 1000 giving you an answer of 0.452 Litre or 0.452 L.  This engine has a displacement of 0.452 Litres or 0.452 L.

 Here is One More Example:

This engine has:    Bore= 87.5 mm                             

                            Stroke = 91.4 mm

                            Number of Cylinders = 2

            Radius = Bore/2

                        = 87.5 ÷ 2

                        = 43.75 mm

 Piston Displacement = π  x  (radius)²  x  stroke  x  number of cylinders

                                 =    3.14   x   (43.75)²  x  91.4   x    2

                                 =    3.14   x    1914mm   x   91.4    x   2

                                 =    1 098 656.5 mm³    or  

                                 =    1099 cm³    or

                                 =    1.100 litres (L)   

                        This engine is a 1.100 litre two cylinder engine.

*_sDk|];g /fl6of] (Compression Ratio)

   l;lnG8/(Cylinder) leq lk:6f]g(Piston) 4f/f xfjf / O{Gwgsf] ld>0fnfO{ bjfa lbg] cg'kftnfO{ sDk|];g /fl6of] (Compression Ratio) elgG5 .

                    _____ Clearance Volume_______

                    Comprssion Ration=Clearance Volume + Piston Displacement