Posted in the Auto Parts Forum
Since: Jan 13
#1 Jan 15, 2013
Linking the piston by a connecting rod to a crankshaft causes the gas to rotate the shaft through half a turn. The power stroke “uses up” the gas , so means must be provided to expel the burnt gas and recharge the cylinder with a fresh petrol-air mixture :this control of gas movement is the duty of the valves ;an inlet valve allows the new mixture to enter at the right time and an exhaust valve lets out the burnt gas after the gas has done its job. Engine terms are :
TDC(Top Dead Center):the position of the crank and piston when the piston is farther away from the crankshaft.
BDC(Bottom Dead Center):the position of the crank and piston when the piston is nearest to the crankshaft.
Stroke : the distance between BDC and TDC; stroke is controlled by the crankshaft.
Bore : the internal diameter of the cylinder.
Swept volume : the volume between TDC and BDC.
Engine capacity : this is the swept volume of all the cylinder e.g. a four-stroke having a capacity of two liters(2000cm) has a cylinder swept volume of 50cm.
Clearance volume: the volume of the space above the piston when it is at TDC.
Compression ratio =(swept vol + clearance vol)\(clearance vol)
Two-stroke : a power stroke every revolution of the crank.
Four-stroke : a power stroke every other revolution of the crank..
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