Basic Engine Terminology:
Top Dead Centre (TDC):
Refers to the position of the crank shaft when the piston is in its top most position
Bottom Dead Centre (BDC):
Refers to the position of the crankshaft when the piston is in its lowest position
Bore:
Diameter of the engine cylinder
Stroke:
Distance travelled by the piston in moving from TDC to BDC
Clearance Volume:
Volume of cylinder (including combustion chamber) above the piston when it is in the TDC position
Piston Displacement:
Volume swept by the piston in moving from TDC to BDC. It’s also called as swept volume
Engine capacity:
Total piston displacement of all the engine cylinders
Compression ratio:
Ratio of the volume above the piston at BDC to the volume above the piston at TDC. About 9 – 11 in Petrol Engines and 15 – 24 in Diesel Engines
Mean Effective Pressure:
Average effective pressure throughout the whole power stroke
Power:
Work done in a given period of time
Indicated Power (IP):
Power developed within the engine cylinders; calculated from area of the engine indicator diagram. Unit – Kilowatts (KW)
Brake Power (BP):
Actual power delivered at the crankshaft; obtained by deducting various power losses in the engine from the IP; measure with a Dynamometer. This is what keeps the vehicle running at any speed once you have accelerated.
Engine Torque:
Force of rotation acting the crankshaft axis at any given instant of time. It provides the vehicle acceleration and is directly proportional to engine power.
Tags: Basic Engine Terminology; IC Engine Terminology, Car Engine Terminology; Basic Definition used in Engine Terminology; Indicated Power; Brake Power; Compression ratio; Swept Volume; Engine Capacity; Stroke; Bore
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