Service manual

02-4
TOTAL VOLUME :
It is the sum of the swept voume (Displacement volume) and Clearance volume.
Total Volume = Swept volume + Clerance volume.
COMPRESSION RATIO :
It is a ratio between total volume in the engine to the clearance volume available at the end
of compression stroke.
Compression ratio = Total volume of air fuel mixture
Clearance volume
VOLUMETRIC EFFICIENCY :VOLUMETRIC EFFICIENCY :
VOLUMETRIC EFFICIENCY :VOLUMETRIC EFFICIENCY :
VOLUMETRIC EFFICIENCY :
Volumetric efficiency is the ratio between the volume of air fuel mixture that actually
enters the cylinder and Swept volume.
Volumetric Efficiency
= Volume of air fuel mixture inhaled during suction stroke
Swept volume
HORSE POWER (HP OR PS) :
HP : Horse Power
PS : PFERDESTARKE is German unit of power. Horse Power is the ability of the engine
to do a certain amount of work in a given time.
One Horse power is the power required for lifting a weight of 75 Kg. through vertical
distance of one meter in one second.
Conversion :
1PS = 0.986 HP = 0.735 KW
1 HP = 1.014 PS = 0.744 KW
1KW = 1.360 PS = 1.340 HP
Basic Terminology of IC Engines