1. LAB REPORT
INTERNAL COMBUSTION ENGINE
GROUP MEMBERS:
 AMEER NAWAZ (08-HITEC-ME-16)
 ALI RAZA (08-HITEC-ME-14)
 ARSLAN FAZIL (08-HITEC-ME-19)
SECTION: “C”
EXP : “03”
DATED : October 2011
SUBJECT:
MEASUREMENT OF TORQUE,SPEED,AND POWER.
SUBMITED TO:
SIR KAMRAN KAYANI.

2. APPARATUS:
 Diesel engine analyzer (4-stroke).
 Solenoid valve.
 Pressure sensor.
 Temperature sensor.
 Fuel tank.
 Coolant (water).
THEORY:
In Diesel engine when the air is compressed, the fuel is sprayed after the compression stroke due to which
the fuel ignites and hence the power stroke occurs. The speed of engine is at how many revolutions per
minute the engine is rotating crank. In engine torque is measured by use of dynamometer. The
dynamometer is used to measure breaking torque by the increasing water level inside the dynamometer in
case of hydraulic dynamometer. There are other dynamometers as well in which the torque is measured
by touch engine output (rotor) with a stator of dynamometer. Once the speed and torque of engine is
measured it is used to calculate power. Power is the rate of energy transfer to or from the system. One can
think of power as rate of doing work. Speed of engine is a rotational frequency. Indicated power is the
theoretical power which is set by designer by maximum calculated power. This power is usually
calculated from PV diagram. However the brake power is measured at the output including all losses.
There is a relation between power and torque
𝑃=2𝜋𝑁𝑇
PROCEDURE:


 First of all turn non engine analyzer.
 Then the fuel flow meter was turned on and air tank intake was properly checked.
 Then with coil starter start engine analyzer.
 Note the reading from analyzing softwarein computer. At different speeds wemeasured
torques. So speed and torque collectively gaveus power.
TABLE:
SPEED (rpm) TORQUE (Nm) POWER (watt)
1137 3.2 381.0
1881 5.4 1063
2719 6.7 1907
3193 6.4 2140
3664 5.7 2187

3. GRAPH # 01 (TORQUE vs SPEED)
GRAPH # 02 ( POWER vs SPEED
Discussions Conclusions:
In this introductory practical of internal combustion engine lab it is observed that what the diesel engine
analyzer is and how it works. And also the main parts of the engine analyzer 4-stroke diesel engine. And
how to run a diesel engine analyzer and got reading procedure. And measurement of torque, power and
speed and their relations and by plotting them on graph and checks the curves behavior between them.
Finally it is concluded that the practical is performed successfully.