**3.3 Diesel engine torque and horse power measurements**

A small engine dynamometer (See Figure 8) was used to test the performance (torque and horse power) of the Diesel engine. The dynamometer is a water brake load system. The pump pressurizes the water which then goes into the water brake connected to the engine shaft. Part of the energy produced by the engine goes to the exhaust while the rest of it is released as calorific calories to the water that passes thru the water brake. For this reason the water has to be cooled down, as it will over heat over time and loose efficiency. The dynamometer is equipped with sensors, data acquisition system and software to measure the Torque and engine RPM (rotation per minutes). The measured values of the torque and RPM are used to determine the horsepower:

$$\text{Horssequence} = \text{(RPM\* Torque)} / \text{ 5252} \tag{3}$$

Fig. 8. Engine Dynamomter
