T8

DIESEL

ENGINE

TITLE

T8: DIESEL ENGINE

THEORY :

The term diesel engine is to be understood in present purposes as any

“reciprocating engine” in the cylinders of which an introduced charge of air is

“compressed” sufficiently to ensure the spontaneous ignition and combustion

charge of air is “compressed” sufficiently to ensure the spontaneous ignition and

combustion of an atomized of fuel oil injected into the charge compressed air.

OBJECTIVE :

To conduct and obtain an engine performance curve/ full load test

APPARATUS :

1. Diesel engine unit.

PROCEDURE :

1. The main supply to instruments and exhaust fan is switched on.

2. Ensure “VARIAC TRANSFORMER” is located at “0”; volt position.

3. Cylinder “A” is filled with diesel oil to the minimum level (16 ml)

4. Water flow valve “E” is opened and water flow is adjusted to 15 litres/hour.

5. Oil filter valve “B” is adjusted to open position.

6. Throttle valve “C” is adjusted to start (Full throttle position)

7. Decompression calve “D” is lifted and maintain “Lift” position.

8. Starter key “E” is turned to start position. Starter motor is allowed to crank

flywheel for maximum 10 seconds only.

9. The decompression lever and starter key together are released together.

10. Upon engine star up, 1 minute warm up is allowed, before adjusting throttle to

middle position.

11. A suitable speed and load is selected, so that the engine will labor upon

reaching maximum load.

12. Load is reduced to no load or minimum and throttle position is maintained.

13. A fresh supply of fuel is introduced to measuring cylinder. Note consumption

rare when load is slowly increased.

14. The voltage and ammeter is monitored.

RESULTS

For load = 30

Speed Engine Oil

Temperature

(oC)

Exhaust

Temperature

(oC)

Water

Temperature

In (oC)

Water

Temperature

Out (oC)

¼ 45 79 29 50

½ 51 86 30 57

Full 54 119 30 91

Speed AC

Ammeter

(A)

AC

Voltmeter

(V)

Tachometer

(rpm)

Fuel Flow

(ml)

Time (s)

¼ 0.02 1 1008 20 244

½ 0.03 2 1234 20 222

Full 0.64 43 1662 20 101

For load = 60

Speed Engine Oil

Temperature

(oC)

Exhaust

Temperature

(oC)

Water

Temperature

In (oC)

Water

Temperature

Out (oC)

¼ 61 88 31 93

½ 63 105 31 91

Full 64 134 31 92

Speed AC

Ammeter

(A)

AC

Voltmeter

(V)

Tachometer

(rpm)

Fuel Flow

(ml)

Time (s)

¼ 2.5 16 1090 20 257

½ 6.7 45 1333 20 161

Full 11.4 78 1706 20 86

For load = 90

Speed Engine Oil

Temperature

(oC)

Exhaust

Temperature

(oC)

Water

Temperature

In (oC)

Water

Temperature

Out (oC)

¼ 68 103 30 88

½ 69 112 29 86

Full 69 153 29 92

Speed AC

Ammeter

(A)

AC

Voltmeter

(V)

Tachometer

(rpm)

Fuel Flow

(ml)

Time (s)

¼ 6.8 46 1159 20 199

½ 15.2 96 1598 20 144

Full 15.4 106 1721 20 73

For load = 120

Speed Engine Oil

Temperature

(oC)

Exhaust

Temperature

(oC)

Water

Temperature

In (oC)

Water

Temperature

Out (oC)

¼ 71 120 29 82

½ 70 137 29 86

Full 70 163 29 94

Speed AC

Ammeter

(A)

AC

Voltmeter

(V)

Tachometer

(rpm)

Fuel Flow

(ml)

Time (s)

¼ 13.6 93 1322 20 188

½ 17.2 118 1479 20 128

Full 17.1 118 1531 20 60