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CAT METHANE NUMBER

<30

30

35

40

45

50

55

60

65

70

75

80-100

IGNITION TIMING

-

14

15

16

17

14

15

16

16

18

20

23

DERATION FACTOR

0

0.59

0.59

0.59

0.59

9.00

9.00

9.00

1.00

1.00

1.00

1.00

G3516

GAS ENGINE TECHNICAL DATA

FUEL USAGE GUIDE

130

1.00

1.00

1.00

0.98

0.95

0.91

0.88

0.84

0.81

120

1.00

1.00

1.00

1.00

0.96

0.93

0.89

0.86

0.82

110

1.00

1.00

1.00

1.00

0.98

0.94

0.91

0.87

0.84

100

1.00

1.00

1.00

1.00

1.00

0.96

0.92

0.89

0.85

90

1.00

1.00

1.00

1.00

1.00

0.98

0.94

0.90

0.87

80

1.00

1.00

1.00

1.00

1.00

0.99

0.96

0.92

0.88

70

1.00

1.00

1.00

1.00

1.00

1.00

0.97

0.94

0.90

60

1.00

1.00

1.00

1.00

1.00

1.00

0.99

0.95

0.92

50

1.00

1.00

1.00

1.00

1.00

1.00

1.00

0.97

0.94

0

1000

2000

3000

4000

5000

6000

7000

8000

AIR TO TURBO

ALTITUDE

DERATION FACTORS

(°F)

ALTITUDE (F

EET ABOVE SEA LEVEL)

130

1.48

1.56

1.64

1.73

1.82

1.91

1.91

1.91

1.91

120

1.38

1.46

1.54

1.63

1.71

1.80

1.80

1.80

1.80

110

1.28

1.36

1.44

1.53

1.61

1.70

1.70

1.70

1.70

100

1.19

1.26

1.34

1.43

1.51

1.59

1.59

1.59

1.59

90

1.09

1.17

1.24

1.32

1.41

1.49

1.49

1.49

1.49

80

1.00

1.07

1.14

1.22

1.30

1.38

1.38

1.38

1.38

70

1.00

1.00

1.04

1.12

1.20

1.28

1.28

1.28

1.28

60

1.00

1.00

1.00

1.02

1.10

1.18

1.18

1.18

1.18

50

1.00

1.00

1.00

1.00

1.00

1.07

1.07

1.07

1.07

AFTERCOO

AIR TO TURBO

(°F)

LER HEAT

REJECTION

FACTORS (ACHRF)

0

1000

2000

3000

6000 7000 8000 (FEET ABOVE SEA LEVEL)

4000

5000 ALTITUDE

1.91

1.91

1.91

1.91

1.80

1.80

1.80

1.80

1.70

1.70

1.70

1.70

1.59

1.59

1.59

1.59

1.49

1.49

1.49

1.49

1.38

1.38

1.38

1.38

1.28

1.28

1.28

1.28

1.18

1.18

1.18

1.18

1.07

1.07

1.07

1.07

9000

10000

11000

12000

0.78

0.75

0.72

0.69

0.79

0.76

0.73

0.70

0.80

0.77

0.74

0.71

0.82

0.79

0.75

0.72

0.83

0.80

0.77

0.74

0.85

0.81

0.78

0.75

0.86

0.83

0.80

0.76

0.88

0.85

0.81

0.78

0.90

0.86

0.83

0.79

9000

10000

11000

12000

95.5

92.1

86.3

87.3

90.0

91.6

88.4

80.0

85.9

82.5

76.7

77.7

80.4

82.0

78.8

70.4

80.6

77.2

71.4

72.4

75.1

76.7

73.5

65.0

99.8

103.6

105.7

102.2

103.0

105.1

106.9

100.3

89.5

91.8

93.2

89.6

92.0

91.8

92.2

85.2

82.9

85.2

86.6

83.0

85.4

85.2

85.6

78.5

FREE FIELD MECHANICAL & EXHAUST NOISE

ALTITUDE DERATION FACTORS: This table shows the deration required for various air inlet temperatures and altitudes. Use this information along with the fuel usage guide chart to help determine actual engine power for your site.

FUEL USAGE GUIDE: This table shows the derate factor required for a given fuel. Note that deration occurs as the methane number decreases. Methane number is a scale to measure detonation characteristics of various fuels. The methane number of a fuel is determined by using the Caterpillar Methane Number Calculation program.

dB(A)

3.2

96.3

22.9

86.7

49.2

81.3

4.9

111.6

22.9

98.3

49.2

91.6

Overal SPL

100% Load Data

(dB)

Free Field

DISTANCE FROM

Mechanical

THE ENGINE (FEET)

8 khz

Free Field

DISTANCE FROM

Exhaust

THE ENGINE (FEET)

4 kHz

63 Hz 125 Hz Octave Ban

250 Hz 500 Hz 1 kHz

2 kHz

d Center Frequency (OBCF)

ACTUAL ENGINE RATING: It is important to note that the Altitude/Temperature deration and the Fuel Usage Guide deration are not cumulative. They are not to be added together. The same is true for the Low Energy Fuel deration (reference the Caterpillar Methane Number Program) and the Fuel Usage Guide deration. However, the

Altitude/Temperature deration and Low Energy Fuel deration are cumulative; and they must be added together in the method shown below. To determine the actual power available, take the lowest rating between 1) and 2).

  • 1)

    (Altitude/Temperature Deration) + (Low Energy Fuel Deration)

  • 2)

    Fuel Usage Guide Deration

Note: For NA's always add the Low Energy Fuel deration to the Altitude/Temperature deration. For TA engines only add the Low Energy Fuel deration to the Altitude/Temperature deration whenever the Altitude/Temperature deration is less than 1.0 (100%). This will give the actual rating for the engine at the conditions specified.

AFTERCOOLER HEAT REJECTION FACTORS (ACHRF): Aftercooler heat rejection is given for standard conditions of 77°F and 500 ft altitude. To maintain a constant air inlet manifold temperature, as the air to turbo

temperature goes up, so must the heat rejection. As altitude increases, the turbocharger must work harder to overcome the lower atmospheric pressure. This

increases the amount of heat that must be removed from the inlet air by the aftercooler. Use the aftercooler heat rejection factor (ACHRF) to adjust for ambient and altitude conditions. Multiply this factor by the standard aftercooler heat rejection. Failure to properly account for these factors could result in detonation and

cause the engine to shutdown or fail.

SOUND DATA: Data determined by methods similar to ISO Standard DIS-8528-10. Accuracy Grade 3. SPL = Sound Pressure Level.

DM5144-01

PAGE 2 OF 3

14-Oct-08

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