User Manual
G3412C
GAS ENGINE TECHNICAL DATA
30 35 40 45 50 55 60 65 70 75 80 85-100
--------232527
000000001.00 1.00 1.00
130 1.00 1.00 1.00 0.98 0.94 0.91 0.87 0.84 0.81 0.77 0.74 0.71 0.68
120 1.00 1.00 1.00 1.00 0.96 0.92 0.89 0.85 0.82 0.79 0.76 0.73 0.70
AIR
110 1.00 1.00 1.00 1.00 0.98 0.94 0.90 0.87 0.83 0.80 0.77 0.74 0.71
TO
100 1.00 1.00 1.00 1.00 0.99 0.96 0.92 0.88 0.85 0.82 0.78 0.75 0.72
TURBO
90 1.00 1.00 1.00 1.00 1.00 0.97 0.94 0.90 0.86 0.83 0.80 0.76 0.73
80 1.00 1.00 1.00 1.00 1.00 0.99 0.95 0.92 0.88 0.85 0.81 0.78 0.75
(°F) 70 1.00 1.00 1.00 1.00 1.00 1.00 0.97 0.93 0.90 0.86 0.83 0.79 0.76
60 1.00 1.00 1.00 1.00 1.00 1.00 0.99 0.95 0.91 0.88 0.84 0.81 0.78
50 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.97 0.93 0.90 0.86 0.83 0.79
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000
ALTITUDE (FEET ABOVE SEA LEVEL)
130 1.49 1.57 1.65 1.74 1.83 1.91 1.91 1.91 1.91 1.91 1.91 1.91 1.91
120 1.39 1.47 1.55 1.64 1.72 1.80 1.80 1.80 1.80 1.80 1.80 1.80 1.80
AIR
110 1.29 1.37 1.45 1.53 1.62 1.70 1.70 1.70 1.70 1.70 1.70 1.70 1.70
TO
100 1.19 1.27 1.35 1.43 1.51 1.59 1.59 1.59 1.59 1.59 1.59 1.59 1.59
TURBO
90 1.09 1.17 1.25 1.33 1.41 1.49 1.49 1.49 1.49 1.49 1.49 1.49 1.49
80 1.00 1.07 1.15 1.22 1.30 1.38 1.38 1.38 1.38 1.38 1.38 1.38 1.38
(°F) 70 1.00 1.00 1.04 1.12 1.20 1.27 1.27 1.27 1.27 1.27 1.27 1.27 1.27
60 1.00 1.00 1.00 1.02 1.10 1.17 1.17 1.17 1.17 1.17 1.17 1.17 1.17
50 1.00 1.00 1.00 1.00 1.00 1.06 1.06 1.06 1.06 1.06 1.06 1.06 1.06
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000
ALTITUDE (FEET ABOVE SEA LEVEL)
100% Load Data dB(A) (dB)
3.2
97.7 87.2 91.2 92.2 94.2 93.2 92.2 76.2 69.2
22.9
87.7 80.8 79.8 80.8 81.8 82.8 82.8 75.8 65.8
49.2
81.7 77.3 76.3 79.3 78.3 76.3 75.3 70.3 58.3
4.9
113.0 102.5 112.5 113.2 112.5 105.5 103.2 101.9 92.1
22.9
99.7 93.2 102.8 97.8 97.5 92.2 91.2 91.2 83.3
49.2
93.0 86.6 96.2 91.2 90.9 85.6 84.6 84.6 76.6
Overal SPL 63 Hz 125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 khz
Octave Band Center Fre
q
uenc
y
(
OBCF
)
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.
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.
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.
DM5444-02
27
FUEL USAGE GUIDE
CAT METHANE NUMBER
IGNITION TIMING
PAGE 2 OF 3 03-Mar-09
FREE FIELD MECHANICAL & EXHAUST NOISE
Free Field
Exhaust
Free Field
Mechanical
DISTANCE FROM
THE ENGINE (FEET)
DISTANCE FROM
THE ENGINE (FEET)
DERATION FACTOR
1.00
ALTITUDE DERATION FACTOR
S
AFTERCOOLER HEAT REJECTION FACTORS (ACHRF
)