TM-9-2815-200-35
ENGINE, WITH CONTAINER:TURBOSUPERCHARGED, DIESEL ,FUEL INJECTION ,90-DEGREE “V” TYPE, AIR - COOLED ,12 - CYLINDER , ASSEMBLY ;MODELS AVDS-1790-2M (2815-856-4996), AVDS-1790-2A AND AVDS-1790-2AM (2815-856-9005)
TECHNICAL MANUAL; DIRECT SUPPORT, GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS
TM-9-2815-200-35 - Page 553 of 779
Table 8-4. Fuel Temperature Correction
Temp. °F
60
61
62
63
64
65
66
67
6 8
69
70
71
72
73
74
75
76
77
78
79
Corr
.000
+.001
+.00 2
+.00 3
+ .004
+ .005
+ .006
+.00 7
+ .008
+.00 9
+.01 0
+.011
+.01 2
+.01 3
+.01 4
+.01 5
+.01 6
+.017
+.01 8
+.01 9
Fuel Flow
No. / Hr. Max.
313.0
312.7
312.4
312.1
311.8
311.5
311.2
310.9
310.6
310.3
310.0
309.7
309.4
309.1
308.8
308.5
308.2
307.9
307.6
307.3
Table 8-5. Fan Horsepower to be Used for Correcting
Engine Gross Horsepower
Engine Speed
(rpm)
2520
2400
2200
2000
1800
1600
1400
1200
1000
900
125.0
108.0
83.5
62.5
45.6
32.0
21.5
13.5
7.2
5.7
FORMULAE - AVDS-1790-2 A
= 3.141 6
N
= RPM of Dynamometer shaf t
T
= Torque in lb. ft = LW Z
L
= Length of torque arm in fee t
W
= Weight of scale reading (lbs )
(Beam reading )
Z
= Scale reading factor (ratio to
actual weight, in units )
If length of torque arm is 21.00 inches or 1.75
feet, and scale reading factor is 3, then
OBHP = W
N
100 0
Fuel Flow
Temp.
°F
Corr
No. / Hr. Max.
—
8 0
+.02 0
307.0
81
+.02 1
306.7
82
+.02 2
306.4
83
+ .023
306.1
8 4
+.02 4
305.8
85
+ .025
305.5
8 6
+.02 5
305,2
87
+.02 7
304.9
88
+.02 8
304.6
89
+.02 9
304.3
90
+.03 0
304.0
91
+.03 1
303.7
92
+.03 2
303.4
93
+.03 3
303.1
9 4
+.03 4
302.8
95
+.03 5
302.5
9 6
+.03 6
302.2
97
+.03 7
301.9
98
+.03 8
301,6
9 9
+ .039
301.3
2. Corrected net BHP -Observed BHP x) 1
+ air temp. correction + Induction air pressure
correction + fuel temperature correction )
3. Gross horsepowe r = corrected net BHP +
fan horsepower .
4. Correction factor reference s
a. Induction air temperature correctio n
factor - Table 8-2
b. Induction air pressure correctio n
factor - Table 8-3
c. Fuel temperature correction facto r
and maximum fuel flow - Table 8- 4
5. Specific fuel consumption =
Fuel flow lb/ hr .
Corrected gross BH P
6. Specifi c
oil consumption =
Oil Consumption lb/ hr .
Corrected gross BH P
7. Fuel Air Ratio = Fuel lb/ hr .
Air lb/ hr .
SAMPLE CALCULATIONS :
Example:
rp m
= 240 0
torqu e
= 133 9
bea m
= 25 5
wet baromete r
= 29.6 4
1. Dry barometer = 29.3 5
2. Average entrance pressure in inches o f
water = 0
8-11
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