Quantcast Table 3-7. Dynamometer Test Chart

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TM 9-2815-226-34-2
(4)
At each phase:
Table 3-7. Dynamometer Test Chart
Rated
Air
Rating
Crankcase
Phase 1
Phase 2
Phase 3
Phase 4
Power Check
HP@RPM Fuel
Manifold
@
Pressure
To Temp
15 Min.
15 Min.
15 Min.
5 Min.
Ft/Lb
Ft/Lb
HP@
500
Rate
Pressure
Altitude
With
HP@
HP@
HP@
HP@
HP@
Sea
500 Ft
Engine RPM
Ft-Alt
LB/HR
IN/HG
Maximum
Turbo
RPM
RPM
RPM
RPM
RPM
Level
Alt.
FT.
IN/H2 O
NTC-
400@ 400@
158
41/49
12,000
12
200@
300@
340@
360@
380@
1000
1000
400
2100  2100
1575
2100
2100
2100
2100
BC2
NOTE
NTC400BC2 engine does not require fuel deaerating below altitude shown in column entitled
"Rating Altitude Maximum." Above maximum altitude, deaerate at each 1,000 ft (304.8 m)
additional altitude by 4 percent. Crankcase pressure is given in inches of water. Percent of HP
@ RPM ratings for break-in phases are established as follows
Phase 1 - 50%
HP @ 75% RPM
Phase 2 - 75%
HP @ 100% RPM
Phase 3 - 85%
HP @ 100l RPM
Phase 4 - 90%
HP @ 100% RPM
Power Check -
96% HP @ 100% RPM
TA295595
(a)
Apply dynamometer load to +10% horsepower at +5% speed as shown.
NOTE
Crankcase pressure (blow-by) manometer readings not exceeding 0.30 in.
HO
2
(7.62 mm H2O) surge are normal.
(b)
Make frequent checks of crankcase pressure (blow-by) at any given stabilized speed. If pressure surge
exceeds 0.30 in H O (7.62 mm H2 O), reduce speed for 30 to 45 minutes, and then accelerate back to
2
original setting.
(c)
If blow-by continues to drop at any given speed, cut run-in time in half; otherwise, run engine for specified
time period.
3-468


 


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