Basic Engine Model: Curve Number:

Cummins Inc. QSK50-G4 NR2 FR-6726 G-DRIVE

Columbus, Indiana 47202-3005

QSK
Engine Critical Parts List: Date:
1
Engine Data Sheet CPL: 42771 24Jul09

Displacement : 50.3 litre (3067 in3 ) Bore : 159 mm (6.25 in.) Stroke : 159 mm (6.25 in.)
No. of Cylinders : 16 Aspiration : Turbocharged and Low Temperature Aftercooled (2 Pump/2 Loop)

Engine Speed Standby Power Prime Power Continuous Power

rpm kWm hp kWm hp kWm hp

1500 1477 1980 1328 1780 1100 1475

1800 1656 2220 1470 1971 1223 1640

Engine Performance Data @ 1500 rpm litre/hour

OUTPUT POWER FUEL CONSUMPTION
400.0
kg/ lb/ litre/ US gal/
% kWm hp 1500 rpm
kWm·h hp·h hour hour
300.0
STANDBY POWER
100 1477 1980 0.215 0.353 373 98.4
PRIME POWER 200.0

100 1328 1780 0.216 0.356 338 89.2

75 996 1335 0.220 0.362 258 68.1 100.0
50 664 890 0.235 0.386 183 48.4
25 332 445 0.257 0.422 100 26.4 0.0
CONTINUOUS POWER 0 250 500 750 1000 1250 1500
100 1100 1475 0.217 0.357 281 74.1 Gross Engine Output - kWm

Engine Performance Data @ 1800 rpm

US gallons/hour
OUTPUT POWER FUEL CONSUMPTION
120.0
kg/ lb/ litre/ US gal/
% kWm hp 1800 rpm
kWm·h hp·h hour hour 100.0
STANDBY POWER 80.0
100 1656 2220 0.213 0.351 415 109.6
PRIME POWER 60.0

100 1470 1971 0.211 0.347 365 96.4 40.0

75 1103 1479 0.224 0.369 291 76.8
20.0
50 735 986 0.245 0.403 212 56.0
25 368 493 0.275 0.452 119 31.4 0.0
CONTINUOUS POWER 0 500 1000 1500 2000 2500
Gross Engine Output - hp
100 1223 1640 0.218 0.358 313 82.7

CONVERSIONS:(litres = US Gal x 3.785) (US Gal = litres x 0.2642) Data Subject to Change Without Notice
These guidelines have been formulated to ensure proper application of generator drive engines in A.C. generator set in-
Reference AEB 10.47 for determining Electrical Output.
stallations. STANDBY POWER RATING: Applicable for supplying emergency power for the duration of the utility power
outage. No overload capability is available for this rating. Under no condition is an engine allowed to operate in parallel
Data shown above represent gross engine performance capabilities obtained and corrected in accordance with ISO-
with the public utility at the Standby Power rating. This rating should be applied where reliable utility power is available. A
3046 conditions of 100 kPa (29.53 in Hg) barometric pressure [110 m (361 ft) altitude], 25 °C (77 °F) air inlet temper-
Standby rated engine should be sized for a maximum of an 80% average load factor and 200 hours of operation per year.
ature, and relative humidity of 30% with No. 2 diesel or a fuel corresponding to ASTM D2.
This includes less than 25 hours per year at the Standby Power rating. Standby ratings should never be applied except in
Derates shown are based on 15 in H2O air intake restriction and 2 in Hg exhaust back pressure.
true emergency power outages. Negotiated power outages contracted with a utility company are not considered an emer-
gency. PRIME POWER RATING: Applicable for supplying electric power in lieu of commercially purchased power. Prime
Power applications must be in the form of one of the following two categories:UNLIMITED TIME RUNNING PRIME POW- The fuel consumption data is based on No. 2 diesel fuel weight at 0.85 kg/litre (7.1 lbs/US gal). Power output curves are
ER: Prime Power is available for an unlimited number of hours per year in a variable load application. Variable load should based on the engine operating with fuel system, water pump and lubricating oil pump; not included are battery charging
not exceed a 70% average of the Prime Power rating during any operating period of 250 hours. The total operating time alternator, fan, optional equipment and driven components.
at 100% Prime Power shall not exceed 500 hours per year. A 10% overload capability is available for a period of 1 hour
within a 12-hour period of operation. Total operating time at the 10% overload power shall not exceed 25 hours per year. Data Status: --Limited Production--
LIMITED TIME RUNNING PRIME POWER: Limited Time Prime Power is available for a limited number of hours in a non-
variable load application. It is intended for use in situations where power outages are contracted, such as in utility power Data Tolerance: ± 5%
curtailment. Engines may be operated in parallel to the public utility up to 750 hours per year at power levels never to ex-
ceed the Prime Power rating. The customer should be aware, however, that the life of any engine will be reduced by this Chief Engineer:
constant high load operation. Any operation exceeding 750 hours per year at the Prime Power rating should use the Con-
tinuous Power rating.CONTINUOUS POWER RATING: Applicable for supplying utility power at a constant 100% load for
an unlimited number of hours per year. No overload capability is available for this rating.
 G-DRIVE
QSK50-G4 NR2 QSK
2

1500 rpm Derate Curves 1800 rpm Derate Curves

Standby / Prim e P ower Standby / Prime Power

35.0 35.0

30.0
Ambient Temp. ºC/ºF
30.0

Derate (% of Rated Power)

Derate (% of Rated Power)

55/131
25.0 25.0
50/122 55/131

20.0 20.0
50/122 40/104
40/104
15.0 15.0

10.0 10.0
25/77
25/77
5.0 5.0

Ambient Temp. ºC/ºF 0.0

0.0
0 500 1000 1500 2000 2500 3000 3500 0 2000 4000 6000 8000 10000
Altitude (meters) Altitude (feet)

Continuous Power Continuous Power

35.0
35.0
55/131
30.0 Ambient Temp. ºC/ºF
30.0
Derate (% of Rated Power)
Derate (% of Rated Power)

25.0 55/131
25.0
40/104
20.0 20.0
50/122 50/122 40/104
15.0 15.0
25/77
25/77
10.0 10.0

5.0 5.0

Ambient Temp. ºC/ºF

0.0 0.0
0 500 1000 1500 2000 2500 3000 3500 0 2000 4000 6000 8000 10000
Altitude (meters) Altitude (feet)

Operation At Elevated Temperature And Altitude: Operation At Elevated Temperature And Altitude:
For Standby/Prime Operation above these conditions, derate by an additional For Standby/Prime Operation above these conditions, derate by an additional
6% per 300 m (1000 ft), and 19% per 10o C (18o F). 7% per 300 m (1000 ft), and 14% per 10o C (18o F).
For Continuous Operation above these conditions, derate by an additional 7% For Continuous Operation above these conditions, derate by an additional 9%
per 300 m (1000 ft), and 22% per 10o C (18o F). per 300 m (1000 ft), and 19% per 10o C (18o F).
 G-DRIVE
QSK
Cummins Inc. 3
Engine Data Sheet DATA SHEET : DS-6726
ENGINE MODEL: QSK50 G4 NR2 CONFIGURATION NUMBER: DATE : 24Jul09
PERFORMANCE CURVE : FR-6726
INSTALLATION DIAGRAM CPL NUMBER
• Fan to Flywheel: 3170631 • Engine Critical Parts List: 42771

GENERAL ENGINE DATA

Type ............................................................................................................................................................... 4-Cycle; 60 Vee; 16-Cyliner Diesel
Aspiration ....................................................................................................................................................... Turbocharged and Low Temperature
Aftercooled (2 Pump/2 Loop)
Bore x Stroke.............................................................................................................. — in x in (mm x mm) 159 x 159 (6.25 x 6.25)
Displacement.............................................................................................................................. — in3 (litre) 50.3 (3067)
Compression Ratio........................................................................................................................................ 15.0 : 1

Dry Weight (Approximate),

Fan to Flywheel Engine (with SAE 0 Flywheel and Flywheel Housing).............................. — lb (kg) 11927 (5410)
Wet Weight (Approximate),
Fan to Flywheel Engine.......................................................................................................... — lb (kg) 12593 (5712)

Moment of Inertia of Rotating Components

• with FW 6066 Flywheel .......................................................................................... — lbm • ft2 (kg • m2) 301 (12.7)
• with FW 6057 Flywheel........................................................................................... — lbm • ft2 (kg • m2) 515 (21.7)
Center of Gravity from Rear Face of Block............................................................................... — in (mm) 47.5 (1206)
Center of Gravity Above Crankshaft Centerline ....................................................................... — in (mm) 11 (279)
Maximum Static Loading at Rear Main Bearing.......................................................................... — lb (kg) 2000 (908)

ENGINE MOUNTING
Maximum Bending Moment at Rear Face of Block ......................................................... — lb • ft (N • m) 4500 (6100)

EXHAUST SYSTEM
Maximum Back Pressure..................................................................................................... — in Hg (kPa) 2 (6.8)

AIR INDUCTION SYSTEM

Maximum Intake Air Restriction
• with Dirty Filter Element.................................................................................................. — in H2O (kPa) 25 (6.2)
• with Clean Filter Element................................................................................................ — in H2O (kPa) 15 (3.7)

COOLING SYSTEM
Coolant Capacity — Engine ........................................................................................... — US gal (litre) 37 (140)
Minimum Pressure Cap (for Cooling Systems with less than 2m [6 ft.] Static Head) .......... — psi (kPa) 14 (96)
Maximum Static Head of Coolant Above Engine Crank Centerline ............................................ — ft (m) 60 (18.3)

Jacket Water Circuit Requirements:

Maximum Coolant Friction Head External to Engine — 1500/1800 rpm.............................. — psi (kPa) 7/10 (48/69)
Maximum Top Tank Temperature for Standby / Prime Power ................................................. — °F (°C) 220/212 (104/100)
Thermostat (Modulating) Range ................................................................................................. — °F (°C) 180-200 (82-93)

Aftercooler Circuit Requirements:

Coolant Capacity — Aftercoolers.................................................................................. — US gal (litre) 9 (34)
Maximum Coolant Friction Head External to Engine — 1500/1800 rpm.............................. — psi (kPa) 5/7 (35/48)
Maximum Inlet Water Temperature to Aftercoolers @ 25 °C (77 °F) .......................................— °F (°C) 120 (49)
Maximum Inlet Water Temperature to Aftercoolers for Standby / Prime Power .......................— °F (°C) 160/150 (71/66)
Thermostat (Modulating) Range .................................................................................................. — °F (°C) 115-135 (46-57)

LUBRICATION SYSTEM
Oil Pressure @ Idle Speed .................................................................................................... — psi (kPa) 20 (138)
@ Governed Speed ......................................................................................... — psi (kPa) 50-70 (345-483)
Maximum Oil Temperature.......................................................................................................... — °F (°C) 250 (121)
Oil Capacity with OP 6100 Oil Pan : Low - High.............................................................. — US gal (litre) 46-54 (174-204)
Total System Capacity (Including Filter) ........................................................................... — US gal (litre) 62 (235)
 G-DRIVE
QSK
4
FUEL SYSTEM
Type Injection System.................................................................................................................................................................. Cummins MCRS
Maximum Restriction at Lift Pump(clean/dirty filter)........................................................................................ — in Hg (kPa) 5.0/9.0 (17/34)
Maximum Allowable Head on Injector Return Line (Consisting of Friction Head and Static Head) — in Hg (kPa) 10.0 (34)
Maximum Fuel Flow to Injector Pump @1500 rpm/ 1800 rpm............................................................... — US gph (litre/hr) (221/241) (837/912)
Maximum Return Fuel Flow @1500 rpm/ 1800 rpm................................................................................ — US gph (litre/hr) (116/124) (439/469)
Maximum Fuel Inlet Temperature .......................................................................................................................... — °F (°C) 160 (70)

ELECTRICAL SYSTEM
Cranking Motor (Heavy Duty, Positive Engagement) ................................................................................................ — volt 24
Battery Charging System, Negative Ground ........................................................................................................ — ampere 55
Maximum Allowable Resistance of Cranking Circuit ............................................................................................... — ohm .002
Minimum Recommended Battery Capacity
• Cold Soak @ 0 °F to 32 °F (-18 °C to 0 °C) ............................................................................................ — 0°F CCA 1800

COLD START CAPABILITY

Minimum Ambient Temperature for NFPA 110 Cold Start (90 degree °F Coolant Temperature) ..................... — °F (°C) 50 (10)
Minimum Ambient Temperature for Unaided Cold Start ........................................................................................— °F (°C) 45 (7)

PERFORMANCE DATA
All data is based on: • Engine operating with fuel system, water pump, lubricating oil pump, air cleaner and exhaust
silencer; not included are battery charging alternator, fan, and optional driven components.
• Engine operating with fuel corresponding to grade No. 2-D per ASTM D975.
• ISO 3046, Part 1, Standard Reference Conditions of:
Barometric Pressure : 100 kPa (29.53 in Hg) Air Temperature : 25 °C (77 °F)
Altitude : 110 m (361 ft) Relative Humidity : 30%
Steady State Stability Band at Any Constant Load ....................................................................................................... — % +/- 0.25
Estimated Free Field Sound Pressure Level of a Typical Generator Set;
Excludes Exhaust Noise; at Rated Load and 7.5 m (24.6 ft); @ 1500/1800 rpm ....................................................— dBA 95/97.1 (est.)
Exhaust Noise at 1 m Horizontal from Centerline of Exhaust Pipe Outlet Upwards at 45 °.....................................— dBA 125/128 (est.)

STANDBY POWER PRIME POWER

60 hz 50 hz 60 hz 50 hz

Governed Engine Speed ................................................................. rpm 1800 1500 1800 1500

Engine Idle Speed............................................................................ rpm 700 - 900 700 - 900 700 - 900 700 - 900
Gross Engine Power Output..................................................... hp (kW) 2220 (1656) 1980 (1477) 1971 (1470) 1780 (1328)
Brake Mean Effective Pressure............................................... psi (kPa) 318 (2193) 340 (2344) 282 (1944) 306 (2110)
Piston Speed ........................................................................ ft/min (m/s) 1875 (9.5) 1562 (7.9) 1875 (9.5) 1562 (7.9)
Friction Horsepower.................................................................. hp (kW) 225 (168) 155 (116) 225 (168) 155 (116)
Engine Water Flow at Stated Friction Head External to Engine:
• 4 psi Friction Head................................................ US gpm (litre/s) 536 (34) 448 (28) 536 (34) 448 (28)
• Maximum Friction Head ....................................... US gpm (litre/s) 500 (32) 416 (26) 500 (32) 416 (26)
Engine Data
Intake Air Flow...................................................................... cfm (litre/s) 4940 (2335) 4315 (2040) 4780 (2255) 4150 (1960)
Exhaust Gas Temperature ......................................................... °F (°C) 915 (495) 955 (515) 835 (445) 915 (495)
Exhaust Gas Flow................................................................ cfm (litre/s) 12225 (5770) 10935 (5160) 11200 (5290) 10165 (4800)
Air to Fuel Ratio......................................................................... air : fuel 27.1 : 1 26.5 1 29.7 : 1 28.1 : 1
Radiated Heat to Ambient .............................................. BTU/min (kW) 9485 (170) 8520 (150) 8335 (150) 7725 (140)
Heat Rejection to Engine Jacket Radiator..................... BTU/min (kW) 38815 (685) 34495 (610) 34770 (615) 32275 (570)
Heat Rejection to Exhaust .............................................. BTU/min (kW) 68820 (1210) 64950 (1145) 58625 (1030) 58860 (1035)
Heat Rejected to Fuel*.................................................... BTU/min (kW) 522 (9) 475 (8) 522 (9) 475 (8)
Engine Aftercooler Data
Heat Rejection to Coolant............................................... BTU/min (kW) 25720 (455) 21035 (370) 22955 (405) 18590 (330)
Aftercooler Water Flow at Stated Friction Head External to Engine
• 2 psi Friction Head ................................................ US gpm (litre/s) 159 (10) 123 (8) 159 (10) 123 (8)
• Maximum Friction Head ....................................... US gpm (litre/s) 142 (9) 121 (7.6) 142 (9) 121 (7.6)
* This is the maximum heat rejection to fuel.

N.A. - Not Available

N/A - Not Applicable to this Engine ENGINE MODEL : QSK50-G4 NR2
TBD - To Be Determined DATA SHEET : DS-6726
DATE : 24Jul09
Cummins Inc. Columbus, Indiana 47202-3005 CURVE NO. : FR-6726