Cummins Inc.

Basic Engine Model:

Curve Number:

G-DRIVE

4B3.9-G2

FR-90382 @ 1500 RPM

FR-90381 @ 1800 RPM

B3.9
1

Columbus, Indiana 47201

Engine Critical Parts List:

Date:

CPL: 1522

19Oct04

ENGINE PERFORMANCE CURVE

Displacement : 3.9 litre (239.3

in3

Bore : 102 mm (4.02 in.) Stroke : 120 mm (4.72 in.)

No. of Cylinders : 4

Aspiration : Naturally Aspirated

Engine Speed

Standby Power

Prime Power

Continuous Power

RPM

kWm

BHP

kWm

BHP

kWm

BHP

1500

41

55

37

50

30

40

1800

51

68

45

60

30

40

Emissions Certification:This engine complies with certain emissions requirements established by US EPA/CARB in accordance with the OEM TPEM
provision of 40CFR89.102 for Tier 1 emission limits. See Exhaust Emissions Data Sheet for conformance specifications.
1800 RPM Only

Engine Performance Data @ 1500 RPM

OUTPUT POWER
%

kWm

Litre/hour

FUEL CONSUMPTION
kg/
kWmh

lb/
BHPh

litre/
hour

U.S. Gal/
hour

55

0.224

0.369

10.8

2.9

BHP

1500 RPM
(FR-90382)

STANDBY POWER
100

41

PRIME POWER
100

37

50

0.215

0.351

9.4

2.5

75

28

38

0.217

0.353

7.2

1.9

50

19

25

0.236

0.396

5.3

1.4

25

12

0.284

0.470

3.0

0.8

0.216

0.358

7.6

2.0

CONTINUOUS POWER
100

30

40

Gross Engine Power Output - kWm

Engine Performance Data @ 1800 RPM

OUTPUT POWER

FUEL CONSUMPTION

U.S. Gallons/hour
%

kWm

kg/
kWmh

lb/
BHPh

litre/
hour

U.S. Gal/
hour

68

0.226

0.374

13.6

3.6

BHP

STANDBY POWER
100

51

1800 RPM
(FR-90381)

PRIME POWER
100

45

60

0.217

0.359

11.5

3.0

75

34

45

0.223

0.372

8.9

2.4

50

22

30

0.247

0.400

6.4

1.7

25

11

15

0.307

0.497

4.0

1.1

0.227

0.376

8.0

2.1

CONTINUOUS POWER
100

30

40

Gross Engine Power Output - BHP

CONVERSIONS:

(Litres = U.S. Gal x 3.785)

(Engine kWm = BHP x 0.746)

(U.S. Gal = Litres x 0.2642)

(Engine BHP = Engine kWm x 1.34)

Data shown above represent gross engine performance capabilities obtained and corrected in accordance with ISO-3046 conditions of 100 kPa (29.53 in Hg)
barometric pressure [110 m (361 ft) altitude], 25 C (77 F) air inlet temperature, and relative humidity of 30% with No. 2 diesel or a fuel corresponding to ASTM D2.
See reverse side for application rating guidelines.
The fuel consumption data is based on No. 2 diesel fuel weight at 0.85 kg/litre (7.1 lbs/U.S. gal).
Power output curves are based on the engine operating with fuel system, water pump and lubricating oil pump; not included are battery charging alternator, fan,
optional equipment and driven components.

TECHNICAL DATA DEPT.

CERTIFIED WITHIN 5%

CHIEF ENGINEER

G-DRIVE

B3.9
2

4B3.9-G2

POWER RATING APPLICATION GUIDELINES

FOR
GENERATOR DRIVE ENGINES
These guidelines have been formulated to ensure proper application of generator drive engines
in A.C. generator set installations. Generator drive engines are not designed for and shall not be
used in variable speed D.C. generator set applications.

STANDBY POWER RATING is 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 with the
public utility at the Standby Power rating.
This rating should be applied where
reliable utility power is available. A
standby rated engine should be
sized for a maximum of an 80%
average load factor and 200 hours
of operation per year. This includes
less than 25 hours per year at the
Standby Power rating. Standby
ratings should never be applied
except in true emergency power
outages. Negotiated power outages
contracted with a utility company
are not considered an emergency.

CONTINUOUS POWER RATING is 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.

PRIME POWER RATING is 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 POWER
Prime Power is available for an unlimited number of
hours per year in a variable load application. Variable
load should not exceed a 70% average of the Prime
Power rating during any operating period of 250
hours.
The total operating time 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.
LIMITED TIME RUNNING PRIME POWER
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 curtailment.
Engines may be operated in parallel to the public
utility up to 750 hours per year at power levels never
to exceed the Prime Power rating. The customer
should be aware, however, that the life of any engine
will be reduced by this constant high load operation.
Any operation exceeding 750 hours per year at the
Prime Power rating should use the Continuous Power
rating.

Reference Standards:
BS-5514 and DIN-6271 standards are based on ISO-3046.
Operation At Elevated Temperature And Altitude:
The engine may be operated at:
1800 RPM up to 500 ft (150 m) and 77 oF (25 o C) without power
deration.
1500 RPM up to 500 ft (150 m) and 77 oF (25 o C) without power
deration.
For sustained operation above these conditions, derate by 3% per 1,000 ft
(300 m), and 1% per 10 o F (2% per 11 oC), and 1.5% per 10% relative
humidity above 30%.

G-DRIVE

B3.9
3

Cummins Inc.
Engine Data Sheet
ENGINE MODEL :

4B3.9-G2

CONFIGURATION NUMBER : D381004GX02

INSTALLATION DIAGRAM
Fan to Flywheel
: 3626443

DATA SHEET : DS-90381

DATE : 19Oct04
PERFORMANCE CURVE : FR-90382 @1500
FR-90381 @1800

CPL NUMBER
Engine Critical Parts List

1522

GENERAL ENGINE DATA

Type................................................................................................................................ ................................
Aspiration........................................................................................................................................................
Bore x Stroke............................................................................................................... in x in (mm x mm)
Displacement .............................................................................................................................. in3 (litre)
Compression Ratio ........................................................................................................................................
Dry Weight
Fan to Flywheel Engine .........................................................................................................
Heat Exchanger Cooled Engine............................................................................................
Wet Weight
Fan to Flywheel Engine .........................................................................................................
Heat Exchanger Cooled Engine............................................................................................

4-Cycle; In-line; 4-Cylinder Diesel

Natural
4.02 x 4.72 (102 x 120)
239.3 (3.92)
17.3 : 1

lb (kg)
lb (kg)

680

lb (kg)
lb (kg)

715

Moment of Inertia of Rotating Components

with FW 9420 Flywheel ........................................................................................... lbm ft2 (kg m 2)
with FW 9017 Flywheel............................................................................................ lbm ft2 (kg m 2)
Center of Gravity from Rear Face of Flywheel Housing........................................................... in (mm)
Center of Gravity Above Crankshaft Centerline........................................................................ in (mm)
Maximum Static Loading at Rear Main Bearing ......................................................................... lb (kg)

(308)
N/A
(324)
N/A

21.6
17.1
14.7
6.4
N.A.

(0.91)
(0.72)
(373)
(163)
N.A.

1000

(1356)

(76)

20
10
12

(508)
(254)
(305)

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

EXHAUST SYSTEM
Maximum Back Pressure............................................................................................... in Hg (mm Hg)

AIR INDUCTION SYSTEM

Maximum Intake Air Restriction
with Dirty Filter Element.......................................................................................... in H2O (mm H2O)
with Normal Duty Air Cleaner and Clean Filter Element...................................... in H2O (mm H2O)
with Heavy Duty Air Cleaner and Clean Filter Element........................................ in H2O (mm H2O)

COOLING SYSTEM
Coolant Capacity Engine Only.................................................................................... US gal (litre)
with HX 9911 Heat Exchanger...................................................... US gal (litre)
Maximum Coolant Friction Head External to Engine

1800 rpm ................................. psi (kPa)

1500 rpm ................................. psi (kPa)
Maximum Static Head of Coolant Above Engine Crank Centerline ............................................ ft (m)
Standard Thermostat (Modulating) Range................................................................................. F (C)
Minimum Pressure Cap............................................................................................................ psi (kPa)
Maximum Top Tank Temperature for Standby / Prime Power................................................. F (C)
Minimum Raw Water Flow @ 90F to HX 9908 Heat Exchanger....................... US gpm (litre / min)
Maximum Raw Water Inlet Pressure at HX 9908 Heat Exchanger....................................... psi (kPa)

1.9

(7.2)
N/A

5
4
46
180 - 203
10
220 / 212

(35)
(28)
(14)
(82 - 95)
(69)
(104 / 100)
N/A
N/A

30
50
250
2.5 - 2.25
2.88

(207)
(345)
(121)
(9.5 - 8.5)
(10.9)
40
40
40

LUBRICATION SYSTEM
Oil Pressure @ Idle Speed..................................................................................................... psi (kPa)
@ Governed Speed.......................................................................................... psi (kPa)
Maximum Oil Temperature ......................................................................................................... F (C)
Oil Capacity with OP 9017 Oil Pan : High - Low ............................................................... US gal (litre)
Total System Capacity (Including Full Flow Filter)............................................................ US gal (litre)
Angularity of OP 9017 Oil Pan
Front Down ......................................................................................
Front Up...........................................................................................
Side to Side .....................................................................................

G-DRIVE

B3.9
4
FUEL SYSTEM
Type Injection System...................................................................................................................................................................... Stanadyne DB4 Direct Injection
Maximum Restriction at Lift Pump..................................................................................................................... in Hg (mm Hg)
4
(102)
Maximum Allowable Head on Injector Return Line (Consisting of Friction Head and Static Head).............. in Hg (mm Hg)
20
(508)
Maximum Fuel Flow to Injection Pump......................................................................................................... US gph (litre / hr)
8
(30)

ELECTRICAL SYSTEM
Cranking Motor (Heavy Duty, Positive Engagement)......................................................................................................... volt
Battery Charging System, Negative Ground ............................................................................................................... ampere
Maximum Allowable Resistance of Cranking Circuit......................................................................................................... ohm
Minimum Recommended Battery Capacity
Cold Soak @ 10 F (-12 C) and Above ............................................................................................................ 0F CCA

12
63
0.00075

24
40
0.002

625

312

50
10

(10)
(-12)

COLD START CAPABILITY

Minimum Ambient Temperature for Aided (with Coolant Heater) Cold Start within 10 seconds ............................... F (C)
Minimum Ambient Temperature for Unaided Cold Start............................................................................................... F (C)

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 .............................................................................................................. %

Estimated Free Field Sound Pressure Level of a Typical Generator Set;
Excludes Exhaust Noise; at Rated Load and 7.5 m (24.6 ft); 1800 rpm / 1500 rpm.............................................. dBA
Exhaust Noise at 1 m Horizontally from Centerline of Exhaust Pipe Outlet Upwards at 45 ......................................... dBA

STANDBY POWER
60 hz
50 hz
Governed Engine Speed.............................................................. rpm
Engine Idle Speed ....................................................................... rpm
Gross Engine Power Output........................................... BHP (kWm)
Brake Mean Effective Pressure ........................................... psi (kPa)
Piston Speed................................................................. ft / min (m / s)
Friction Horsepower ......................................................... HP (kW m)
Engine Water Flow at Stated Friction Head External to Engine:
1 psi Friction Head .......................................... US gpm (litre / s)
Maximum Friction Head.................................. US gpm (litre / s)

1800
950 - 1150
68
(51)
125
(863)
1416
(7.2)
16 (11.9)
45
35

(2.8)
(2.2)

1500
950 - 1150
55
(41)
121
(835)
1180
(6.0)
11
(8.2)
35
26

(2.2)
(1.6)

+/- 0.50
N.A.
N.A.

PRIME POWER
60 hz
50 hz
1800
950 - 1150
60
(45)
110
(759)
1416
(7.2)
16 (11.9)
45
35

(2.8)
(2.2)

1500
950 - 1150
50
(37)
110
(759)
1180
(6.0)
11
(8.2)
35
26

(2.2)
(1.6)

Engine Data with Dry Type Exhaust Manifold

Intake Air Flow ................................................................ cfm (litre / s)
Exhaust Gas Temperature...................................................... F (C)
Exhaust Gas Flow .......................................................... cfm (litre / s)
Air to Fuel Ratio..................................................................... air : fuel
Radiated Heat to Ambient ..................................... BTU / min (kWm)
Heat Rejection to Coolant...................................... BTU / min (kWm)
Heat Rejection to Exhaust..................................... BTU / min (kWm)

103
(49)
1204
(651)
306
(144)
18.0 : 1
950
(17)
1735
(31)
2480
(44)

84
(40)
1179
(637)
247
(117)
17.4 : 1
720
(13)
1440
(25)
1830
(32)

105
(50)
1071
(577)
285
(134)
21.1 : 1
686
(12)
1465
(26)
2160
(38)

86
(41)
1009
(543)
225
(106)
21.3 : 1
670
(12)
1230
(22)
1620
(29)

N.A. - Data is Not Available

N/A - Not Applicable to this Engine
TBD - To Be Determined

Cummins Inc.

Columbus, Indiana 47202-3005

ENGINE MODEL : 4B3.9-G2

DATA SHEET : DS-90381
DATE : 19Oct04
CURVE NO. : FR-90382 @ 1500 RPM
FR-90381 @ 1800 RPM