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DCEC 4B3.9-G2-B G-Drive Engine

DCEC 4B3.9-G2-B generator drive engine is a 4-cylinders in line,3.9 liter four-strokes engine with 102mm bore and 120mm stroke. Equipped with BYC A pump and electronic governor, The prime power for 50 Hz generator set 1800 RPM of DCEC 4B3.9-G2-B generator drive engine is 30kW. 

As part of EMAC, SinoGen also provide complete power supply solutions that powered by DCEC, our ranges of products including open type generator set, silence type generator set, super silence type generator set, mobile trailer, complete power truck and complete power car for railways applications. We provide full life cycle services for all customers, from design to power system supply, from installation to commissioning, from after-sales service training to spare parts supply, from trouble shooting to overhaul technical support.

1. Efficient and fuel-saving: the cylinder bore adopts a platform mesh honing design; the perfect geometric structure effectively prevents oil leakage.
2. adopts advanced technologies such as new piston ring components and gasket crimping molding to reduce oil loss.
3. Manufacturing process: The cylinder block and cylinder head adopt integrated design, which eliminates the occurrence of engine water leakage and oil leakage.
4. The parts are about 40% less than other similar engines, and the failure rate is greatly reduced.
5. Strong power: adopts Holset supercharger with integral wastegate valve, low-speed response and strong power.
6. Advanced design and high-quality manufacturing, adaptable to severe operating conditions, high strength, and reliable operation under heavy load.

Technical Specifications

Basic Introduction of DCEC 4B3.9-G2-B G-Drive Engine                       

Engine Model:4B3.9-G2-B (-B means 1800 RPM engine)
Engine Type:4  Cylinders
Displacement:3.9 L
Rated Speed:1800 RPM
Aspiration Method:Naturally Aspirated
Emission Standard:N/A
Bore*Storke:102 mm * 120 mm
Packing Size(L*W*H):1080 mm * 625 mm * 1085 mm
Wet Weight:308 kg
Lead Time:15-30 Working Days
Payment Terms:T/T ,L/C
DCEC 4B3.9-G2 Generator Drive Engine Introduction 620×350

Engine Model

Standby Power

Prime Power

Fuel System


4B3.9-G127 kW @ 1500 RPM24 kW @ 1500 RPMBYC A Pump / RSV Mechanical GovernorNaturally Aspirated
4B3.9-G2-A27 kW @ 1500 RPM24 kW @ 1500 RPMBYC A Pump / Electronic GovernorNaturally Aspirated
4B3.9-G2-B33 kW @ 1800 RPM30 kW @ 1800 RPMBYC A Pump / Electronic GovernorNaturally Aspirated
4B3.9-G11-A22 kW @ 1500 RPM20 kW @ 1500 RPMWeifu A Pump /RSVNaturally Aspirated
4B3.9-G11-B26 kW @ 1800 RPM23 kW @ 1800 RPMWeifu A Pump /RSVNaturally Aspirated
4B3.9-G12-A30 kW @ 1500 RPM27 kW @ 1500 RPMWeifu A Pump/Electronic GovernorNaturally Aspirated
4B3.9-G12-B36 kW @ 1800 RPM33 kW @ 1800 RPMWeifu A Pump/Electronic GovernorNaturally Aspirated
4BT3.9-G140 kW @ 1500 RPM36 kW @ 1500 RPMNorth Oil A Pump /RSV Mechanical GovernorTurbocharging
4BT3.9-G2-A40 kW @ 1500 RPM36 kW @ 1500 RPMNorth Oil A Pump/Electronic GovernorTurbocharging
4BT3.9-G2-B44 kW @ 1800 RPM40 kW @ 1800 RPMNorth Oil A Pump/Electronic GovernorTurbocharging
4BTA3.9-G2-A64 kW @ 1500 RPM58 kW @ 1500 RPMBeiyou PB Pump /GAC 24V/12V Electronic GovernorPressurized Water is Air-Cooled
4BTA3.9-G2-B74 kW @ 1800 RPM67 kW @ 1800 RPMBeiyou PB Pump /GAC 24V/12V Electronic GovernorPressurized Water is Air-Cooled
4BTA3.9-G11-A80 kW @ 1500 RPM70 kW @ 1500 RPMNorth Oil PB Pump/Electronic GovernorPressurized Water is Air-Cooled
4BTA3.9-G11-B90 kW @ 1800 RPM80 kW @ 1800 RPMNorth Oil PB pump/Electronic GovernorTurbo Charging With Inter-Cooling
4BTA3.9-G1274 kW @ 1500 RPM67 kW @ 1500 RPMA Pump/Electronic GovernorTurbo Charging With Inter-Cooling
4BTA3.9-G1397 kW @ 1500 RPM87 kW @ 1500 RPMWeifu PW Pump/Electronic GovernorTurbo Charging With Inter-Cooling
4BTAA3.9-G3106 kW @ 1500 RPM96 kW @ 1500 RPMWeifu PW Pump/Electronic GovernorTurbocharged air-to-air cooling

General Infomation of DCEC 4B3.9-G2-B Generator Drive Engine

Engine Model4B3.9-G2-BPerformance Curve NumberFR93762
Code Revision Cpl3114Number Of Cylinders4  Cylinders
AspirationNaturally AspiratedDisplacement3.9 L
Fuel SystemBYC A Pump / Electronic GovernorGovernor Regulation≤5%
Bore * Storke102 mm*120 mmDry Weight308 kg
Prime Power40 HP (30 kW)Standby Power44 HP (33 kW)
Continuous PowerN/ACompression Ratio18.0:1

Installation Data of DCEC 4B3.9-G2-B Generator Drive Engine

Mass Moment Of Inertia Of Rotating Components0.143 kg·m²Center Of Gravity From Rear Face Of Block373 mm
Center Of Gravity Above Crankshaft Centerline163 mmMaximum (Static) Bending Moment At Rear Face Of Block1356 N.m
Maximum Exhaust Back Pressurer10 kPaLow Idle Speed950-1050 RPM
Ignition Order1-3-4-2

Engine Performance Data 1800 RPM / 60HZ of DCEC 4B3.9-G2-B Generator Drive Engine

Prime PowerStandbyPrime PowerStandby
Output Power30 kW33 kWFriction Loss Power11.9 kW11.9 kW
Idle Speed950-1050 RPM950-1050 RPMEngine Coolant Flow Rate2.8 litre/sec2.8 litre/sec
Piston Speed7.2 m/s7.2 m/sExtraction Flow78.5 litre/sec81.9 litre/sec
Lnlet Flow43 litre/sec43 litre/secAmbient Heat Loss WorkN/AN/A
Discharge Temperature326 ℃352 ℃Exhaust Heat Loss WorkN/AN/A
Heat Loss Work Of The Coolant32 kW35 kW
  DCEC 4B3.9-G2-B Generator Drive Engine

System Technical Data of DCEC DCEC 4B3.9-G2-B Generator Drive Engine

Air Inlet SystemMaximum Allowable Intake Resistance-Dirty Filter Element6.2 kPa
Maximum Allowable Intake Resistance-Clean Filter Element3.7 kPa
Lubrication SystemNormal Operating Oil Pressure Range-Low Idle Minimum Oil Pressure207 kPa
Normal Operating Oil Pressure Range-Maximum Oil Pressure at Rated Point345 kPa
Maximum Pan Oil Temperature121 ℃
Minimum Capacity Of Lubrication System10.9 litre
Fuel SystemType Of Fuel Pump SystemBYC A inline pump
Maximum Intake Resistance Of Oil Transfer Pump13.6 kPa
Maximum Oil Return Resistance Of Fuel Injector Return Pipe67.7 kPa
Maximum Fuel Return Flow Rate30 litre/hr
Cooling SystemEngine Coolant Volume (Engine Only)7.2 litre
Maximum Static Height Of Coolant Above Engine Crankshaft Centerline14 m
Standard Regulating Temperature Of Thermostat (Range)82-95 ℃
Minimum Cap Pressure69 kPa
Minimum Cap Pressure Maximum Engine Coolant Temperature At Reserve/Rated Power110/104 ℃
Maximum Engine External Cooling Cycle Resistance35kPa
Electric SystemStarter12 V24 V
Battery Charging System (Negative Ground)63 ampere40 ampere
Maximum Starting Circuit Resistance0.00075 ohm0.002 ohm
Minimum Battery Capacity-12℃ Or Above Cold625 0°F CCA312 0°F CCA

Scopes of Supply of DCEC 4B3.9-G2-B Generator Drive Engine

Air Intake System1. Air Intake ManifoldExhuast System1. Exhuast Manifold
2. Standard Air Filter2. Turbocharger
3. Water-Air Intercooler3. Exhuast Elbow
Starting System1. Starter MotorCharging System1. Charging Alternator
2. Starter Rely2. N/A
Lubricating System1. Oil PumpCooling System1. Water Pump
2. Oil Filter2. Engine Fan
3. N/A3. Standard Radiator
Engine Shut-Down System1. Engine Fuel Shut-Off SolenoidPower Output System1. Flywheel
2. N/A2. Standard Flywheel Housing
Fuel System1. Fuel Transfer Pump
2. High-Pressure Fuel Pump
3. Fuel Filter

Optional Accessories of DCEC 4B3.9-G2-B Generator Drive Engine

Air Intake System1. Air Intake Pre-HeaterExhuast System1. Muffler & Bellows
2. Air Intake Shut-Off Valve2. Spark Arrestor Type Muffler & Bellows
3. Heavy-Duty Air Filter3. DPF System
4. Plateau Type Air Filter4. N/A
Fuel System1. Coarse FilterLubricating System1. Oil Pre-Heater
2. Fuel Pre-Heater2. N/A
Starting System1. Manual Magnetic DC ContactorCooling System1. Silent Type Radiator
2. Dual Ears Flywheel Housing2. Plateau Radiator
3. Spring Starter Motor3. Salt-Spray Resistant Radiator
4. Air Starter Motor4. Coolant Pre-Heater
5. Hydraulic Starter Motor5. Jacket Water Heater
6. Manual Magnetic DC Contactor6. N/A

As part of EMAC, SinoGen focusing on generator set related business, from Generator drive engine power pack to complete generator set, from generator control panel to synchronizing cabinet, from super silent type generator set to mobile power trailer, SinoGen provides professional one-stop solution for everything customer needed for generator set.
For more information of our complete generator set products, you are welcome to visit SinoGen homepage:

Modifiable components of DCEC 4B3.9-G2-B Generator Drive Engine

Air Intake System1. Installation Position of Air FilterCharging System1. 12V Charging Alternator for 12V Electric System
2. Upgrade to Heavy-Duty Type Air Fitler2. Explosion-Proof Charging Alternator
Exhuast System1. Position of TurbochargerLubricating System1. Oil Pan Position
2. Water-Cooled Exhuast Manifold2. Number of Dipstick
3. Water-Cooled Turbocharger3. Position of Dipstick
Fuel System1. Upgrade to Fuel Fitler that Integrated with Fuel Transfer PumpStarting System1. 12V Starter Motor for 12V Electric System
Engine Shut-Down System1. 12V Solenoid for 12V Electric SystemPower Output System1. Size of Flywheel Housing and Flywheel.
2. Explosion-Proof Solenoid2. Dual-Ear Flywheel Housing (For Twin-Starter System)

Note: All Above Data are Just for Referenece, All Data Might Change Without Notices or Update, Please Contact Our Sales Team to Confirm All Details Via WhatsApp or Email.

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Sales Team

Generator Engine - Mr. Haden Wu

Marine Engine - Mrs. Hailey Tang

Automotive Engine - Mr. Wells Luo

Industrial Engine - Mrs. Luna Fu

Pump Engine - Miss. Zora Zhou

Engine Parts-Miss. Nora

Sales Director - Mr. Jasper Lee      

Service Team

Technical Service - Mr. Vin Hu

Customer Service - Mrs. Wendy Fu

Contact EMAC Now!

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