Product Description

The Cummins 4B3.9-G11 Generator Drive Engine is a 3.9L, 4-cylinder, naturally aspirated diesel engine developed by Dongfeng Cummins. It delivers up to 26 kW (35 HP) at 1800 rpm and 22 kW (29 HP) at 1500 rpm, making it an ideal solution for small generator sets in residential, commercial, and light industrial applications.

With its direct injection fuel system, electronic governor, and compact design, the 4B3.9-G11 provides low fuel consumption, high reliability, and easy maintenance for long-term power generation.

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Specifications

• Engine Model: Cummins 4B3.9-G11
• Application: Generator Drive Engine
• Displacement: 3.9 L
• Configuration: 4-cylinder, in-line, 4-cycle
• Bore × Stroke: 102 × 120 mm
• Compression Ratio: 18.0:1
• Aspiration: Naturally Aspirated
• Fuel System: Weifu A Pump Direct Injection, RSV Governor

• Governor Regulation: ≤6%

Power Ratings:

• 1500 rpm (50Hz): Standby: 22 kW/ 29 HP ; Prime: 20 kW/ 27 HP

• 1800 rpm (60Hz): Standby: 26 kW/ 35 HP ; Prime: 23 kW/ 31 HP

Fuel Consumption (1500 rpm):

• 1500 rpm (50Hz): Standby: 6.1 L/h (230 g/kW.h); Prime: 5.7 L/h (236 g/kW.h)

• 1800 rpm (60Hz): Stanby: 7.8 L/h ( 247 g/kW.h); Prime: 7.1 L/h ( 256g/kW.h)

Weight: ~308 kg (wet)

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Product Advantages

• Fuel Efficiency – Low fuel use: 6.1 L/h (22 kW at 1500 rpm) and 7.8 L/h (26 kW at 1800 rpm).
• Compact & Lightweight – Only 308 kg wet weight, suitable for small genset integration.
• Durable Design – Proven 4-cylinder, naturally aspirated Cummins build.
• Low Maintenance – Simple direct injection fuel system with fewer moving parts.

• Trusted Brand – Supported by Cummins’ global network with genuine parts.

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Key Features

• Dual-speed operation: 1500 rpm (50Hz) and 1800 rpm (60Hz).
• Electronic governor with ≤6% regulation.
• Weifu A Pump direct injection system.
• Designed to meet GB/T18297 test conditions.

• Reliable starting with 12V/24V heavy-duty starter motor.

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Applications

The Cummins 4B3.9-G11 Diesel Engine for Generator Sets is widely used in:

• Residential Standby Generators – home backup power.
• Commercial Power Systems – small businesses and offices.
• Agricultural & Rural Power – farms and off-grid applications.

• Light Industrial Gensets – workshops, telecom towers, and portable power units.

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Product Availability

The Cummins 4B3.9-G11 Generator Drive Engine is available worldwide with full Cummins warranty, service support, and genuine spare parts, ensuring reliability in long-term power generation.