Product Description

The Cummins 4B3.9-G2 Generator Drive Engine is a 3.9L, 4-cylinder, naturally aspirated diesel engine designed for small generator sets. Delivering up to 33 kW (44 HP) at 1800 rpm and 27 kW (36 HP) at 1500 rpm, it provides reliable, fuel-efficient performance for light commercial, residential, and standby power generation applications.

With its BYC direct injection fuel system, compact design, and Cummins engineering quality, the 4B3.9-G2 ensures low fuel consumption, ease of maintenance, and long service life.

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Specifications

• Engine Model: Cummins 4B3.9-G2
• 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: BYC A Direct Injection, Electronic Governor

Power Ratings:

• 1500 rpm (50Hz): Standby: 27 kW/ 36 HP; Prime: 24 kW/ 32 HP

• 1800 rpm (60Hz): Standby: 33 kW/ 44 HP; Prime: 30 kW/ 40 HP

Fuel Consumption ():

• 1500 rpm (50Hz): Standby: 7.5 L/h ( 227 g/kW.h); Prime: 6.7 L/h (229 g/kW.h)

• 1800 rpm (60Hz): Standby: 9.4 L/h (236 g/kW.h); Prime: 8.6 L/h (238 g/kW.h)

Weight: ~308 kg (wet)

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Product Advantages

• Compact Power – Delivers up to 33 kW output for small generator sets.
• Fuel Efficient – Consumption as low as 2.7–3.6 L/h at 25% load.
• Reliable Design – 4-cylinder in-line engine with proven Cummins durability.
• Ease of Maintenance – Naturally aspirated system with fewer components.

• Global Support – Backed by Cummins’ worldwide service and parts network.

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Key Features

• Dual-speed operation at 1500 rpm (50Hz) and 1800 rpm (60Hz).
• Electronic governor with regulation ≤5%.
• Compact, lightweight build ideal for small gensets.
• BYC direct injection fuel system for efficiency.

• Meets GB/T18297 test conditions for certified performance.

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Applications

The Cummins 4B3.9-G2 Diesel Engine for Generator Sets is ideal for:

• Small Standby Power – homes, offices, and retail shops.
• Light Industrial Power – farms, workshops, and rural operations.
• Commercial Backup – small business facilities.

• Portable and Rental Gensets – mobile and temporary power solutions.

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Product Availability

The Cummins 4B3.9-G2 Generator Drive Engine is available globally with full Cummins warranty, service, and genuine spare parts, ensuring long-term reliability and efficiency in power generation.