Product Description

The Cummins 4BT3.9-G1 Generator Drive Engine is a 3.9L, 4-cylinder, turbocharged diesel engine designed for generator set power generation. Delivering up to 40 kW (54 HP) standby and 36 kW (48 HP) prime power at 1500 rpm, this compact engine offers efficient, reliable, and durable performance for small-to-medium generator applications.

Built with Cummins’ proven engineering, the 4BT3.9-G1 provides low fuel consumption, robust design, and easy maintenance, making it a trusted choice for both commercial and light industrial gensets.

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Specifications

• Engine Model: Cummins 4BT3.9-G1
• Application: Generator Drive Engine
• Displacement: 3.9 L
• Configuration: 4-cylinder, in-line, 4-cycle
• Bore × Stroke: 102 × 120 mm
• Compression Ratio: 17.3:1
• Aspiration: Turbocharged
• Fuel System: BYC A/RSV Mechanical Direct Injection

• Governor Regulation: ≤8%

Power Ratings (1500 rpm, 50Hz):

• Standby: 40 kW / 54 HP

• Prime: 36 kW / 48 HP

Fuel Consumption (1500 rpm):

• 100% Load (40 kW): 11.1 L/h

• 100% Load (36 kW): 10.0 L/h

Weight: ~321 kg (wet)

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Product Advantages

• Turbocharged Performance – Higher power density compared to naturally aspirated 4B3.9 models.
• Fuel Efficient – Only 11.1 L/h at full 40 kW load.
• Compact Size – Lightweight design (~321 kg) for easy genset integration.
• Durable & Reliable – Proven Cummins 4-cylinder platform for long service life.

• Global Support – Genuine Cummins parts and service available worldwide.

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Key Features

• Turbocharged for improved output and efficiency.
• Optimized for 1500 rpm, 50Hz generator sets.
• Stable frequency with governor regulation ≤8%.
• Mechanical direct injection fuel system for robust operation.

• Compact and versatile design for small-to-medium generator sets.

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Applications

The Cummins 4BT3.9-G1 Diesel Engine for Generator Sets is ideal for:

• Commercial Standby Generators – offices, retail, and small businesses.
• Light Industrial Power – workshops, farms, and small factories.
• Residential Backup Power – homes and rural electrification.

• Mobile & Rental Gensets – portable generator applications.

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Product Availability

The Cummins 4BT3.9-G1 Generator Drive Engine is available worldwide with Cummins warranty, technical service, and genuine spare parts, ensuring reliable and efficient long-term power generation.