Product Description

The Cummins 4BTA3.9-G2 Generator Drive Engine is a 3.9L, 4-cylinder, turbocharged and aftercooled diesel engine designed for reliable generator set power generation. Delivering 50–55 kW at 1500 rpm and 60–66 kW at 1800 rpm, it is ideal for small-to-medium gensets requiring dependable standby or prime power.

With its BYC direct injection fuel system, electronic governor, and compact design, the 4BTA3.9-G2 ensures low fuel consumption, stable output, and long-term durability for commercial and light industrial applications.

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Specifications

• Engine Model: Cummins 4BTA3.9-G2
• 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 & Aftercooled
• Fuel System: BYC A Direct Injection, Electronic Governor

• Governor Regulation: ≤5%

Power Ratings:

• (50Hz): Standby: 55 kW/ 74 HP@1500 rpm; Prime: 50 kW/ 67 HP@1500 rpm

• (60Hz): Standby: 66 kW/ 88 HP@1800 rpm; Prime: 60 kW/ 80 HP@1800 rpm

Fuel Consumption :

• 1500 rpm: 100% Load (55/50 kW): 14.1/ 12.9 L/h

• 1800 rpm: 100% Load (66/60 kW): 17.4/ 15.9 L/h

Weight: ~350 kg (wet)

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Product Advantages

• Flexible Power Range – Covers 50 to 66 kW, suitable for small gensets.
• Fuel Efficiency – Low fuel use from 4.2 to 17.4 L/h depending on load.
• Turbocharged & Aftercooled – Higher efficiency and output compared to naturally aspirated models.
• Compact & Lightweight – At ~350 kg, easy integration into compact gensets.

• Trusted Cummins Reliability – Backed by Cummins’ global parts and service network.

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Key Features

• Turbocharged & aftercooled for maximum thermal efficiency.
• Dual-speed capability (1500/1800 rpm) for 50Hz & 60Hz markets.
• Electronic governor with ≤5% regulation for stable frequency.
• BYC direct injection fuel system for robust performance.

• Compact build for light commercial and industrial generator sets.

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Applications

The Cummins 4BTA3.9-G2 Diesel Engine for Generator Sets is ideal for:

• Commercial Backup Power – offices, retail, and telecom sites.
• Light Industrial Power – workshops, farms, and small plants.
• Residential Standby Power – homes and apartments.

• Portable & Rental Gensets – temporary or mobile power units.

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Product Availability

The Cummins 4BTA3.9-G2 Generator Drive Engine is available worldwide with genuine Cummins warranty, service, and spare parts support, ensuring reliable and efficient power generation.