Product Description

The Cummins 4BTA3.9-G2 Generator Drive Engine is a 3.9L, 4-cylinder, turbocharged and aftercooled diesel engine designed for generator set power generation. With ratings from 58–64 kW at 1500 rpm and 67–74 kW at 1800 rpm, this engine provides reliable, efficient, and durable power for small to medium generator sets.

Featuring the Weifu PW direct injection system, electronic governor, and robust Cummins build quality, the 4BTA3.9-G2 ensures low fuel consumption, stable performance, and long-term dependability.

---

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 (Jacket Water Cooled)
• Fuel System: Weifu PW Direct Injection

• Governor Regulation: ≤3%

Power Ratings:

• 1500 rpm (50Hz): Standby: 64 kW/ 86 HP ; Prime: 58 kW/ 78 HP

• 1800 rpm (60Hz): Standby: 74 kW/ 99 HP; Prime: 67 kW/ 90 HP

Fuel Consumption:

• (1500 rpm): 100% Load (64/58 kW): 16.5 / 14.9 L/h
• (1800 rpm): 100% Load (74/67 kW): 19.4 / 17.4 L/h

Weight: ~355 kg (wet)

---

Product Advantages

• Flexible Ratings – Dual-speed operation (1500 & 1800 rpm) covering both 50Hz & 60Hz gensets.
• Fuel Efficient – Low consumption from 4.8 to 19.4 L/h depending on load.
• Turbocharged & Aftercooled – Ensures higher output and thermal efficiency.
• Compact & Lightweight – 355 kg wet weight makes it ideal for small gensets.

• Global Support – Genuine Cummins engine backed by worldwide service and spare parts.

---

Key Features

• Turbocharged with jacket water aftercooling for maximum efficiency.
• Electronic governor with precise control (≤3% regulation).
• Robust 4-cylinder design ensures reliability and durability.
• Direct injection fuel system for improved fuel economy.

• Optimized for both standby and prime power generator applications.

---

Applications

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

• Small Commercial Backup Power – offices, retail shops, and telecom sites.
• Light Industrial Power – workshops, farms, and rural electrification.
• Residential Power – home backup during outages.

• Portable & Rental Generators – compact mobile gensets.

---

Product Availability

The Cummins 4BTA3.9-G2 Generator Drive Engine is available worldwide with genuine Cummins warranty, service support, and spare parts, ensuring reliable long-term operation in all power generation applications.