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FAWDE 4DW91 29D Engine for 20–30kVA Generator Sets | Specs, Parts & Export Supply
FAW 4DW91 29D engine is a four-cylinder, naturally aspirated diesel engine manufactured by FAWDE (FAW Jiefang Powertrain Division, Wuxi Diesel Engine Works). It is specifically engineered for 20–30kVA generator set applications, delivering 21 kW prime power at 1500 rpm with a displacement of 2.54 liters.
This page provides complete technical specifications, generator set integration data, genuine FAWDE Engine Parts sourcing information, and export supply details for buyers worldwide.
Whether you are a generator set assembler, a fleet operator, or a spare parts distributor, this guide covers everything you need to know about the FAWDE 4dw91 29d platform.
The FAW 4DW91 29D belongs to FAWDE’s 4DW engine family, a series of light-duty diesel engines produced at the Wuxi Diesel Engine Works in Jiangsu Province, China. FAWDE Powertrain Division is the research, development, production, and sales base for FAW’s heavy-, medium-, and light-duty engines, gearboxes, and axles, and serves as an important business unit within the China FAW Group commercial vehicle portfolio.
The 4dw91 29d Engine is part of the 4DW generator engine lineup, which also includes the 4DW81-23D, 4DW92-35D, 4DW92-39D, and 4DW93-42D models. These engines are widely deployed in stationary power generation, fire pump drives, refrigeration units, and mobile gensets. The 4DW91-29D occupies a strategic position in this family: it is the smallest displacement engine in the 90mm bore series and is optimised for the 20–30kVA output band, making it one of the most popular choices for small commercial and residential backup power systems.
These FAW 4dw91 29d Specs are sourced from FAWDE generator engine documentation and apply to the standard 1500 rpm mechanical governor configuration. For 1800 rpm / 60Hz applications, FAWDE offers the 4DW91-38D variant rated at 28 kW, while the 4DW91-29D remains dedicated to 1500 rpm operation.
| Parameter | Value |
| Engine Mode | FAW 4DW91 29D |
| Number of Cylinders | 4 |
| Cylinder Arrangement | Vertical in-line |
| Cycle | Four stroke |
| Aspiration | Naturally aspirated |
| Bore × Stroke | 90 × 100 mm |
| Displacement | 2.54 L |
| Compression Ratio | 17:01 |
| Prime Power / Speed | 21 kW / 1500 rpm |
| Standby Power / Speed | 23 kW / 1500 rpm |
| Fuel Consumption | 240 g/kWh |
| Oil Consumption | 0.05 L/h |
| Parameter | Value |
| Governor Mode | Mechanical |
| Cooling Mode | Water cooled |
| Oil Capacity (incl. filter) | 8 L |
| Dry Weight (base engine) | 220 kg |
| Dry Weight (Gen Pac) | 240 kg |
| Base Dimensions | 750 × 555 × 680 mm |
| Flywheel Shell Interface | SAE4 |
| Exhaust Gas Temperature | 450 °C |
| Exhaust Gas Flow | 4.6 m³/min |
| Fan Power Consumption | 1.6 kW |
| Heat Rejection (Coolant) | 13.7 kW |
| Fuel Consumption (L/h at 100%) | ~6.0 L/h |
The engine is rated at 21 kW prime power and 23 kW standby power at 1500 rpm. When coupled with an appropriate alternator at 0.8 power factor, this supports 20kVA continuous and 25kVA standby generator sets.
The 4DW91-29D is optimised for 1500 rpm / 50Hz operation. For 1800 rpm / 60Hz applications, FAWDE recommends the 4DW91-38D (28 kW prime) or 4DW92-35D (26 kW prime) models.
Approximately 6.0 liters per hour at 100% load in 50Hz configuration, or 240 g/kWh in specific fuel consumption terms.
Yes. The 4DW series engines are also used in fire pump drives, refrigeration units, and agricultural machinery. However, generator set configurations include specific governor settings, radiator sizing, and coupling arrangements optimised for constant-speed operation.
The SAE4 flywheel housing and standard coupling interface accept alternators from Stamford, Leroy-Somer, Faraday, Werna, Mecc Alte, and most other major manufacturers producing brushless, self-excited machines in the 20–30kVA range.
Yes. We stock parts for the full 4DW series (4DW81-23D, 4DW91-29D, 4DW91-38D, 4DW92-35D, 4DW92-39D, 4DW93-42D, 4DW93-50D) as well as 4DX, CA4D, and CA6D engine families. Please contact us with your parts list for a consolidated quotation.
Genuine FAWDE parts carry the manufacturer’s part number stamped or printed on the component or packaging. We provide part number verification and can supply original packaging with FAW Jiefang Automotive Co., Ltd. Wuxi Diesel Engine Works identification.
As an FAWDE Engine Parts supplier, we maintain comprehensive inventory for the 4DW91-29D and related 4DW series engines. Below is a selection of genuine parts available for immediate export:
We offer flexible shipping options including sea freight for cost-effective bulk orders and air freight for urgent deliveries. Every shipment is fully insured and trackable. Our logistics coordinators monitor each consignment from departure to arrival, providing regular status updates. Upon request, we can also arrange door-to-door delivery service including customs clearance assistance. We understand that timely delivery of your FAW second hand parts is critical for keeping your fleet operational, and we spare no effort in ensuring a seamless shipping experience.
Whether you need a single FAWDE 4dw91 29d engine for a prototype genset, a container of spare FAWDE Engine Parts for your distribution business, or technical guidance on matching the 4DW91-29D with an alternator and control panel, our export team is ready to assist.
Send us your requirements — engine model, quantity, destination port, and any specific configuration needs — and we will respond within 24 hours with pricing, lead time, and shipping options. With deep inventory coverage across the FAWDE 4DW81 23d Engine, 4DW91-29D, and larger FAWDE Diesel Engine platforms, we are positioned to support generator set manufacturers, spare parts distributors, and fleet maintenance operations across Africa, Southeast Asia, the Middle East, and Latin America.
Request a quotation today and experience the combination of genuine FAWDE quality, competitive export pricing, and responsive service that has made us a trusted partner for diesel engine and parts supply worldwide.
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