Weichai
Weichai 20M55D4550E311
Weichai 20M55D4550E311. Source: 发动机数据单-20M55-6005_20M55D4550E311_NonRad无散热器_Datasheet_26-03-04.pdf, p.1. Gross engine mechanical PRP 4140 kW / ESP 4550 kW at 1800 rpm. Net power is configuration-dependent and separate from gross mechanical output; no electrical genset output inferred. ESP applications only: all printed PRP figures are reference only and not supported prime-duty ratings. Emissions statement as printed: Unregulated; no additional certification inferred. Production status is unknown; discontinued is the user-authorized catalogue classification, not manufacturer-confirmed cessation. No production-end year asserted. Physical specifications added from manufacturer datasheets, 2026-10-21: compression ratio 16.5:1; dry engine weight 14500 kg without radiator and radiator pipes; overall dimensions without radiator (L × W × H) 4613 × 1560 × 2800 mm. Sources: 发动机数据单-20M55-6005_20M55D4550E311_NonRad无散热器_Datasheet_26-03-04.pdf (physical data on pp.1–2). Existing populated specification fields were not overwritten. Weight is dry engine weight, not genset shipping weight.
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General WhatsApp chatScan with your phone. Add the model and your request in chat.Haifeng sales team- Supporting documents
- 1 document · 1 datasheet
- Last updated
- 2026-10-21
- Package route
- diesel generator sets
- Mechanical Output
- 4,550 kW
- Cylinders
- V20
- Displacement
- 109.4 L
- Rated Speed
- 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Standby Power | 4550 | — | — |
Estimated rating: 4095 kWe (4550 kW × 0.90) · 60 Hz · standby
Planning estimate, not a manufacturer generator rating. Confirm the alternator, engine speed and operating conditions.
Weichai 20M55D4550E311 overhaul & repair parts
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Weichai 20M55D4550E311 generator set context
The Weichai 20M55D4550E311 is listed here as a diesel generator-drive engine for 60 Hz generator sets, with a headline 4,550 kW / standby rating. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
Model name formats
Technical Specifications
| Brand | Weichai |
| Model | 20M55D4550E311 |
| Configuration | V20 |
| Cylinders | 20 |
| Displacement | 109.4 L |
| Compression Ratio | 16.5:1 |
| Dry Weight | 14500 kg |
| Dimensions (L×W×H) | 4613 × 1560 × 2800 mm |
| Fuel Type | Diesel |
| Ignition Type | Compression Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | Unregulated |
Frequently asked questions
Does the 20M55D4550E311 run at 50 Hz or 60 Hz?
The Weichai 20M55D4550E311 is rated for 60 Hz (1,800 rpm).
What fuel does the Weichai 20M55D4550E311 use?
The Weichai 20M55D4550E311 is a diesel generator-set engine.
What is the displacement and cylinder configuration of the 20M55D4550E311?
The Weichai 20M55D4550E311 is a V20 (20-cylinder) engine with a displacement of 109.4 L.
Is the 20M55D4550E311 still in production?
No — the Weichai 20M55D4550E311 is discontinued. Its specifications and datasheets remain archived here for reference.
Are reference documents available for the 20M55D4550E311?
This page links reference documents for the Weichai 20M55D4550E311. Check each document's title, model coverage, revision and rating conditions before using it for selection.