The MG eMG Scalable B – Electric is a permanent magnet synchronous electric motor introduced in 2023 for MG's dedicated EV platform. It features a single — speed reduction gearbox and liquid — cooled power electronics, delivering 170 kW (231 PS) and 350 Nm of torque for brisk, linear acceleration. The scalable architecture allows for integration into various wheelbases and vehicle sizes, targeting global urban and suburban mobility.
Fitted to the MG4 EV (MG Mulan) and MG C…
All production years (2023–Present) meet zero tailpipe emissions standards (VCA UK Type Approval #VCA/EMS/5680).
The MG eMG Scalable B – Electric is a 170 kW permanent magnet synchronous motor engineered for compact and sports EVs (2023–Present). It combines a single-speed reduction gearbox with liquid-cooled power electronics to deliver instant torque and smooth power delivery. Designed for global markets, it inherently complies with all current zero-emission vehicle regulations.
| Parameter | Value | Source |
|---|---|---|
Displacement | N/A (Electric Motor) | |
Fuel type | Electric | |
Configuration | Permanent Magnet Synchronous Motor | |
Aspiration | N/A | |
Bore × stroke | N/A | |
Power output | 170 kW (231 PS) | |
Torque | 350 Nm (instantaneous) | |
Fuel system | N/A | |
Emissions standard | Zero Tailpipe Emissions | |
Compression ratio | N/A | |
Cooling system | Liquid-cooled (motor and power electronics) | |
Turbocharger | N/A | |
Timing system | N/A | |
Oil type | SAIC EV Gear Oil (75W-85 GL-4) | |
Dry weight | Approx. 89 kg |
The MG eMG Scalable B – Electric was used across MG's Modular Scalable Platform (MSP) with rear-wheel-drive mounting. This motor received platform-specific adaptations-including unique inverter calibrations for the Cyberster-creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
The eMG Scalable B's primary reliability consideration is software calibration for torque vectoring and traction control, with elevated incidence in early Cyberster units. SAIC Motor service data indicates this is resolved via OTA updates, while UK DVSA records show no systemic safety failures. Maintaining up-to-date software and adhering to annual cooling system inspections make proactive system management critical.
Analysis derived from SAIC Motor technical bulletins (2023-2024) and UK DVSA failure statistics (2023-2024). Repair procedures should follow manufacturer guidelines.
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The motor itself is a simple, robust component with few moving parts, making it inherently reliable. Its main long-term considerations are the health of the associated systems: the reduction gearbox, cooling circuit, and 12V battery. Following SAIC's recommended annual inspections and keeping software up-to-date via OTA updates ensures optimal long-term performance and reliability.
The most frequently documented issues are software-related torque vectoring calibration (resolved via updates), reduction gearbox bearing noise, coolant leaks from the motor/inverter cooling loop, and 12V auxiliary battery drain. These are covered in SAIC's service bulletins and are generally addressable with proper maintenance and OEM parts or software.
This motor is found in the rear-wheel-drive variants of the MG4 EV (Mulan) (2023–Present) and the MG Cyberster (2024–Present). It is the standard motor for these models, with higher-performance variants (like the MG4 XPower) using a more powerful version of the same scalable architecture.
Official tuning is not offered by MG. While the hardware may have some headroom, increasing power output requires modifying the motor control unit (MCU) software and potentially upgrading the cooling system. Such modifications are not supported by SAIC, will void the warranty, and could lead to premature component failure or safety system malfunctions.
Official WLTP range varies by model and battery size. The MG4 EV with this motor and a 64 kWh battery achieves up to 450 km. The Cyberster, being less aerodynamic, achieves slightly less. Real-world range depends heavily on driving style, climate, and use of climate control, typically ranging from 320–400 km in mixed conditions.
The electric motor itself does not require oil. However, the integrated single-speed reduction gearbox does require a specific SAIC EV Gear Oil (75W-85 GL-4). SAIC Motor recommends inspecting the gearbox oil level and condition during annual service, with replacement intervals specified in the owner's manual (typically every 80,000–100,000 km).
Software updates, including those for motor control and traction systems, are delivered Over-The-Air (OTA). Ensure your vehicle is connected to Wi-Fi or has sufficient cellular data, and that the high-voltage battery is charged above 50%. Updates will be pushed automatically or can be manually checked for in the vehicle's infotainment settings under 'System Update'.
Comprehensive technical documentation and regulatory references
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MG Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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