The Ford G8DB is a 2,261 cc, inline‑four turbocharged petrol engine produced between 2021 and 2023. It belongs to Ford's EcoBoost engine family and features direct fuel injection, dual overhead camshafts (DOHC), and an integrated exhaust manifold. In standard tune, it produces 239 kW (325 PS) and 440 Nm of torque, delivering high — performance characteristics for sport — oriented applications.
Fitted exclusively to the Focus ST (Mk4), the G8DB was engineered for aggres…
All G8DB engines comply with full Euro 6d (WLTP/RDE) standards .
The Ford G8DB is a 2,261 cc inline‑four turbocharged petrol engine designed for high-performance applications (2021–2023). It combines direct injection with a twin-scroll turbocharger and advanced thermal management to deliver strong mid-range torque and rapid throttle response. Designed to meet Euro 6d emissions standards, it balances track-ready performance with road legality.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,261 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged | |
Bore × stroke | 87.5 mm × 94.0 mm | |
Power output | 239 kW (325 PS) @ 5,500 rpm | |
Torque | 440 Nm @ 3,000–4,000 rpm | |
Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
Emissions standard | Euro 6d (WLTP/RDE) | |
Compression ratio | 9.5:1 | |
Cooling system | Water-cooled with dual-circuit thermal management | |
Turbocharger | Single twin-scroll turbo (Honeywell GT1549VZ) | |
Timing system | Chain-driven (front-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 138 kg |
The Ford G8DB was used exclusively in the Ford's C2 platform with transverse mounting and performance-specific calibration. This engine received platform-specific adaptations-enhanced cooling, revised torque mounts, and performance-tuned ECU maps in the Focus ST-and from 2022 the facelifted Focus ST Mk4 adopted the G8DB with upgraded intercooler and revised HPFP, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The G8DB is generally reliable when maintained properly, but pre-2022 models have a known issue with high-pressure fuel pump wear under sustained high-load use. Later revisions (2022+) feature improved pump coatings and ECU tuning. Regular oil changes using Ford WSS-M2C949-B (5W-30) and avoiding prolonged high-RPM operation significantly improve long-term durability.
The most common issues are high-pressure fuel pump failure, GPF clogging due to urban driving, intercooler piping detachment, and timing chain tensioner wear. These are documented in Ford service bulletins and field reports. Thermal stress and fuel quality are key contributing factors.
The G8DB engine is used exclusively in the Ford Focus ST (Mk4, 2021–2023) in the 2.3L EcoBoost 325 PS configuration. It is not used in any other Ford model or outside the C2 platform and is specific to the ST performance variant.
Aftermarket ECU tuning is common on the G8DB platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In real-world mixed driving, the G8DB achieves approximately 9.5–11.5 L/100km (24–30 mpg UK). On the highway, it can reach ~8.0 L/100km (35 mpg UK), while aggressive driving may exceed 13.5 L/100km (21 mpg UK). Fuel economy is highly dependent on driving style due to the engine's performance orientation.
Yes, the G8DB is an interference engine. If the timing chain fails or jumps, piston-to-valve contact is likely, resulting in severe internal engine damage. Maintaining proper oil levels and adhering to service intervals is critical to prevent tensioner failure and chain stretch, especially under performance use.
Ford specifies WSS-M2C949-B (5W-30) synthetic oil for the G8DB engine. This high-performance, low-SAPS formulation is essential for protecting the turbocharger, HPFP, and particulate filter. Oil should be changed every 15,000 km or annually, whichever comes first, to ensure optimal component longevity.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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