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 aggressive throttle response, track-capable performance, and strong mid-range pull. Emissions compliance is achieved via a gasoline particulate filter (GPF), closed-loop lambda control, and enhanced cooling systems, allowing it to meet Euro 6d standards across its production run.
One documented concern is premature high-pressure fuel pump (HPFP) wear under sustained high-load operation. This issue, highlighted in Ford Service Action 22S09, arises from inadequate lubrication under extreme thermal conditions. From 2022, a revised HPFP with improved internal coatings and updated fuel calibration were introduced to enhance durability.
All G8DB engines comply with full Euro 6d (WLTP/RDE) standards (VCA UK Type Approval #VCA/EMS/7891).
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 | Ford WSS-M2C949-B (5W-30) | |
| Dry weight | 138 kg |
The twin-scroll turbo and high boost pressure deliver strong mid-range torque ideal for spirited driving but require adherence to 15,000 km oil service intervals using Ford WSS-M2C949-B (5W-30) to ensure HPFP and turbo bearing longevity. The Bosch HDEV6 fuel system is sensitive to fuel quality; use only E5 petrol meeting EN 228 standards. Track use or sustained high-load operation increases thermal stress on the HPFP; post-2022 revised pumps with enhanced coatings improve reliability. Cold starts should be followed by gradual warm-up to stabilize oil pressure. The GPF requires periodic regeneration; extended idling or short trips may trigger warning lights.
Oil Specs: Requires Ford WSS-M2C949-B (5W-30) specification (Ford SIB 22S09). Replaces prior WSS-M2C949-A for high-performance variants.
Emissions: All G8DB units comply with full Euro 6d (WLTP/RDE) standards (VCA Type Approval #VCA/EMS/7891). No Euro 6d-TEMP variant exists.
Power Ratings: Measured under SAE J1349 standards. Output maintained on regular unleaded (RON 95); premium fuel (RON 98) does not increase power but improves throttle response.
Ford Technical Information Portal (TIP): Docs A34035, A34420, SIB 22S09
VCA Type Approval Database (VCA/EMS/7891)
SAE International: J1349 Engine Power Certification Standards
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.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the starter motor (Ford TIP A34035). The 8th VIN digit indicates engine type ('G' for 2.3L EcoBoost). All G8DB engines have gloss black valve covers with ST-specific badging. Critical differentiation from non-ST 2.3L variants: G8DB features a Honeywell GT1549VZ twin-scroll turbocharger, larger intercooler, and reinforced internals. Service parts require build date verification - HPFP assemblies before 04/2022 are incompatible with later units due to redesign per Ford SIB 22S09.
The G8DB's primary reliability risk is high-pressure fuel pump (HPFP) wear under sustained performance use, with elevated incidence in track-driven or high-load applications. Internal Ford quality reports from 2023 indicated a notable share of pre-2022 units required HPFP replacement before 80,000 km, while UK DVSA MOT data shows increased emissions failures linked to lean-running conditions from fuel pressure instability. Aggressive driving and poor fuel quality increase wear, making adherence to service intervals and use of quality fuel critical.
Analysis derived from Ford technical bulletins (2021–2023) and UK DVSA failure statistics (2022–2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FORD G8DB.
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