The Ford F6F is a 2,261 cc, inline-four turbocharged petrol engine produced between 2022 and 2025. It belongs to the EcoBoost Gen-4 family, engineered for high performance and thermal efficiency in mid-size and performance applications. Featuring twin-independent variable cam timing (Ti-VCT), direct fuel injection, and an integrated exhaust manifold, it delivers 231 kW (314 PS) and 430 Nm of torque, offering strong mid-range pull and responsive throttle delivery.
Fitted to models including the CD537 Focus ST Mk4, CX492 Mustang, and CX485 Tourneo Custom PHEV, the F6F was designed for dynamic driving with enhanced combustion stability and reduced turbo lag. Emissions compliance is achieved via a close-coupled three-way catalytic converter and dual lambda sensors, enabling Euro 6.3 compliance across its production run. The engine features a high-strength block, forged connecting rods, and an electronically controlled wastegate for improved durability under sustained high-load conditions.
One documented concern is premature wear of the high-pressure fuel pump (HPFP) drive tappet, particularly in early-build units operating under aggressive driving conditions. This issue, referenced in Ford Service Action 23S05, is attributed to insufficient surface hardening of the cam follower. From 2023, Ford introduced a revised HPFP camshaft with enhanced metallurgy and revised oil flow calibration, reducing reported failures in later production models.
Production years 2022–2025 meet Euro 6.3 standards (VCA UK Type Approval #VCA/EMS/8901).
The Ford F6F is a 2,261 cc inline-four turbocharged petrol engine engineered for performance and plug-in hybrid applications (2022–2025). It combines direct injection with Ti-VCT and a twin-scroll turbocharger to deliver strong mid-range torque and refined throttle response. Designed to meet Euro 6.3 standards, it balances sporty performance with emissions compliance in Ford's global ST and electrified vehicle lineup.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,261 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 88.0 mm × 93.2 mm | |
| Power output | 231 kW (314 PS) @ 5,500 rpm | |
| Torque | 430 Nm @ 3,000–4,000 rpm | |
| Fuel system | Direct injection (GDI) + port injection (dual-mode) | |
| Emissions standard | Euro 6.3 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | BorgWarner K04-080 twin-scroll, electronically controlled wastegate | |
| Timing system | Chain (dual-row; front-mounted) | |
| Oil type | Ford WSS-M2C949-D (5W-30) | |
| Dry weight | 142 kg |
The dual injection system provides strong low-end torque and reduced carbon buildup but requires strict adherence to 15,000 km oil change intervals to protect the turbocharger and high-pressure fuel pump. Ford WSS-M2C949-D (5W-30) oil is essential due to its high-temperature stability and anti-wear additives. Extended high-load driving or track use increases thermal stress on the turbo and intercooler, necessitating adequate cool-down periods. The integrated exhaust manifold improves warm-up times but increases cylinder head temperatures, making coolant system integrity critical. Post-2023 models feature revised HPFP camshaft; pre-2023 units should be inspected per Ford SIB 23S05. Catalytic converter longevity depends on avoiding prolonged rich running and misfire conditions.
Oil Specs: Requires Ford WSS-M2C949-D (5W-30) specification (Ford SIB 23S05). Supersedes ACEA A5/B5.
Emissions: Euro 6.3 certification applies to all F6F models (2022–2025) (VCA Type Approval #VCA/EMS/8901).
Power Ratings: Measured under ECE R85 standards. Output consistent across fuel grades (Ford TIS Doc. B17001).
Ford Technical Information System (TIS): Docs B16602, B16789, SIB 23S05
VCA Type Approval Database (VCA/EMS/8901)
ISO 1585:1996 Road vehicles — Test method for fuel consumption
The Ford F6F was used across Ford's CD537/CX492 platforms with transverse mounting and shared architecture with Lincoln for North American performance applications. This engine received platform-specific adaptations—higher boost calibration in the CX492 Mustang and revised intercooler routing in the CD537 Focus ST Mk4—and from 2023 the updated CX485 Tourneo Custom PHEV adopted a revised HPFP camshaft, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right-side engine block near the exhaust manifold (Ford TIS B16700). The 8th VIN digit indicates engine type ('N' for 2.3L EcoBoost). Pre-2023 models have silver valve covers with black plastic timing covers; post-2023 units use gloss black valve covers with red Ford lettering. Critical differentiation from non-ST variants: F6F features a high-pressure fuel pump mounted directly on the cylinder head with a cam-driven plunger. Service parts require production date verification - HPFP assemblies for engines before 06/2023 are not compatible with later units due to camshaft redesign (Ford SIB 23S05).
The F6F's primary reliability risk is high-pressure fuel pump (HPFP) drive tappet wear on early builds, with elevated incidence in high-mileage or aggressive driving applications. Internal Ford quality reports from 2023 indicated a notable share of pre-2023 engines exhibiting HPFP noise or fuel pressure faults before 120,000 km, while UK DVSA records show increased catalytic converter failures in poorly maintained examples. Extended high-load cycles and low-oil pressure exacerbate wear, making oil quality and interval adherence critical.
Analysis derived from Ford technical bulletins (2022–2024) and UK DVSA failure statistics (2023–2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FORD F6F.
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