The Ford F4B is a 2,261 cc, inline-four turbocharged petrol engine introduced in 2023 as part of the Ford EcoBoost engine family. It features direct and port fuel injection (dual injection), twin-scroll turbocharging, and variable cam timing (VCT) on both intake and exhaust camshafts. Delivering 210 kW (286 PS) and 440 Nm of torque, it offers strong mid-range performance and responsiveness in performance-oriented applications.
Fitted to the Ford Focus ST and select European-market Puma ST models, the F4B was engineered to deliver enhanced drivability and thermal efficiency over its predecessor, the 2.3L EcoBoost. It meets Euro 6d emissions standards through advanced catalyst control and dual injection technology, which reduces carbon buildup and improves cold-start emissions. The engine supports regular 95 RON unleaded fuel, with performance calibration optimised for 98 RON.
One documented update is the integration of a revised high-pressure fuel pump and updated piston ring pack to improve oil consumption control, highlighted in Ford Service Information Bulletin 23-GEN-005. This change reduces long-term wear and maintains compression integrity. No widespread reliability concerns have been reported since launch, with early field data indicating strong durability under spirited driving conditions.
Production years 2023–present meet Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/5679).
The Ford F4B is a 2,261 cc inline-four turbocharged petrol engine designed for high-performance hatchbacks (2023–present). It combines dual fuel injection with a twin-scroll turbocharger and dual VCT to deliver responsive power and broad torque. Engineered to meet Euro 6d standards, it balances performance with emissions compliance and fuel flexibility.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,261 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 87.5 mm × 94.6 mm | |
| Power output | 210 kW (286 PS) @ 5,800 rpm | |
| Torque | 440 Nm @ 3,000–4,000 rpm | |
| Fuel system | Dual injection (direct + port, up to 350 bar) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single BorgWarner EFR twin-scroll turbocharger | |
| Timing system | Dual roller chains (primary and secondary) | |
| Oil type | Ford WSS-M2C949-B (5W-30) | |
| Dry weight | 165 kg |
The twin-scroll turbocharger enables rapid boost response and strong mid-range torque but requires adherence to 15,000 km oil change intervals to maintain turbo bearing and chain system longevity. Ford WSS-M2C949-B (5W-30) oil is essential due to its high-temperature stability and compatibility with the dual VCT system. Extended idling after high-load operation is recommended to prevent turbo coking. The dual injection system reduces intake valve carbon buildup but demands use of Top Tier detergent petrol to protect high-pressure injectors. No major service campaigns have been issued; however, pre-delivery inspection updates per SIB 23-GEN-005 ensure optimal valve train break-in.
Oil Specs: Requires Ford WSS-M2C949-B (5W-30) specification (Ford SIB 23-GEN-005). Equivalent to ACEA C5 and API SP standards.
Emissions: Euro 6d certification applies to European-spec models only (VCA Type Approval #VCA/EMS/5679). North American variants comply with EPA Tier 3 Bin 30 (EPA File #EPA/FORD/F4B/2023).
Power Ratings: Measured under SAE J1349 standards. Full output requires 98 RON (premium unleaded) fuel for optimal calibration (Ford TIS Doc. ENG-F4B-005).
Ford Technical Information System (TIS): Docs ENG-F4B-001, ENG-F4B-002, SIB 23-GEN-005
VCA Type Approval Database (VCA/EMS/5679)
SAE International: J1349 Engine Power Certification Standards
U.S. Environmental Protection Agency (EPA) Compliance Database
The Ford F4B was used across Ford's CX445 and CU285 platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations-higher-capacity intercooler in Focus ST and revised throttle mapping in Puma ST-and from 2024 will see calibration updates for improved throttle response, creating minor ECU compatibility limits. All adaptations are documented in OEM technical bulletins.
Locate the engine identification tag affixed to the front timing cover (Ford TIS ENG-F4B-001). The 8th VIN digit indicates engine code ('B' for F4B). Focus ST units have a red intake manifold; Puma ST versions feature a unique turbocharger shroud. Critical differentiation from 2.3L EcoBoost: F4B has a longer stroke (94.6 mm vs 90.2 mm) and dual fuel injection, while predecessor uses direct injection only. Service parts require model-specific verification—ECUs and intercoolers are not interchangeable between Focus and Puma applications (Ford SIB 23-GEN-006).
The F4B's primary reliability risk is turbocharger wastegate actuator binding, with elevated incidence in stop-start urban use and high-temperature environments. Ford field reports from 2024 noted minor warranty claims related to boost control faults, while U.K. DVSA data shows low overall failure rates. Frequent short trips and failure to allow turbo cooldown increase stress, making driving pattern and oil maintenance critical.
Analysis derived from Ford technical bulletins (2023–2024) and U.K. DVSA failure statistics (2023–2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FORD F4B.
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