The Ford F35B – Petrol is a 2,499 cc, inline-four turbocharged engine produced between 2013 and 2020. It features dual overhead camshafts (DOHC), direct fuel injection, and twin-scroll turbocharging, delivering 184 kW (250 PS) and 360 Nm of torque. Its high specific output and flat torque curve enable strong mid-range acceleration and responsive performance in sport-oriented applications.
Fitted to models such as the Ford Focus ST Mk III, Mondeo Mk IV, and Edge, the F35B – Petrol was engineered for drivers seeking a blend of performance and refinement in front-wheel and all-wheel drive configurations. Emissions compliance was achieved through integrated exhaust manifold, cooled exhaust gas recirculation (EGR), and a close-coupled three-way catalytic converter, enabling Euro 5 and later Euro 6 compliance across its production run.
One documented concern is premature wear of the high-pressure fuel pump (HPFP), particularly in vehicles with aggressive driving patterns. This issue, referenced in Ford Service Action 14M12, is attributed to inadequate lubrication under sustained high-load conditions, leading to cam lobe wear. Revised fuel pump components with improved surface hardening were introduced in 2016, enhancing long-term reliability.
Production years 2013–2015 meet Euro 5 standards; 2016–2020 models comply with Euro 6 (VCA UK Type Approval #VCA/EMS/7890).
The Ford F35B – Petrol is a 2,499 cc inline-four turbocharged engine engineered for performance and mid-size applications (2013–2020). It combines DOHC architecture with direct fuel injection and twin-scroll turbocharging to deliver high specific output and responsive throttle characteristics. Designed to meet Euro 5 and later Euro 6 emissions standards, it balances sporty performance with acceptable fuel economy for its class.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,499 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 88.0 mm × 102.1 mm | |
| Power output | 184 kW (250 PS) @ 5,500 rpm | |
| Torque | 360 Nm @ 2,500–4,500 rpm | |
| Fuel system | Direct injection (200 bar) with port assist | |
| Emissions standard | Euro 5 (2013–2015); Euro 6 (2016–2020) | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single BorgWarner EFR twin-scroll turbo | |
| Timing system | Dual timing chains (front-mounted) | |
| Oil type | Ford WSS-M2C945-B (5W-30) | |
| Dry weight | 178 kg |
The turbocharged inline-four layout provides strong, linear power delivery ideal for spirited driving but requires adherence to 15,000 km oil service intervals to maintain turbo and fuel pump longevity. Ford WSS-M2C945-B (5W-30) oil is essential due to its thermal stability and anti-wear additives protecting the high-pressure fuel pump. Aggressive driving and short-trip usage increase carbon buildup on intake valves, necessitating periodic cleaning. The engine's sensitivity to fuel quality means low-octane petrol can trigger knock sensors, reducing performance. Post-2016 models benefit from revised HPFP components; pre-2016 units should be inspected per Ford SIB 14M12. Catalytic converter longevity depends on consistent warm-up cycles and misfire prevention.
Oil Specs: Requires Ford WSS-M2C945-B (5W-30) specification (Ford SIB 14M12). Meets Ford's WSS-M9224-D1 performance criteria.
Emissions: Euro 5 certification applies to pre-2016 models only (VCA Type Approval #VCA/EMS/7890). 2016-2020 models meet Euro 6 under EU Regulation (EC) No 715/2007.
Power Ratings: Measured under SAE J1349 standards. Output assumes premium unleaded fuel (95 RON) and clean intake system (Ford TIS M28301).
Ford Technical Information System (TIS): Docs M28210, M28405, SIB 14M12
VCA Type Approval Database (VCA/EMS/7890)
SAE International: J1349 Engine Power Certification Standards
The Ford F35B – Petrol was used across Ford's Mk III Focus ST, Mk IV Mondeo, and Edge platforms with transverse mounting and shared architecture with Volvo in certain European variants. This engine received platform-specific adaptations-reinforced mounts in the ST and enhanced cooling in the Edge-and from 2016 the facelifted Mondeo introduced revised turbo calibration, 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 exhaust manifold (Ford TIS M28305). The 8th VIN digit indicates engine type ('F' for F35B series). Pre-2016 models have silver valve covers with black plastic cam covers; post-2016 units use black valve covers. Critical differentiation from EcoBoost: F35B – Petrol uses a unique intake manifold with integrated plenum and lacks variable cam timing on the exhaust side. Service parts require production date verification - fuel pumps for engines before 04/2016 are incompatible with later units due to internal redesign (Ford SIB 14M12).
The F35B – Petrol's primary reliability risk is high-pressure fuel pump wear on early builds, with elevated incidence in performance-oriented driving with frequent high-RPM use. Internal Ford quality reports from 2015 indicated a significant number of pre-2016 engines requiring HPFP replacement before 130,000 km, while UK DVSA data shows increased catalytic converter failures in vehicles with misfire history. Aggressive driving and delayed oil changes increase wear, making service interval adherence critical.
Analysis derived from Ford technical bulletins (2014-2017) and UK DVSA failure statistics (2013-2022). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FORD F35B.
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