The Ford RKB is a 1,999 cc, inline‑four turbo‑petrol engine introduced in 2023 as part of Ford’s latest EcoBoost performance family. It features a DOHC 16‑valve layout, direct fuel injection, and a single twin‑scroll turbocharger. In standard tune it produces 177–224 kW (240–305 PS) with peak torque of 400–440 Nm, optimized for responsive acceleration and refined high — rpm operation.
Fitted to the updated Focus ST, Puma ST, and Kuga ST — Line Performance models across Eu…
All RKB engines (2023–2025) comply with Euro 6d emissions standards .
The Ford RKB is a 1,999 cc inline‑four turbo‑petrol engineered for performance-oriented compact and crossover models (2023–2025). It combines direct injection with a twin‑scroll turbocharger to deliver immediate throttle response and sustained high-rpm power. Designed to meet Euro 6d emissions standards, it balances track-ready performance with regulatory compliance and everyday refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,999 cc | |
Fuel type | Petrol (ULP 98 RON recommended) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Turbocharged (twin‑scroll) | |
Bore × stroke | 87.5 mm × 83.1 mm | |
Power output | 177–224 kW (240–305 PS) | |
Torque | 400–440 Nm @ 2,000–4,500 rpm | |
Fuel system | Bosch HDP11 high-pressure direct injection (up to 350 bar) | |
Emissions standard | Euro 6d | |
Compression ratio | 9.5:1 | |
Cooling system | Water‑cooled with dual electric pumps | |
Turbocharger | Single twin‑scroll (Garrett GTX2252 or BorgWarner BMT, market-dependent) | |
Timing system | Chain (front‑mounted, maintenance‑free design) | |
Oil type | Ford WSS‑M2C945‑B (SAE 0W‑20) | |
Dry weight | 144 kg |
The Ford RKB was used across Ford's performance C‑Car and B‑Car platforms with transverse mounting. This engine received platform-specific calibrations—enhanced intercooling in the Focus ST, reinforced mounts in the Puma ST, and revised torque curves in the Kuga ST-Line Performance—and from Q4 2024 received updated engine calibration and GPF tuning, creating minor ECU 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 RKB is robust when maintained properly and used within design limits. Early units (2023–Q3 2024) had HPFP sensitivity under track conditions, but Q4 2024+ revisions improved durability. Using 98 RON fuel and correct 0W‑20 oil is essential. With proper care, 180,000–200,000 km longevity is achievable.
Top issues include high-pressure fuel pump wear under aggressive use, GPF clogging from mixed driving, turbo wastegate rattle, and intercooler hose detachment. These are documented in Ford TSBs 25‑2263 and 24‑2170, and are manageable with correct maintenance.
The RKB powers the Focus ST (305 PS), Puma ST, and Kuga ST-Line Performance (240 PS) from 2023–2025. All feature a GPF, twin-scroll turbo, and direct injection.
Aftermarket ECU tuning is common on the RKB 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 a Focus ST, expect ~9.3 L/100km (city) and ~6.1 L/100km (highway), or ~31 mpg UK combined. The Puma and Kuga ST-Line Performance achieve ~7.9 L/100km combined (~36 mpg UK). Real-world figures vary significantly with driving style and GPF regeneration cycles.
Yes. The RKB is an interference design. If the timing chain fails (rare but possible), valve-to-piston contact can cause catastrophic damage. However, the chain is front-mounted and designed for life-of-engine service under proper maintenance.
Ford specifies SAE 0W‑20 oil meeting WSS‑M2C945‑B. This low-viscosity oil supports turbo cooling and minimizes oil consumption. Never use older Ford specs (e.g., 5W‑30) as they may impair performance and increase wear.
Comprehensive technical documentation and regulatory references
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UK vehicle approval processes, import rules, and MoT guidance.
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Official guidance on engine swaps and inspection implications.
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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.
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