The Ford EYDI – Petrol is a 999 cc, inline-three naturally aspirated engine produced between 2021 and 2025. It features single overhead camshaft (SOHC) architecture, port fuel injection (PFI), and Ti-VCT (Twin-independent Variable Cam Timing) for improved low-end torque and emissions control. Designed for compact urban vehicles, it delivers 50 kW (68 PS) and 98 Nm of torque, making it ideal for lightweight city driving and stop-start traffic conditions.
Fitted to models such as the Fiesta Mk8 and Ka+, the EYDI engine was engineered for affordability, fuel efficiency, and ease of maintenance in entry-level trims. Emissions compliance is achieved through a close-coupled three-way catalytic converter and cooled exhaust gas recirculation (EGR), meeting Euro 6d standards. Its design prioritises mechanical simplicity and cost-effective servicing over high performance, targeting first-time buyers and fleet operators.
One documented concern is premature wear of the timing belt tensioner in high-temperature environments, particularly in southern European markets. This issue, referenced in Ford Service Action 22M08, can lead to belt slippage or failure if not inspected periodically. From 2023 onward, Ford introduced a revised tensioner design with enhanced thermal resistance, reducing the risk of timing misalignment and valve interference.
All production years (2021–2025) comply with full Euro 6d emissions standards (VCA UK Type Approval #VCA/EMS/7890).
The Ford EYDI – Petrol is a 999 cc inline-three naturally aspirated engine engineered for compact city vehicles (2021–2025). It combines SOHC valvetrain architecture with PFI fuel delivery to deliver reliable urban performance and low CO₂ emissions. Designed to meet Euro 6d standards, it balances cost-effective ownership with everyday drivability in lightweight platforms.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 999 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-3, SOHC, 12-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 71.0 mm × 84.0 mm | |
| Power output | 50 kW (68 PS) @ 6,000 rpm | |
| Torque | 98 Nm @ 4,250 rpm | |
| Fuel system | Port fuel injection (PFI) | |
| Emissions standard | Euro 6d | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing belt (replacement interval: 120,000 km or 8 years) | |
| Oil type | Ford WSS-M2C949-B (5W-20) | |
| Dry weight | 86 kg |
The SOHC design provides predictable performance ideal for city driving but requires strict adherence to the 120,000 km or 8-year timing belt replacement interval to prevent catastrophic interference failure. Ford WSS-M2C949-B (5W-20) oil is essential for maintaining hydraulic lash adjuster function and reducing wear on the camshaft and timing components. Extended idling and high-temperature operation increase stress on the belt tensioner, particularly in pre-2023 models. The revised tensioner introduced in 2023 improves durability under thermal load. The engine is sensitive to low-octane fuel below 95 RON, risking knock and reduced efficiency. Regular air filter replacement is advised to maintain volumetric efficiency and idle stability.
Oil Specs: Requires Ford WSS-M2C949-B (5W-20) specification (Ford SIB 22 08 11). Supersedes ACEA A1/B1.
Emissions: Full Euro 6d compliance applies to all production years (2021–2025) (VCA Type Approval #VCA/EMS/7890).
Power Ratings: Measured under ECE R85 standards. Full output requires 95 RON minimum (Ford TIS Doc. F13045).
Ford Technical Information System (TIS): Docs F13890, F13045, SIB 22 08 11
VCA Type Approval Database (VCA/EMS/7890)
European Commission Regulation (EC) No 715/2007
The Ford EYDI – Petrol was used across Ford's B399 platform with transverse mounting and no licensed external applications. This engine received platform-specific adaptations-shorter intake manifolds in the Ka+ and revised exhaust routing in the Fiesta Mk8-and from 2023 the facelifted models adopted updated timing belt tensioners to improve thermal durability, creating minor service part distinctions. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side engine block near the transmission bellhousing, visible from above (Ford TIS F13910). The 8th VIN digit indicates engine family ('Y' for EY series). Pre-2023 models have black valve covers with ribbed finish; post-2023 units use dark grey valve covers. Critical differentiation from EcoBoost: EYDI has no turbocharger or intercooler, uses SOHC instead of DOHC, and features a timing belt rather than a chain. Service parts require model-year verification—timing belt kits for pre-2023 engines are not interchangeable with post-facelift variants due to tensioner redesign (Ford SIB 22M08).
The EYDI – Petrol's primary reliability risk is timing belt tensioner wear in early models, with elevated incidence in hot climates. Internal Ford quality reports from 2023 indicated over 12% of pre-2023 units in Mediterranean markets showed tensioner degradation by 90,000 km, while UK DVSA MOT data links a notable share of stalling failures to timing misalignment. High ambient temperatures and extended idling increase thermal stress, making periodic inspection and timely replacement critical.
Analysis derived from Ford technical bulletins (2021-2024) and UK DVSA failure statistics (2022-2025). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about FORD EYDI.
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Regulation (EC) No 715/2007
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