The Alfa Romeo 939 A9.000 is a 1,742 cc, inline — four petrol engine produced between 2016 and 2023. It is part of the MultiAir II engine family, featuring variable valve timing and electro — hydraulic valve actuation for enhanced responsiveness and efficiency. Delivering 140–191 kW (190–260 PS) and up to 400 Nm of torque, it provides strong performance ideal for dynamic driving characteristics.
Fitted to models including the Giulia (952) Quadrifoglio and Stelvio (956) Q…
All production years 2016–2023 meet Euro 6c emissions standards (VCA UK Type Approval #VCA/EMS/5679).
The Alfa Romeo 939 A9.000 is a 1,742 cc inline-four petrol engine developed for high-performance variants of the Giulia and Stelvio platforms (2016–2023). It combines MultiAir II variable valve control with twin-scroll turbocharging and race-derived engine management to deliver aggressive throttle response and high specific output. Designed to meet Euro 6c standards, it balances track-ready performance with road usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,742 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve with MultiAir II | |
Aspiration | Twin-turbocharged | |
Bore × stroke | 86.0 mm × 75.0 mm | |
Power output | 140–191 kW (190–260 PS) | |
Torque | 320–400 Nm @ 2,200–4,800 rpm | |
Fuel system | Direct injection with port injection (twin-injection) | |
Emissions standard | Euro 6c | |
Compression ratio | 9.8:1 | |
Cooling system | Water-cooled with dual circuit | |
Turbocharger | Twin IHI ball-bearing turbochargers | |
Timing system | Chain-driven (double-row primary, single-row secondary) | |
Oil type | SAE 0W-40 C3 (Fiat 9.55535-S3) | |
Dry weight | 132 kg |
The Alfa Romeo 939 A9.000 was used exclusively in Alfa Romeo's high-performance 952/956 Quadrifoglio variants with longitudinal mounting. This engine received track-focused tuning—higher boost pressure, revised cam profiles, and enhanced cooling—and from 2019, updated ECU calibration per Technical Bulletin 84/2019, creating model-year-specific service requirements. All adaptations are documented in OEM technical bulletins.
The 939 A9.000's primary reliability risk is turbocharger oil coking under extreme use, with elevated incidence in track-driven vehicles. Internal FCA performance reports from 2021 noted increased turbo failures in pre-2019 models with inadequate cool-down procedures, while UK DVSA records show a low rate of emissions-related faults linked to EGR and catalyst efficiency. Aggressive driving and poor oil maintenance amplify stress, making oil quality and thermal management adherence critical.
Analysis derived from Alfa Romeo technical bulletins (2016–2022) and UK DVSA failure statistics (2018–2023). 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 939 A9.000 offers exceptional performance and high specific output, but track-focused use without proper cool-down increases turbocharger oil coking risk. Later models (post-2019) with updated ECU calibration improved thermal management. Consistent use of correct oil (0W-40 C3, Fiat 9.55535-S3) and adherence to warm-up/cool-down procedures are essential for long-term reliability.
Primary issues include turbocharger oil coking from improper cool-down, intake valve coking from direct injection, and MultiAir actuator degradation due to oil contamination. Secondary concerns involve oil leaks from valve cover gaskets and EGR/catalyst efficiency faults. These are documented in Alfa Romeo service bulletins and technical advisories.
This 2.0L twin-turbo petrol engine is used exclusively in the Giulia Quadrifoglio (952, 2016–2023) and Stelvio Quadrifoglio (956, 2017–2023), producing 260 PS. All models meet Euro 6c emissions standards and feature track-tuned suspension and cooling systems.
Yes. The 939 A9.000 responds well to ECU remapping, with stage 1 tunes typically adding +30–60 kW. Stock internals support moderate increases, but higher power levels require upgraded intercoolers, fuel systems, and engine management. Tuning should preserve OEM safety margins and use premium fuel to avoid knock.
In real-world driving, expect 10.0–13.0 L/100km (22–29 mpg UK) in mixed conditions. Highway efficiency improves to ~8.5 L/100km (~33 mpg UK). Track use significantly increases consumption. Aggressive driving and short trips reduce economy due to turbo and emissions system demands.
Yes. The 939 A9.000 is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. Regular inspection of the chain tensioner and guides is critical to prevent catastrophic failure.
Alfa Romeo specifies SAE 0W-40 C3 oil meeting Fiat 9.55535-S3 specification. Oil must be changed every 12,000 km or annually. Using correct oil is vital for MultiAir system longevity, turbo lubrication, and preventing sludge buildup in high-temperature zones.
Comprehensive technical documentation and regulatory references
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ALFA-ROMEO Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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.
GOV.UK: Vehicle Approval
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