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) Quadrifoglio, the 939 A9.000 was engineered for high-performance applications with track-capable dynamics. Emissions compliance is achieved through integrated exhaust manifolds, cooled EGR, and dual three-way catalytic converters, enabling Euro 6c compliance across its production run.
One documented update occurred in 2019, where revised engine control calibration improved throttle response and thermal management. This update, detailed in Alfa Romeo Technical Bulletin 84/2019, optimized intake timing and turbo boost curves for improved high-RPM power delivery and reduced intake temperatures.
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 twin-turbo MultiAir II system delivers rapid throttle response and high specific output, but requires strict adherence to 12,000 km oil change intervals using Fiat 9.55535-S3 specification oil to prevent hydraulic actuator degradation. Turbocharger longevity depends on proper warm-up and cool-down procedures; immediate shutdown after track use increases oil coking risk. Direct injection contributes to intake valve coking, necessitating periodic induction cleaning. Post-2019 models benefit from revised ECU calibrations and improved cooling per Technical Bulletin 84/2019. Emissions systems require periodic DTC monitoring to prevent catalyst efficiency faults.
Oil Specs: Requires SAE 0W-40 C3 meeting Fiat 9.55535-S3 specification (Alfa Romeo SIB 84/2019).
Emissions: Euro 6c certification applies to all 939 A9.000 models (2016–2023) (VCA Type Approval #VCA/EMS/5679).
Power Ratings: Measured under ECE R85 standards. 191 kW output requires premium 98 RON fuel (Alfa Romeo TIS Doc. A939PWR).
Alfa Romeo Technical Information System (TIS): Docs A939M2, A939T2, A939FI, SIB 84/2019
VCA Type Approval Database (VCA/EMS/5679)
European Commission Regulation (EC) No 715/2007
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.
Locate the engine code stamped on the front face of the cylinder block near the starter motor (Alfa Romeo TIS A939ID2). The 8th VIN digit indicates engine type ('C' for 939 series high-output). All units have a black valve cover with red accents and twin turbochargers mounted on both sides. Critical differentiation from 939 A5.000: The 939 A9.000 uses twin turbos and higher-output calibration. Service parts require model-year verification—turbochargers and ECUs before 2019 are not compatible with post-update revisions per Technical Bulletin 84/2019.
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.
Find answers to most commonly asked questions about ALFA-ROMEO 939A9000.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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