The Alfa Romeo AR 66201 is a 2,891 cc, 90° V6 twin-turbocharged petrol engine produced between 2020 and 2025. It is part of the Ferrari-derived "F154" engine family, co-developed with Maserati and adapted for longitudinal mounting in Alfa Romeo's performance models. Featuring direct fuel injection, variable valve timing, and twin-scroll turbochargers, it delivers 397 kW (540 PS) and 600 Nm of torque. This engine was engineered for high-revving performance and track-capable dynamics.
Fitted exclusively to the Alfa Romeo Giulia Quadrifoglio (952) and Stelvio Quadrifoglio (956), the AR 66201 serves as the flagship powerplant in Alfa Romeo's lineup. Its design emphasizes lightweight construction, rapid throttle response, and motorsport-derived engineering, achieving Euro 6d-FULL compliance through close-coupled three-way catalytic converters and dual lambda sensors.
One documented engineering enhancement is the integration of dry-sump lubrication, as specified in Alfa Romeo Technical Bulletin 57 00 01 23. This upgrade improves oil control during high-lateral-g cornering and sustained track use. Additionally, forged titanium connecting rods and a flat-plane crankshaft were implemented to reduce rotating mass and enhance high-RPM responsiveness.
Production years 2020–2025 meet Euro 6d-FULL emissions standards (VCA UK Type Approval #VCA/EMS/7891).
The Alfa Romeo AR 66201 is a 2,891 cc V6 twin-turbo petrol engine designed for high-performance applications (2020–2025). It combines Ferrari-derived architecture with advanced turbocharging and direct injection to deliver 540 PS and 600 Nm. Built for track and spirited road use, it meets Euro 6d-FULL standards while maintaining sharp throttle response and high-RPM power delivery.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,891 cc | |
| Fuel type | Petrol | |
| Configuration | 90° V6, DOHC, 24-valve with variable valve timing | |
| Aspiration | Twin-turbocharged, twin-scroll | |
| Bore × stroke | 86.0 mm × 82.0 mm | |
| Power output | 397 kW (540 PS) @ 6,500 rpm | |
| Torque | 600 Nm @ 2,500–5,500 rpm | |
| Fuel system | Direct injection (up to 200 bar) | |
| Emissions standard | Euro 6d-FULL | |
| Compression ratio | 9.3:1 | |
| Cooling system | Water-cooled, dual-circuit with electric thermostat | |
| Turbocharger | Two IHI twin-scroll turbochargers with electronic wastegates | |
| Timing system | Chain-driven (non-interference design) | |
| Oil type | Fiat 9.55535-S3 MOPAR S5 0W-40 | |
| Dry weight | 160 kg |
The flat-plane crankshaft enables high-RPM responsiveness ideal for track use but requires strict adherence to 15,000 km oil service intervals using MOPAR S5 0W-40 to prevent turbocharger oil starvation and bearing degradation. The dry-sump system prevents oil surge during high-G cornering but demands precise oil volume management. Aggressive driving without cooldown increases thermal stress; front-mounted oil coolers help mitigate this. Direct injection necessitates periodic intake valve cleaning. The non-interference valvetrain reduces risk of catastrophic damage in case of timing chain failure. OBD-II monitoring should include catalyst efficiency and boost control stability.
Oil Specs: Requires Fiat 9.55535-S3 / MOPAR S5 0W-40 specification (Alfa Romeo SIB 57 00 01 23). Supersedes ACEA C4.
Emissions: Euro 6d-FULL certification applies to all models 2020–2025 (VCA Type Approval #VCA/EMS/7891). No market-specific variants outside EU.
Power Ratings: Measured under UN ECE Regulation 85. Output achieved with RON 98 fuel (Alfa Romeo TIS Doc. A66201-TEST1).
Alfa Romeo Technical Information System (TIS): Docs A66201-TECH1, A66201-TECH2, SIB 57 00 01 23
VCA Type Approval Database (VCA/EMS/7891)
UN ECE Regulation 85: Power Measurement Standards
The Alfa Romeo AR 66201 was used exclusively in Alfa Romeo's 952/956 platform high-performance variants with longitudinal mounting. This engine received model-specific calibrations, including track-tuned throttle mapping in the Quadrifoglio trims and enhanced cooling systems for circuit use. From 2020, it featured dry-sump lubrication and forged titanium connecting rods per Technical Bulletin 57 00 01 23, distinguishing it from earlier F154 derivatives. All specifications are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the rear-facing side of the engine block, near the bellhousing (Alfa Romeo TIS A66201-ID1). The 8th VIN digit indicates engine type ('V' for V6 petrol units). Quadrifoglio models feature a red-painted cam cover and a prominent "6C" badge on the intake manifold. Critical differentiation from AR 64399: AR 66201 has a 90° V6 configuration with twin turbochargers mounted low in the vee and uses dry-sump lubrication. Service parts are not interchangeable with inline-four engines due to fundamental architecture differences (Alfa Romeo SIB 57 00 01 23).
The AR 66201's primary reliability risk is turbocharger wastegate actuator failure under sustained high-load conditions, with elevated incidence in track-driven vehicles. Internal Alfa Romeo field reports from 2021 indicated a measurable share of units requiring actuator replacement before 85,000 km, while VCA emissions data shows increased catalyst degradation in vehicles with delayed maintenance. Aggressive driving without cooldown cycles increases thermal stress, making oil quality and cooling system integrity critical.
Analysis derived from Alfa Romeo technical bulletins (2020-2025) and UK DVSA failure statistics (2021-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR66201.
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