The Alfa Romeo AR 64307 is a 1,995 cc, inline-four turbocharged petrol engine produced between 2018 and 2022. It belongs to the Fiat Global Small Engine (GSE) Turbo family, marketed as "Turboblow" in Alfa Romeo applications. Equipped with MultiAir III variable valve actuation, gasoline direct injection, and a twin-scroll turbocharger, it produces 177 kW (240 PS) and 400 Nm of torque. This engine was engineered for high specific output and dynamic responsiveness in performance-oriented models.
Fitted to the Alfa Romeo Giulia (952) Quadrifoglio and Stelvio (956) Quadrifoglio, the AR 64307 serves as the high-performance derivative of the GSE engine line. Its design prioritizes track-capable power delivery and thermal resilience, achieving Euro 6d-TEMP compliance through a three-way catalytic converter and closed-loop lambda control with dual oxygen sensors.
One documented engineering enhancement is the integration of a forged steel crankshaft and reinforced cylinder block, as specified in Alfa Romeo Technical Bulletin 60 00 01 20. This upgrade improves durability under sustained high-RPM operation. Additionally, an enhanced oil cooling system with front-mounted heat exchanger was implemented to manage thermal loads during aggressive driving or track use.
Production years 2018–2022 meet Euro 6d-TEMP emissions standards (VCA UK Type Approval #VCA/EMS/6789).
The Alfa Romeo AR 64307 is a 1,995 cc inline-four turbocharged petrol engine designed for high-performance applications (2018–2022). It combines MultiAir III variable valve timing with gasoline direct injection and aggressive turbocharging to deliver 240 PS and 400 Nm. Built for track and spirited road use, it meets Euro 6d-TEMP standards while maintaining strong throttle response and high-RPM power delivery.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve with MultiAir III | |
| Aspiration | Turbocharged, twin-scroll | |
| Bore × stroke | 88.0 mm × 81.5 mm | |
| Power output | 177 kW (240 PS) @ 5,750 rpm | |
| Torque | 400 Nm @ 2,500–4,500 rpm | |
| Fuel system | Direct injection (up to 200 bar) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water-cooled, dual-circuit with electric thermostat | |
| Turbocharger | IHI twin-scroll turbo with electronic wastegate | |
| Timing system | Chain-driven (non-interference design) | |
| Oil type | Fiat 9.55535-S3 MOPAR S5 0W-40 | |
| Dry weight | 122 kg |
The MultiAir III system enables rapid valve control for sharp throttle response ideal for performance driving but requires strict adherence to 15,000 km oil service intervals using MOPAR S5 0W-40 to prevent hydraulic tappet clogging and turbocharger oil starvation. The lower 9.0:1 compression ratio accommodates high boost pressure but demands premium unleaded fuel (RON 98) to prevent knock. Aggressive driving without cooldown increases turbo bearing stress; the front-mounted oil cooler helps 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 60 00 01 20). Supersedes ACEA C4.
Emissions: Euro 6d-TEMP certification applies to all models 2018–2022 (VCA Type Approval #VCA/EMS/6789). No market-specific variants outside EU.
Power Ratings: Measured under UN ECE Regulation 85. Output achieved with RON 98 fuel (Alfa Romeo TIS Doc. A64307-TEST1).
Alfa Romeo Technical Information System (TIS): Docs A64307-TECH1, A64307-TECH2, SIB 60 00 01 20
VCA Type Approval Database (VCA/EMS/6789)
UN ECE Regulation 85: Power Measurement Standards
The Alfa Romeo AR 64307 was used exclusively in Alfa Romeo's 952/956 platform high-performance variants with longitudinal mounting. This engine received model-specific calibrations, including aggressive throttle mapping in the Quadrifoglio trims and enhanced cooling systems for track use. From 2018, it featured forged internals and revised turbo control per Technical Bulletin 60 00 01 20, distinguishing it from lower-output GSE units. All specifications are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right side of the cylinder block, near the exhaust manifold (Alfa Romeo TIS A64307-ID1). The 8th VIN digit indicates engine type ('T' for turbo petrol GSE units). Quadrifoglio models feature a visible red-painted cam cover and a front-mounted oil cooler. Critical differentiation from AR 64304: AR 64307 has MultiAir III actuator with updated solenoid design and uses MOPAR S5 0W-40 oil. Service parts are not interchangeable with non-Quadrifoglio engines due to reinforced internals (Alfa Romeo SIB 60 00 01 20).
The AR 64307's primary reliability risk is turbocharger actuator failure under sustained high-load conditions, with elevated incidence in track-driven vehicles. Internal Alfa Romeo field reports from 2020 indicated a measurable share of units requiring actuator replacement before 80,000 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 (2018-2022) and UK DVSA failure statistics (2019-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR64307.
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