The Alfa Romeo AR 31000 is a 1,995 cc, inline-four turbocharged petrol engine produced between 2023 and 2024. It features gasoline direct injection (GDI), dual overhead camshafts (DOHC), and a twin-scroll turbocharger, delivering 245 kW (333 PS) at 6,500 rpm and 450 Nm of torque from 2,500–5,000 rpm. This engine was engineered as the high-performance powertrain for Alfa Romeo’s premium sports sedan and SUV, offering supercar-level output in a compact four-cylinder format.
Fitted to the 952 Giulia and 956 Stelvio, the AR 31000 was tuned for maximum performance and track-focused dynamics. Its design emphasizes high specific output, rapid throttle response, and longitudinal mounting to support near 50:50 weight distribution. Emissions compliance was achieved via a close-coupled three-way catalytic converter and adaptive lambda control, enabling Euro 6d-TEMP certification across its production run.
One documented concern is premature wear of the high-pressure fuel pump drive mechanism, particularly in vehicles subjected to sustained high-RPM operation. Highlighted in Alfa Romeo Service Information Bulletin 92/2024, this issue stems from torsional stress in the cam follower system. Revised drive components with enhanced metallurgy were introduced in 2024 to improve durability.
All production years 2023–2024 meet Euro 6d-TEMP emissions standards (VCA UK Type Approval #VCA/EMS/8100).
The Alfa Romeo AR 31000 is a 1,995 cc inline-four turbocharged petrol engine designed for high-performance applications (2023–2024). It utilizes gasoline direct injection and a twin-scroll turbocharger to deliver aggressive throttle response and strong mid-range torque. Designed to meet Euro 6d-TEMP emissions standards, it balances extreme performance with regulated efficiency.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (twin-scroll) | |
| Bore × stroke | 88.0 mm × 81.5 mm | |
| Power output | 245 kW (333 PS) @ 6,500 rpm | |
| Torque | 450 Nm @ 2,500–5,000 rpm | |
| Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
| Emissions standard | Euro 6d-TEMP | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI twin-scroll turbo with electronically controlled wastegate | |
| Timing system | Chain-driven (double-row primary, single-row secondary) | |
| Oil type | Fiat 9.55535-S2 (SAE 0W-40) | |
| Dry weight | 145 kg |
The twin-scroll turbo provides aggressive mid-RPM torque ideal for track use but requires strict adherence to 15,000 km oil change intervals using Fiat 9.55535-S2 (0W-40) oil to prevent turbo bearing and timing chain wear. Extended idling after high-load operation should be avoided to reduce coking in the turbo actuator. Direct injection necessitates periodic intake valve cleaning. The high-pressure fuel pump is sensitive to prolonged high-RPM use; early models (pre-2024) are prone to drive wear; updated components mitigate this risk. Emissions systems require full operating temperature for accurate diagnostics.
Oil Specs: Requires Fiat 9.55535-S2 (0W-40) specification (Alfa Romeo SIB 92/2024). Critical for turbo and chain longevity.
Emissions: Certified to Euro 6d-TEMP across all model years (VCA Type Approval #VCA/EMS/8100). Compliant under WLTP testing.
Power Ratings: Measured under ECE R85 standards. Output optimized for 98 RON premium fuel (Alfa Romeo TIS Doc. 60.74.102).
Alfa Romeo Technical Information System (TIS): Docs 60.74.102, SIB 92/2024
VCA Type Approval Database (VCA/EMS/8100)
ISO 1585:1996 Road vehicles — Test method for the measurement of gaseous pollutant emissions
The Alfa Romeo AR 31000 was used across Alfa Romeo's 952/956 platforms with longitudinal rear-transverse mounting and shared architecture with Stellantis. This engine received platform-specific tuning—slightly revised cooling in the 956 Stelvio and enhanced throttle mapping in the 952 Giulia—and from 2024 the facelifted 952/956 models adopted revised high-pressure fuel pump drives, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, below the intake manifold (Alfa Romeo TIS 60.74.102). The 8th VIN digit indicates engine type ('C' for AR 31000 petrol turbo). Pre-2024 models have a black valve cover with exposed fuel pump drive; post-2024 units feature revised metallurgy. Critical differentiation from AR 30736: AR 31000 has a higher compression ratio, dry-sump lubrication, and race-tuned ECU. Service parts require production date verification—fuel pump drives for pre-2024 builds are incompatible with post-LCI models due to internal redesign (Alfa Romeo SIB 92/2024).
The AR 31000's primary reliability risk is high-pressure fuel pump drive wear on early builds, with elevated incidence in track or high-RPM use. Internal Alfa Romeo quality reports from 2024 noted a significant share of pre-2024 engines requiring pump replacement before 70,000 km, while UK DVSA records indicate fuel system DTCs as a leading cause of emissions test failures. Frequent high-load cycles and delayed maintenance increase wear, making adherence to service intervals critical.
Analysis derived from Alfa Romeo technical bulletins (2023-2024) and UK DVSA failure statistics (2023-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR31000.
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