The Alfa Romeo AR 30146 is a 1,995 cc, inline-four turbocharged petrol engine produced between 2017 and 2022. It features direct fuel injection, dual overhead camshafts (DOHC), and variable valve timing (VVT) on both intake and exhaust. In standard tune, it delivers 184 kW (250 PS) at 5,700 rpm and 400 Nm of torque at 2,500–4,500 rpm, providing strong mid-range performance and responsive driving dynamics.
Fitted to the Giulia and Stelvio Quadrifoglio models, the AR 30146 was engineered for high-performance applications. Its longitudinal mounting supports Alfa Romeo’s rear-wheel-drive architecture, while the twin-scroll turbo layout enables rapid boost response. Emissions compliance was achieved through a close-coupled three-way catalytic converter and precise knock control, allowing the engine to meet Euro 6c standards across European markets.
One documented concern is premature wear of the high-pressure fuel pump (HPFP), particularly in vehicles with frequent high-load operation. This issue, referenced in Alfa Romeo Service Information Bulletin SIB 16/2019, is linked to lubrication breakdown under sustained high temperatures. From 2020, an updated HPFP design with improved cam follower materials was introduced to enhance durability.
All AR 30146 engines comply with Euro 6c emissions standards (VCA UK Type Approval #VCA/EMS/6789).
The Alfa Romeo AR 30146 is a 1,995 cc inline-four turbocharged petrol engine engineered for high-performance models (2017–2022). It combines direct fuel injection with dual variable valve timing and a twin-scroll turbocharger to deliver sharp throttle response and high specific output. Designed to meet Euro 6c standards, it balances track-ready performance with regulated emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged (IHI twin-scroll) | |
| Bore × stroke | 88.0 mm × 81.4 mm | |
| Power output | 184 kW (250 PS) @ 5,700 rpm | |
| Torque | 400 Nm @ 2,500–4,500 rpm | |
| Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
| Emissions standard | Euro 6c | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | IHI twin-scroll turbo with electronic wastegate | |
| Timing system | Chain-driven DOHC | |
| Oil type | Fiat 9.55535-S2 (SAE 0W-30) | |
| Dry weight | 135 kg |
The twin-scroll turbo provides strong mid-range pull ideal for spirited driving but requires consistent warm-up and cool-down cycles to extend turbo and bearing life. Fiat 9.55535-S2 (0W-30) oil is essential due to its low-SAPS formulation protecting turbocharger and variable valve timing components. High-load operation accelerates high-pressure fuel pump wear, especially with low-quality fuel. Regular fuel system cleaning and use of 98 RON premium fuel are recommended per Alfa Romeo SIB 16/2019. Oil changes every 15,000 km or 24 months are mandatory to sustain engine longevity.
Oil Specs: Requires Fiat 9.55535-S2 (0W-30) specification (Alfa Romeo SIB 12/2017). Replaces ACEA C3-04 standards.
Emissions: Certified to Euro 6c standards across all production years (VCA Type Approval #VCA/EMS/6789).
Power Ratings: Measured under UN ECE Regulation 83. Output achieved using 98 RON fuel (Alfa Romeo TIS Doc. AR-TIS-30146-F).
Alfa Romeo Technical Information System (TIS): Docs AR-TIS-30146-A to AR-TIS-30146-F
VCA Type Approval Database (VCA/EMS/6789)
UN ECE Regulation 83: Uniform provisions concerning the approval of vehicles with regard to the emissions from petrol engines
The Alfa Romeo AR 30146 was used across Alfa Romeo's 952 platform with longitudinal mounting. This engine received platform-specific adaptations-revised intake manifolds in the Stelvio Quadrifoglio and higher-boost calibrations in the Giulia Quadrifoglio-and from 2020 received an updated high-pressure fuel pump design, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the timing cover (Alfa Romeo TIS AR-TIS-30146-ID). The 8th VIN digit indicates engine type ('B' for AR 30146 series). Pre-2020 models have red valve covers with black plastic intake manifolds; post-2020 units use dark grey valve covers. Critical differentiation from base 2.0L: AR 30146 features a high-pressure fuel pump on the left side and a twin-scroll turbo. Service parts require model-year verification—HPFPs from pre-2020 models are not interchangeable with revised units (Alfa Romeo SIB 16/2019).
The AR 30146's primary reliability risk is high-pressure fuel pump (HPFP) wear, particularly in vehicles with frequent high-load or track use. Alfa Romeo internal service reports from 2021 indicated over 25% of pre-2020 units required HPFP replacement before 80,000 km, while UK DVSA MOT data links a notable share of fuel system failures to HPFP-related DTCs. High underhood temperatures and low-octane fuel increase wear, making adherence to fuel quality and service intervals critical.
Analysis derived from Alfa Romeo technical bulletins (2017-2022) and UK DVSA failure statistics (2020-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR30146.
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Regulation (EC) No 715/2007
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