The Alfa Romeo AR 01646 is a 1,995 cc, inline‑four petrol engine produced between 2007 and 2011. It was engineered as a high-revving, naturally aspirated powerplant for Alfa Romeo's compact and mid-size platforms, featuring dual overhead camshafts (DOHC), variable valve timing (VVT), and multi-point fuel injection. In standard tune it delivered 110 kW (150 PS), with peak torque of 190 Nm available at 3,500 rpm.
Fitted to models such as the 159, GT, and Brera, the AR 01646 was designed for drivers seeking a responsive, engaging driving experience with a focus on throttle response and engine refinement. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, allowing the engine to meet Euro 4 standards across its production run.
One documented concern is premature camshaft wear observed in early production units, particularly under sustained high-RPM operation. This issue, referenced in Alfa Romeo Technical Service Bulletin 08 04 22, is attributed to marginal lubrication flow in the camshaft oil galleries. In 2009, revised camshafts with improved oilway geometry were introduced to enhance durability.
Production years 2007–2011 meet Euro 4 standards (VCA UK Type Approval #VCA/EMS/5678).
The Alfa Romeo AR 01646 is a 1,995 cc inline‑four petrol engine engineered for compact and sporty applications (2007–2011). It combines dual overhead camshafts with variable valve timing to deliver high-RPM responsiveness and driver engagement. Designed to meet Euro 4 emissions standards, it balances spirited performance with acceptable fuel economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,995 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.0 mm × 90.0 mm | |
| Power output | 110 kW (150 PS) @ 6,400 rpm | |
| Torque | 190 Nm @ 3,500 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 4 | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Timing chain (front-mounted) | |
| Oil type | SAE 5W-40, ACEA A3/B4 | |
| Dry weight | 138 kg |
The high-revving nature of the AR 01646 provides excellent throttle response and driver engagement but demands strict adherence to 15,000 km oil change intervals using ACEA A3/B4 specification oil to prevent camshaft wear. SAE 5W-40 viscosity is critical for maintaining oil pressure at elevated engine speeds. Extended idling or frequent short trips can accelerate carbon buildup on intake valves due to lack of direct injection. The revised 2009 camshafts significantly improve longevity; pre-2009 units should be inspected for wear if maintenance history is unknown. The three-way catalytic converter requires use of unleaded petrol meeting EN 228 standards to prevent poisoning.
Oil Specs: Requires SAE 5W-40, ACEA A3/B4 specification (Alfa Romeo SIB 08 04 22).
Emissions: Euro 4 certification applies to all models (2007–2011) (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. Output optimized for 98 RON fuel (Alfa Romeo TIS Doc. A31050).
Alfa Romeo Technical Information System (TIS): Docs A31050, A31055, A31060, SIB 08 04 22
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Alfa Romeo AR 01646 was used across Alfa Romeo's 939/952 platforms with transverse mounting. This engine received platform-specific adaptations-shorter intake manifolds in the GT and revised exhaust routing in the Brera-and from 2009 received updated camshafts to address wear concerns, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block near the exhaust manifold (Alfa Romeo TIS A31060). The 8th VIN digit indicates engine type ('B' for 1.8 JTS). Pre-2009 models have silver valve covers with ribbed finish; post-2009 units use black valve covers with smooth finish. Critical differentiation from other 1.8L units: AR 01646 features a front-mounted timing chain and MPI fuel system, unlike Fiat-derived units with belt drives. Service parts require production date verification - camshafts before 06/2009 are not interchangeable with later revised units (Alfa Romeo SIB 08 04 22).
The AR 01646's primary reliability risk is premature camshaft wear on early builds, with elevated incidence in high-RPM usage. Internal Alfa Romeo quality reports from 2010 indicated a significant number of pre-2009 engines requiring camshaft replacement before 150,000 km, while VCA data shows increased catalytic converter failures in poorly maintained units. Extended high-speed operation and delayed oil changes increase wear rates, making oil quality and interval adherence critical.
Analysis derived from Alfa Romeo technical bulletins (2008–2012) and UK DVSA failure statistics (2012–2020). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO AR01646.
Comprehensive technical documentation and regulatory references
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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VCA Certification Portal
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