The Alfa Romeo AR 36101 is a 1,742 cc, inline‑four naturally aspirated petrol engine produced between 2005 and 2010. It features dual overhead camshafts (DOHC), 16 valves, and variable valve timing (VVT) on the intake camshaft. In standard form it delivered 95 kW (129 PS) at 6,300 rpm and 162 Nm of torque at 4,000 rpm, offering responsive urban drivability with modest fuel consumption.
Fitted primarily to the Alfa Romeo 147 and Alfa Romeo GT—specifically the 1.8 TS variants…
All production years (2005–2010) meet Euro 4 emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Alfa Romeo AR 36101 is a 1,742 cc inline‑four naturally aspirated petrol engine engineered for compact sporty models (2005–2010). It combines DOHC architecture with variable valve timing to deliver responsive throttle response and linear power delivery. Designed to meet Euro 4 emissions standards, it balances spirited driving character with acceptable fuel economy for its era.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,742 cc | |
Fuel type | Petrol (Unleaded) | |
Configuration | Inline‑4, DOHC, 16‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 83.0 mm × 80.4 mm | |
Power output | 95 kW (129 PS) @ 6,300 rpm | |
Torque | 162 Nm @ 4,000 rpm | |
Fuel system | Bosch Motronic ME7.3.1 multi-point injection | |
Emissions standard | Euro 4 | |
Compression ratio | 10.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven DOHC with VVT (intake only) | |
Oil type | SAE 5W‑40, ACEA A3/B4 (Alfa Romeo 9.55535‑M2) | |
Dry weight | 138 kg |
The Alfa Romeo AR 36101 was used across Alfa Romeo's 147 and GT platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced engine mounts in the GT for torsional rigidity and revised intake manifolds in post‑2006 147 Lusso models—and from 2008 minor ECU updates improved cold-start emissions, creating minor calibration differences. All adaptations are documented in OEM technical bulletins.
The AR 36101's primary reliability risk is VVT solenoid failure, with elevated incidence in high-mileage or infrequently serviced vehicles. Alfa Romeo internal data (2008) indicated ~18% of pre-2008 engines required solenoid replacement before 100,000 km, while UK DVSA MOT records show minimal emissions-related failures due to robust catalytic design. Extended oil change intervals and low-quality oil accelerate solenoid clogging, making adherence to service schedules critical.
Analysis derived from Alfa Romeo technical bulletins (2005–2010) and UK DVSA failure statistics (2010–2023). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The AR 36101 is generally robust if maintained properly. Early models (2005–2007) are prone to VVT solenoid issues, but post-2008 revisions improved reliability. Regular oil changes with correct 5W-40 ACEA A3/B4 oil and timely ignition component replacement ensure longevity beyond 200,000 km.
Top issues include VVT solenoid failure, ignition coil wear, plastic coolant flange cracking, and exhaust manifold stud breakage. These are well-documented in Alfa Romeo service bulletins 01‑08‑2007 and 03‑11‑2008, with updated parts available for all known concerns.
The AR 36101 was used exclusively in the Alfa Romeo 147 (2005–2010) and Alfa Romeo GT (2005–2010), both in 1.8 TS trim. No cross-manufacturer applications exist. All variants comply with Euro 4 emissions standards per VCA Type Approval #VCA/EMS/5678.
Yes. ECU remapping typically yields +10–15 kW safely. The engine responds well to induction and exhaust upgrades. Forced induction is possible but requires internal reinforcement. Most owners achieve 145–150 PS reliably with stage 1 tuning and proper fuelling.
In a 147 1.8 TS, expect ~9.5 L/100km (city), ~6.2 L/100km (highway), or ~33 mpg UK combined. Real-world mixed driving typically returns 28–35 mpg UK. Economy suffers if VVT or ignition faults are present.
No. The AR 36101 is a non-interference engine. If the timing chain fails or jumps, piston-to-valve contact will not occur, significantly reducing the risk of catastrophic internal damage.
Alfa Romeo specifies SAE 5W‑40 synthetic oil meeting ACEA A3/B4 and internal standard 9.55535‑M2. Always use high-quality oil and change every 10,000–15,000 km to protect the VVT system and timing components.
Comprehensive technical documentation and regulatory references
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ALFA-ROMEO Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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)
UK type-approval authority for automotive products.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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