The Alfa Romeo AR 31010 is a 1,750 cc, inline — four naturally aspirated petrol engine produced between 2015 and 2018. It belongs to the Tigershark family, developed under Fiat Global Small Engine (GSE) architecture, and features MultiAir II variable valve timing, port fuel injection, and dual overhead camshafts. In standard tune it delivers 88 kW (120 PS), with torque output of 162 Nm, primarily used in entry — level Giulietta and MiTo variants.
Fitted to the 940 Giulietta…
All production years (2015–2018) meet Euro 5 standards; select 2017–2018 units comply with early Euro 6b requirements depending on market .
The Alfa Romeo AR 31010 is a 1,750 cc inline-four naturally aspirated petrol engine engineered for compact transverse applications (2015–2018). It combines MultiAir II variable valve timing with port fuel injection to deliver linear throttle response and efficient urban performance. Designed to meet Euro 5 emissions standards, it balances cost-effective ownership with everyday usability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,750 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 86.0 mm × 75.0 mm | |
Power output | 88 kW (120 PS) @ 6,250 rpm | |
Torque | 162 Nm @ 4,500 rpm | |
Fuel system | Bosch ME7.8.10 port injection (up to 4 bar) | |
Emissions standard | Euro 5 (all); select markets Euro 6b | |
Compression ratio | 10.8:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven (single-row, front-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 128 kg |
The Alfa Romeo AR 31010 was used across Alfa Romeo's 940/334 platforms with transverse mounting and shared with select Fiat Chrysler Automobiles models for European applications. This engine received platform-specific adaptations-shorter intake runners in the MiTo and revised exhaust routing in the Giulietta-and from 2016 the facelifted Giulietta received the AR 31010.TU variant with updated intake manifold and ECU calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The AR 31010 delivers reliable performance and good efficiency, but early models (2015-2015) had reliability concerns, particularly MultiAir II actuator failure. Later revisions (post-2016) improved actuator durability and ECU calibration, so well-maintained examples can be robust. Regular servicing with correct oil (5W-30 Alfa Romeo M1) and 95 RON fuel greatly enhances longevity.
The most documented issues are MultiAir II actuator degradation, port injector coking, and lambda sensor degradation. Secondary concerns include timing chain tensioner wear on pre-2016 units and occasional ECU adaptation faults. These are confirmed in Alfa Romeo technical bulletins and field service reports.
This 1.8L naturally aspirated petrol is used in compact Alfa Romeo models. It powers the Giulietta (120 HP) and MiTo (120 HP). Fiat also adopted it for the Bravo. Compliance varies: all are Euro 5, with select 2017–2018 units meeting early Euro 6b requirements.
Aftermarket ECU tuning is common on the AR31010 platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
Moderate. In a Giulietta 120 HP (88 kW), combined consumption is ~7.0 L/100km (~40 mpg UK). Real-world urban driving may see 8–9 L/100km (~31–35 mpg UK), while highway cruising can achieve ~5.6 L/100km (~50 mpg UK). Fuel quality (minimum 95 RON) directly impacts efficiency.
Yes. The AR 31010 is an interference engine. If the timing chain fails or jumps, pistons will contact open valves, resulting in severe internal damage. Chain maintenance is critical—any cold-start rattle should be investigated immediately to prevent costly repairs.
Alfa Romeo specifies SAE 5W-30 oil meeting Alfa Romeo 9.55535-S1 M1 specification. This low-viscosity, high-thermal-stability oil is essential for timing chain lubrication and valve train protection. Change intervals should not exceed 15,000 km or 1 year to maintain engine health and prevent coking.
Comprehensive technical documentation and regulatory references
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Official guidance on engine swaps and inspection implications.
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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.
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