The Alfa Romeo 670 05 0436 is a 1,750 cc, inline-four turbocharged petrol engine produced between 2015 and 2020. It forms part of the Fiat Global Small Engine (GSE) family, known internally as the "TwinAir Turbo" evolution, featuring multi-point fuel injection and variable valve timing (Dual VVT). In standard tune, it delivers 121 kW (165 PS) and 240 Nm of torque, designed for responsive urban and highway performance.
Fitted to models such as the Giulietta Quadrifoglio Verde, MiTo GTA, and selected 144-series derivatives, the 670 05 0436 was engineered for sporty driving dynamics and improved fuel efficiency over previous naturally aspirated units. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, enabling Euro 6 certification across all production years.
One documented concern involves premature turbocharger wastegate actuator sticking, noted in Alfa Romeo Technical Bulletin 60/17. This issue arises from carbon buildup and thermal stress on the vacuum-operated linkage, leading to boost control faults. Later production revisions (post-2018) incorporated a revised actuator design with improved sealing and thermal resistance.
Production years 2015–2020 meet Euro 6 emissions standards (VCA UK Type Approval #VCA/EMS/5678).
The Alfa Romeo 670 05 0436 is a 1,750 cc inline-four turbocharged petrol engine engineered for compact and performance hatchbacks (2015–2020). It combines multi-point fuel injection with dual variable valve timing to deliver responsive mid-range power and agile throttle response. Designed to meet Euro 6 standards, it balances spirited performance with modern emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,750 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 84.0 mm × 78.0 mm | |
| Power output | 121 kW (165 PS) @ 5,500 rpm | |
| Torque | 240 Nm @ 2,000–4,500 rpm | |
| Fuel system | Multi-point fuel injection (MPI) | |
| Emissions standard | Euro 6 | |
| Compression ratio | 9.8:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single BorgWarner turbo with vacuum-actuated wastegate | |
| Timing system | Timing chain (integrated into cylinder head) | |
| Oil type | SAE 5W-40, ACEA A3/B4 | |
| Dry weight | 128 kg |
The turbocharged design provides strong mid-range pull ideal for spirited driving but requires consistent use of 95 RON (or higher) fuel to prevent knock and maintain turbocharger efficiency. ACEA A3/B4 5W-40 oil is essential to support high-temperature stability and timing chain lubrication. Extended idle periods and short trips can accelerate carbon buildup on the wastegate actuator, leading to boost fluctuations. Post-2018 models feature an updated actuator with improved thermal resistance; pre-2018 units should be inspected per Alfa Romeo SIB 60/17. The MPI system is less sensitive to fuel quality than direct injection but still benefits from periodic injector cleaning to maintain throttle response.
Oil Specs: Requires SAE 5W-40, ACEA A3/B4 specification (Alfa Romeo SIB 60/17). Compatible with Fiat 9.55535-S1.
Emissions: Euro 6 certification applies to all production years (2015–2020) (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under ECE R85 standards. Output assumes 95 RON fuel (Alfa Romeo TIS Doc. A670-0436).
Alfa Romeo Technical Information System (TIS): Docs A670-0436, SIB 60/17
VCA Type Approval Database (VCA/EMS/5678)
European Commission Regulation (EC) No 715/2007
The Alfa Romeo 670 05 0436 was used across Alfa Romeo's 940/952 platforms with transverse mounting. This engine received platform-specific adaptations-shorter intake manifolds in the MiTo and revised engine mounts in the Giulietta-and from 2018 the facelifted Giulietta models adopted a revised turbo actuator, 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 transmission bellhousing (Alfa Romeo TIS A670-0436). The 8th VIN digit indicates engine type ('B' for 1.8 Turbo GSE). Pre-2018 models have a black plastic turbo actuator linkage; post-2018 units use a sealed metallic actuator housing. Critical differentiation from non-turbo GSE: presence of intercooler piping and boost pressure sensor. Service parts require model-year verification—turbo actuators before 2018 are not compatible with later revisions (Alfa Romeo SIB 60/17).
The 670 05 0436's primary reliability risk is turbocharger wastegate actuator failure, with elevated incidence in urban driving cycles. Internal Alfa Romeo field reports from 2019 indicated a notable share of pre-2018 units required actuator replacement before 100,000 km, while VCA MOT data links a significant portion of emissions failures to lambda sensor degradation in high-mileage examples. Frequent short trips and low-speed operation increase carbon accumulation on the actuator, making regular highway runs and proper warm-up cycles critical.
Analysis derived from Alfa Romeo technical bulletins (2015–2020) and UK DVSA failure statistics (2018–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ALFA-ROMEO 670050436.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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