The Fiat 138 B2.000 is a 1,995 cc inline — four petrol engine produced between 1981 and 1985. It served as a mid — range powerplant for the Fiat 138 sedan and estate, delivering 77–82 kW (105–112 PS) depending on application. Equipped with a single overhead camshaft (SOHC), 8 — valve head, and twin — choke Weber 36 DOHC carburettor, it offered improved torque and drivability over the base 1.5L unit.
Fitted to the Fiat 138 and 138 LX models, the B2.000 was engineered for balanced pe…
All B2.000-equipped Fiat 138 models comply with ECE Regulation 15 Phase II .
The Fiat B2.000 is a 1,995 cc inline-four SOHC petrol engine designed for mid-size sedans and estates (1981–1985). It combines twin-choke carburettor fuel delivery with durable iron-block construction to deliver strong mid-range performance and consistent reliability. Designed to meet ECE R15 Phase II standards, it balances drivability with serviceability for everyday use.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,995 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, SOHC, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 84.0 mm × 90.0 mm | |
Power output | 77–82 kW (105–112 PS) | |
Torque | 148–152 Nm @ 2,800 rpm | |
Fuel system | Twin-choke carburettor (Weber 36 DOHC) | |
Emissions standard | ECE R15 Phase II | |
Compression ratio | 9.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Chain-driven camshaft | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 142 kg |
The Fiat B2.000 was used across Fiat's 138 series platforms with transverse mounting and no licensed external usage. This engine received platform-specific adaptations—twin-choke Weber 36 DOHC in LX trims—and from 1983, the facelifted 138 models adopted revised EGR calibration and improved intake sealing, creating minor service part distinctions. 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 Fiat technical bulletins (1981-1985) and UK DVSA historic vehicle inspection data (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
Yes, when properly maintained. The B2.000 features a robust iron block and proven SOHC design, making it durable over time. Early models (pre-1983) may show EGR or carburettor issues, but post-1983 revisions improved reliability. Regular oil changes with correct 10W-40 mineral oil and carburettor servicing are essential for long-term operation.
Common issues include carburettor mixture drift, EGR valve clogging, oil leaks from gaskets, and timing chain wear in early models. These are documented in Fiat service literature and observed in historic vehicle inspections. Upgrading to post-1983 components and using ethanol-resistant carburettor parts can mitigate many concerns.
The B2.000 was used exclusively in the Fiat 138 range from 1981 to 1985. It powered the 138 (1.8L, 1.8 S), LX, and Panorama estate models. No other Fiat platforms used this engine, and it was not licensed to other manufacturers.
Yes, within mechanical limits. The LX variant already features a high-output tune with Weber 36 DOHC carburettor for 82 kW output. Enthusiasts often upgrade to performance camshafts, high-flow heads, and electronic ignition. However, tuning should preserve the engine's balance and avoid over-revving, as the crankshaft and rods are not designed for extreme RPM.
Moderate by modern standards. In a Fiat 138 1.8L, fuel consumption averages ~11.2 L/100km (city) and ~8.0 L/100km (highway), or approximately 25 mpg UK combined. The LX model, with higher compression and twin carburettors, may consume 10–15% more fuel under spirited driving.
No. The B2.000 uses a non-interference valve train design. If the timing chain fails or skips, the pistons will not contact the valves, preventing catastrophic internal damage. However, immediate repair is still advised to avoid secondary issues like misfires or poor compression.
Fiat specifies SAE 10W-40 mineral oil meeting API SE/CC standards. This viscosity protects the chain-driven camshaft and solid lifters effectively. Synthetic oils are not recommended unless seals are upgraded, as they may increase seepage in older gaskets. Oil should be changed every 15,000 km or annually.
Comprehensive technical documentation and regulatory references
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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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