The Peugeot BAZ (XU5CP) is a 1,580 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1992. It features a cast — iron block, an aluminium cylinder head with a single overhead camshaft (SOHC), and a two — barrel carburettor. This 8 — valve unit delivers 65 kW (88 PS) and 130 Nm of torque, with its torque curve tuned for accessible low — to — mid range power suitable for city and highway driving.
Fitted to models such as the 205, 309, and 405—including varian…
Production years 1986–1992 meet Euro 1 standards .
The Peugeot BAZ (XU5CP) is a 1,580 cc inline‑four naturally aspirated petrol engine engineered for compact hatchbacks and sedans (1986-1992). It combines a robust cast-iron block with a simple SOHC valvetrain and carburetted fuel delivery to deliver economical and reliable performance. Designed to meet Euro 1 standards, it prioritises serviceability and cost-effective ownership.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,580 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 78.5 mm × 82.0 mm | |
Power output | 65 kW (88 PS) | |
Torque | 130 Nm @ 3,000 rpm | |
Fuel system | Solex 32/34 Z1 two-barrel carburettor | |
Emissions standard | Euro 1 | |
Compression ratio | 9.2:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven | |
Oil type | PSA B71 2030 (SAE 10W‑40) | |
Dry weight | 115 kg |
The Peugeot BAZ (XU5CP) was used across PSA Group's Platform 1 and Platform 2 with transverse mounting. This engine received platform-specific adaptations-reinforced mounts in the 405 sedan and revised exhaust manifolds in the 309-with no major facelift revisions affecting core compatibility. 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.
The most common questions about engine codes, what they mean, how to find them and how this database works
The BAZ is a simple, robust engine known for its durability when properly maintained. Its main Achilles' heel is the timing belt; failure to replace it on schedule will destroy the engine. With regular oil changes, ignition system servicing, and carburettor care, these engines can easily surpass 250,000 km.
The most frequent and critical issue is timing belt failure. Other common problems include carburettor malfunctions (hesitation, stalling), ignition system wear (misfires), and coolant leaks from hoses or the water pump. These are well-documented in PSA service bulletins.
This 1.6L petrol engine was used in the Peugeot 205 (1986-1990), 309 (1986-1991), and 405 (1987-1992), typically in GR and SR trims. It was also shared with the Citroën BX (1986-1990) in the 16 RS variant.
Yes, modest gains are possible. Common upgrades include a performance exhaust, a modified distributor for more advance, and a re-jetted carburettor. More significant power increases require head work or swapping to a fuel-injected XU5 or XU9 engine. The bottom end is strong enough for mild tuning.
Official combined figures are around 7.5 L/100km (38 mpg UK), but real-world consumption is typically 8.5-10.0 L/100km (28-33 mpg UK) depending on model, driving style, and carburettor condition. Careful driving can yield better results.
Yes. The BAZ is an interference design. If the timing belt breaks or jumps, the pistons will collide with the open valves, causing severe and expensive engine damage. This makes the 60,000 km/5-year belt change interval absolutely non-negotiable.
Peugeot recommended a mineral-based 10W-40 oil meeting the PSA B71 2030 specification. Modern semi-synthetic 10W-40 oils that meet ACEA A3/B3 or A3/B4 standards are also suitable and may offer better protection.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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