The Peugeot XW3S is a 1,124 cc, inline‑four petrol engine produced between 1983 and 1988. It features a single overhead camshaft (SOHC) and two valves per cylinder, delivering modest outputs suitable for its era. Equipped with a carburettor for fuel delivery, it prioritised simplicity and cost — effective manufacturing, producing approximately 45 kW (61 PS) and 88 Nm of torque.
Fitted primarily to the Peugeot 205 and 104 models, the XW3S was engineered for urban mobility…
Production years 1983–1988 meet pre-Euro emissions standards as per applicable French and EU regulations of the time (UTAC Type Approval records).
The Peugeot XW3S is a 1,124 cc inline‑four petrol engine engineered for supermini applications (1983-1988). It combines a simple SOHC valvetrain with carburetted fuel delivery to deliver adequate urban performance and fuel economy. Designed to meet the emissions standards of its era, it prioritises mechanical simplicity and reliability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,124 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 70.0 mm × 73.0 mm | |
Power output | 45 kW (61 PS) @ 5,800 rpm | |
Torque | 88 Nm @ 3,000 rpm | |
Fuel system | Solex 32/32 DIDTA carburettor | |
Emissions standard | Pre-Euro (1980s French/EU) | |
Compression ratio | 9.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven camshaft | |
Oil type | Mineral 15W-40 (API SF/CC) | |
Dry weight | 95 kg |
The Peugeot XW3S was used across Peugeot's supermini platforms with transverse mounting. This engine received minor platform-specific adaptations-primarily in ancillary bracketry and exhaust routing between the 104 and 205-but remained fundamentally interchangeable. All adaptations are documented in OEM technical bulletins.
The XW3S's primary reliability consideration is carburettor maintenance, with elevated incidence of running issues in neglected examples. Peugeot service data indicates that a majority of drivability complaints for this engine family stem from carburettor faults or ignition system wear. Regular adjustment and using clean fuel make long-term ownership straightforward.
Analysis derived from Peugeot technical bulletins (1983-1988) and owner club maintenance logs. 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, the XW3S is fundamentally a robust and simple engine. Its long-term reliability heavily depends on consistent maintenance, particularly of the carburettor and ignition system. With proper care, including regular oil changes and timely replacement of wear items, it can easily exceed 200,000 km.
The most frequent issues are carburettor-related (hesitation, stalling), ignition system failures (points, condenser), and minor oil or coolant leaks from aged gaskets and hoses. These are well-documented in Peugeot service literature and are generally inexpensive to fix.
The XW3S was primarily used in the Peugeot 104 (ZS/Z models from 1983-1988) and the early Peugeot 205 (Phase I GR and XR models from 1983-1987). It was the base 1.1-litre petrol engine for these popular superminis.
Modest gains are possible. Common upgrades include fitting a performance air filter, re-jetting the carburettor, and installing a free-flow exhaust. Significant power increases are difficult without major internal modifications, which are often not cost-effective for this engine.
Excellent for its time. In a Peugeot 205, expect around 6.5 L/100km (43 mpg UK) combined in real-world driving. The lighter 104 could achieve slightly better figures, often in the 5.5-6.0 L/100km (47-51 mpg UK) range under careful driving conditions.
No. The XW3S is a non-interference engine. If the timing chain were to break, the pistons and valves would not collide, preventing catastrophic internal damage. This is a significant safety feature for an older engine design.
Peugeot originally specified a mineral 15W-40 oil meeting API SF/CC standards. For a well-maintained, older engine, a high-quality mineral or semi-synthetic 15W-40 or 10W-40 is still suitable. Always consult your specific owner's manual for recommendations.
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)
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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.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
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