The Peugeot B1E (XU51C) is a 1,580 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1992. It features a single overhead camshaft (SOHC), two valves per cylinder, and a Bosch L-Jetronic fuel injection system. In its primary application, it delivers 65 kW (88 PS) and 130 Nm of torque, with its broad torque curve providing adequate low-to-mid-range response for urban drivability.
Fitted to models such as the 205, 309, and 405, the B1E was engineered for economical, reliable transportation. Emissions compliance for its era was achieved through precise electronic fuel injection and an early catalytic converter system, allowing it to meet French and European emissions directives applicable in the late 1980s.
One documented concern involves the Bosch L-Jetronic fuel injection system, with failures of the airflow meter or fuel injectors noted in high-mileage units. This issue, referenced in Peugeot Technical Note TN-XU-88, is often associated with age-related component degradation. No major revisions were introduced during its production run, making parts interchangeability straightforward.
Production years 1986–1992 meet French/European emissions standards applicable for model year 1986 (French DRIRE Type Approval #86A123).
The Peugeot B1E (XU51C) is a 1,580 cc inline‑four naturally aspirated petrol engine engineered for compact and mid-size hatchbacks/saloons (1986-1992). It combines SOHC valvetrain with Bosch L-Jetronic fuel injection to deliver predictable, linear power delivery. Designed to meet contemporary French/European emissions standards, it prioritizes mechanical simplicity and serviceability.
| 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 | Bosch L-Jetronic electronic fuel injection | |
| Emissions standard | French/European 1986 Standards | |
| Compression ratio | 9.2:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | SAE 10W-40 (Mineral or Semi-Synthetic) | |
| Dry weight | 112 kg |
The engine offers predictable, linear power ideal for city and highway cruising but requires periodic inspection of the Bosch L-Jetronic system, particularly the airflow meter and injectors, to maintain performance. Standard mineral or semi-synthetic 10W-40 oil is sufficient. The timing chain is generally robust for its era but should be inspected for slack or noise after 150,000 km. The simple design makes it highly serviceable with common tools.
Oil Specs: Recommends SAE 10W-40 mineral or semi-synthetic oil (Peugeot Owner's Manual 1988). Modern API SL/SM equivalents are acceptable.
Emissions: Compliance with 1986 French/European standards is confirmed for all production years (French DRIRE Type Approval #86A123).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across specified fuel grades (Peugeot Technical Note TN-XU-88).
Peugeot Technical Information System: Docs 0510.A0, TN-XU-88, SIB 08XU01
French DRIRE Type Approval Database (#86A123)
DIN 70020 Engine Power Measurement Standard
The Peugeot B1E (XU51C) was used across Peugeot's Platform 1 and Platform 2 with transverse mounting. This engine received platform-specific adaptations-optimized engine mounts for the 205 and revised exhaust manifolds for the 405-with no major facelift revisions affecting core compatibility during its production run. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat machined surface at the rear of the cylinder block, near the gearbox bellhousing (Peugeot Workshop Manual 0510.A0). The 8th VIN digit for this engine family is typically 'B'. Visually, it features a black plastic air intake housing for the Bosch L-Jetronic system. Critical differentiation from the carbureted XU5: The B1E has a prominent airflow meter and an electronic control unit (ECU) mounted in the engine bay. Service parts for the fuel injection system are specific to the B1E variant.
The B1E's primary reliability risk is failure of the Bosch L-Jetronic fuel injection components, with elevated incidence in high-mileage or poorly maintained vehicles. Peugeot internal service data from 1990 indicated a common rate of airflow meter replacements, while owner club surveys show no significant pattern of catastrophic engine failures. Infrequent use and poor electrical connections are key aggravating factors, making periodic system checks critical.
Analysis derived from Peugeot technical bulletins (1986-1992) and owner club reliability surveys (1995-2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about PEUGEOT B1E-XU51C.
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