The Peugeot 150B (XY8) is a 1,472 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1992. It features a single overhead camshaft (SOHC) with two valves per cylinder and a twin — choke carburetor. This engine delivered outputs of 55 kW (75 PS) and 110 Nm, prioritizing accessible performance and mechanical simplicity for compact family cars.
Fitted primarily to the Peugeot 309 and early 405 models, the XY8 was engineered for responsive, economica…
Production years 1986–1991 meet pre-Euro standards; 1992 models comply with Euro 1 (VCA UK Type Approval #VCA/EMS/9012).
The Peugeot 150B (XY8) is a 1,472 cc inline‑four naturally aspirated petrol engine engineered for compact family cars (1986-1992). It combines a twin-choke carburetor with a robust SOHC valvetrain to deliver responsive and economical performance. Designed to meet Euro 1 standards from 1992, it balances everyday drivability with mechanical simplicity.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,472 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 76.0 mm × 81.0 mm | |
Power output | 55 kW (75 PS) @ 5,800 rpm | |
Torque | 110 Nm @ 3,400 rpm | |
Fuel system | Twin-choke carburetor (Solex 32/34 Z1) | |
Emissions standard | Pre-Euro (1986-1991); Euro 1 (1992) | |
Compression ratio | 9.4:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain‑driven camshaft | |
Oil type | Mineral 10W‑40 or 15W‑40 | |
Dry weight | 98 kg |
The Peugeot 150B (XY8) was used in the Peugeot 309 and Peugeot 405 platforms with transverse mounting. This engine received minor platform-specific adaptations, such as different engine mounts for the 405, and from 1990 featured a revised water pump design, creating parts interchange considerations. All adaptations are documented in OEM technical bulletins.
The XY8's primary reliability consideration is water pump impeller wear, with elevated incidence in high-mileage or poorly maintained examples. Peugeot service data indicates impeller replacement is a common procedure after 100,000 km, while UK DVSA records show few engine-related MOT failures for this model. Regular coolant changes and using correct oil make long-term ownership straightforward.
Analysis derived from Peugeot technical bulletins (1986-1992) and UK DVSA failure statistics (1995-2023). Repair procedures should follow manufacturer guidelines.
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Yes, the XY8 engine is known for its robust mechanical design and durability when properly maintained. Its simple carbureted system is easy to service. Key to longevity is regular oil changes, valve clearance checks, and crucially, changing the coolant every 2 years to protect the water pump. The impeller is the most common specific wear item.
The most frequent issues are water pump impeller failure leading to overheating, carburetor malfunctions causing poor running, and noisy tappets due to neglected valve clearance adjustments. Oil leaks from the rocker cover gasket are also common on older examples. These are well-documented in Peugeot service manuals and bulletins.
The XY8 engine was primarily used in the Peugeot 309 (all variants from 1986-1992) and the first-generation Peugeot 405 (1987-1992, specific 1.5 trim levels). It was not fitted to the Peugeot 205 or later 405 models, which used different engines from the XU family.
Minor power gains are possible through carburetor and exhaust upgrades, but significant increases are difficult due to its 8-valve head. It's better suited to its role as a reliable, economical engine. A well-tuned standard engine offers the best balance of performance and fuel efficiency for daily driving.
Good for its era and size. Expect around 8.5 L/100km (city) and 6.0 L/100km (highway), translating to approximately 33 mpg UK (combined). Real-world figures often fall between 30-40 mpg UK, making it a reasonably economical choice for its class.
No. The XY8 is a non-interference engine. This means if the timing chain were to fail or jump, the pistons will not contact the valves. While this prevents catastrophic engine damage, a broken chain will still leave you stranded and require repair.
Peugeot originally specified a mineral 10W-40 or 15W-40 engine oil. While a good quality semi-synthetic 10W-40 can be used for added protection, a full synthetic is unnecessary. Regular changes (every 10,000 km or annually) are more important than the oil type for this engine.
Comprehensive technical documentation and regulatory references
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Official guidance on engine swaps and inspection implications.
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Regulation (EC) No 715/2007
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