The Nissan CA18S is a 1,809 cc, inline‑four naturally aspirated petrol engine produced between 1983 and 1989. It features a cast iron block, aluminum cylinder head, single overhead camshaft (SOHC), and a two — barrel carburetor. This engine was designed for durability and smooth operation in Nissan's compact and mid — size vehicles of the era.
Fitted to models such as the S12 200SX, A10 Bluebird, and U11 Bluebird, the CA18S was engineered for reliable, economical transpor…
Nissan
Production years 1983–1989 meet applicable Japanese and European emissions standards for their respective model years (VCA UK Type Approval data for imported models).
The Nissan CA18S is a 1,809 cc inline‑four naturally aspirated petrol engine engineered for compact and mid‑size sedans and coupes (1983-1989). It combines a durable cast iron block with a simple SOHC valvetrain and carbureted fuel delivery to deliver smooth, reliable performance. Designed to meet the emissions standards of its era, it prioritizes longevity and ease of maintenance over high output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,809 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 83.0 mm × 83.6 mm | |
Power output | 72–77 kW (97–104 PS) | |
Torque | 142–147 Nm @ 3,200 rpm | |
Fuel system | Hitachi two-barrel downdraft carburetor | |
Emissions standard | Pre-Euro (Meets 1980s Japanese/European standards) | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven SOHC | |
Oil type | SAE 10W-40 (Mineral or Semi-Synthetic) | |
Dry weight | 135 kg |
The Nissan CA18S was used across Nissan's A10/U11/S12 platforms with longitudinal mounting. This engine received platform-specific adaptations-carburetor jetting for different altitudes in the U11 and revised engine mounts in the S12-creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
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The CA18S's primary reliability risk is camshaft and rocker arm wear, with elevated incidence in high-mileage engines or those with poor maintenance. Nissan workshop data indicates this is a frequent cause of valve train noise and reduced performance in neglected engines, while owner reports often cite carburetor issues as a secondary concern. Infrequent oil changes and the use of incorrect oil viscosity make adherence to the factory service schedule critical.
Analysis derived from Nissan technical bulletins (1985-1990) and aggregated owner workshop data (1983-2023). 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
The CA18S is renowned for its mechanical durability and can easily surpass 300,000 km with proper care. Its main weakness is the valvetrain, which requires strict adherence to oil change intervals. Neglecting maintenance, especially oil changes and valve adjustments, is the primary cause of premature failure.
The most frequent issues are wear on the camshaft and rocker arms, carburetor malfunctions (hesitation, flooding), and the need for periodic valve clearance adjustments. Cooling system leaks from aging hoses and the water pump are also common as the engine ages.
The CA18S was primarily used in the Nissan Bluebird (A10 and U11 generations), the S12 200SX, and the T11 Stanza. It was a mainstay in Nissan's mid-size lineup throughout the 1980s, powering various trim levels in these popular models.
Yes, but gains are modest. Popular upgrades include a performance carburetor, a free-flow exhaust, and a mild camshaft. Significant power increases usually require converting to fuel injection (e.g., CA18DE head) or forced induction, which is complex and costly.
Fuel economy is moderate for its era. Expect around 8.5–9.5 L/100km (30–28 mpg UK) in combined driving for a typical Bluebird or 200SX. Economy is highly dependent on the carburetor's condition and driving style, with well-maintained examples performing best.
No. The CA18S is a non-interference engine. If the timing chain fails or skips, the pistons will not contact the valves. This design makes it much more forgiving of timing component failures, though a broken chain will still leave you stranded.
Nissan recommends SAE 10W-40 mineral or semi-synthetic oil. Full synthetic oils, while generally superior, may not provide the necessary film strength for the older valvetrain design. Changing the oil and filter every 5,000–7,500 km is crucial for longevity.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
NISSAN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
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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